CN1777162A - Residual sideband receiver and its carrier resetting device - Google Patents
Residual sideband receiver and its carrier resetting device Download PDFInfo
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Abstract
The invention is related to receiving signal modulated and transmitted through mode of vestigial sideband, especially to digital TV set from receiving analog signal in transmission frequency band to demodulating digital signal in base band. The TV set includes following parts: digital processing part for digitizing in certain bandwidth in middle frequency after antenna selects frequency of channel, and frequency conversion is carried out; low pass filter for the first bandwidth; the part for recovering carrier wave for extracting pilot signal from low pass filter for the second bandwidth, and for recovering signal of carrier wave in base band; clock demodulation part for clearing away pilot signal and extracting synchronizing signal; noise remover for clearing away linear noise and phase noise by using synchronizing signal; decoding part for decoding signal in base band. Advantages are: steady carrier wave recovery can be carried out even pilot signal is weak in channel.
Description
Technical field
The present invention relates to digital TV aspect, more particularly, relate to receive by vestigial sideband (Vestigial Side Band; VSB) the mode signal modulating, transmit, the residual sideband receiver of carrier resetting and carrier resetting device thereof.
Background technology
Usually, the VSB mode of the Major Leagues (Grand Alliance) that adopt as the U.S. and Korea S numeral TV (for example HDTV) load mode standard is a kind of when modulation signal, be the center with the carrier wave only to decay, the mode that the remainder during a side bandwidth signal is modulated in 2 side bandwidth of Sheng Chenging up and down.
That is the mode that only a side wave bandwidth spectrum of baseband is moved, transmits to transmission band.It is a kind of mode of efficient utilized bandwidth domain mode.
When VSB modulates, if the DC frequency spectrum of baseband (base band) is moved to transmission band (pas sband), be transformed into the tone frequency spectrum, we are called pilot signal with this signal.That is, when TV station carries out VSB when modulation, can be in order to make receiver exactly to signal demodulator, with pilot signal to aerial transmission.
Fig. 1 is the formation block diagram of common digital TV dispensing device.Randomizer (Randomizer) 101 is imported data at random, to 102 outputs of R-S encoder, R-S encoder 102 is in order to encode to inboard and outside channel, with the data R-S coding of arbitrarily input, after appending the quantity symbol such as grade of 20 bytes, to digital multiplexer 103 outputs.
Above-mentioned multiplexer 105 is according to each segment and each picture, segment synchronizing signal in the symbol of structured coding and territory synchronizing signal are mixed, after making picture, to 106 outputs of pilot tone insertion section, pilot tone insertion section 106 is with the DC value--and-pilot signal is inserted in the transmission signal of pictureization, to 107 outputs of VSB modulation portion.
Above-mentioned VSB modulation portion 107 will be inserted the symbol rank of pilot signal and modulate according to the VSB mode, to 108 outputs of RF up converter, RF up converter 108 is in order to transmit efficiently by antenna, after the VSB signal transformation of baseband of modulation become RF transmission band signal, transmit by antenna.
Fig. 2 is the detailed formation block diagram of the VSB modulation portion of the digital TV dispensing device that shows among Fig. 1.
For the signal by the channel encoder (Channel Encoder) 201 that is made of the shown randomizer 101 of Fig. 1, RS-encoder 102, digital multiplexer 103, structured coding device 104, multiplexer 105, pilot tone insertion section 106 being carried out the VSB modulation, need be by the VSB modulation portion that constitutes by composite filter 202 and intermediate frequency modulator 203.At first, for the signal by channel encoder 201 being carried out the VSB modulation, by composite filter (Complex filter) 202.At this moment, if the digital signal of coding is by composite filter 202, according to Hilbert (Hilbert) transducer and SRC, I﹠amp; The frequency pattern of Q signal is transformed into the pattern that can carry out the VSB modulation.
Output one I﹠amp for composite filter 202; Q signal, intermediate frequency modulator 203 are extracted two signals out after carrying out the intermediate frequency modulation from subtracter 204, can obtain the VSB intermediate frequency signal of needed bandwidth (6MHz).For the intermediate frequency signal of the VSB that will generate like this transmits to aerial ripple, be transformed into via RF-up converter 205, behind efficient wireless frequency (RF) the transmission band signal that transmits, transmit by antenna.
Fig. 3 is the formation block diagram of common digital TV receiving system.
Fig. 3 is the formation block diagram of the digital TV receiving system of ATSC specification, by the transmission band signal of tracker or specific channel, utilize the wide pilot signal of inserting side wavestrip, finish carrier resetting after, the baseband signal restoring signal time and the compensation channel that restore are extracted out and are sent signal.
The receiving system of the digital TV of existing technologies is made of following components: behind the channel frequency of selecting to wish by antenna 301, the VSB signal of the RF bandwidth of loading in the above-mentioned channel frequency is easy to handle in general circuit frequency bandwidth one IF bandwidth is carried out the tuner 302 of 1 downward conversion; The SAW filter 303 of certain bandwidth of the IF signal of exporting by above-mentioned tuner 302 only; The output of above-mentioned SAW filter 303 is carried out the intermediate frequency handling part 304 of 2 downward conversions at 305 li signals to hope of A/D converter section; With the digitized A/D converter section 305 of the analog output signal of intermediate frequency handling part 304; With the digital signal of A/D converter section 305 carrier resetting portion 306 to baseband signal transformation; The DC remover 307 of pilot signal in the output signal of removing carrier resetting portion 306; From the output signal of DC remover 307, extract synchronizing signal out, release signal synchronization portion 308 regularly; The channel equalizer 309 that the straight line noise of having removed in the transmission signal of DC composition is removed; The phase tracking device 310 that the residual phase noise of having removed in the transmission signal of straight line noise is removed; Carry out the FEC portion 311 of the decoding operation opposite with the digital channel coding that transmits signal sending end.
Here, tuner 302, SAW filter 303, intermediate frequency handling part 304 can be called simulation process portion.With digitized A/D converter section 305 of the analog output signal that is included in the intermediate frequency handling part 304 in the simulation process portion and the combination of simulation process portion, be called as digital processes.And DC remover 307 and synchronization portion 308 are called as clock detection section 312.Channel equalizer 309 and phase tracking device 310 are called as noise removing portion 313.
Promptly, if receive according to VSB mode modulated RF signal by antenna 301, tuner 302 uses the heterodyne method modulation system, behind the channel frequency of selecting to wish, the VSB signal that is loaded in the RF bandwidth in the above-mentioned channel frequency is reduced to fixing intermediate frequency bandwidth (IF; Usually be extensive use of 44MHz or 43.75MHz), start the channel signals that other is fit to.
And the output signal of the tuner 302 that the frequency spectrum of arbitrary channel is moved, exports to specific I F bandwidth is removed surface acoustic wave (the Surface Acoustic Wave of noise signals and simulation integration filter function by having other bandwidth signal of removing; SAW) filter 303.
At this moment, with the digital broadcast signal is example, because the bandwidth memory from the intermediate frequency of 44MHz to 6MHz is in all information, 303 in SAW filter stays the bandwidth that has the 6MHz of information in the output of tuner 302, after removing remaining whole interval, to 304 outputs of intermediate frequency handling part.
After intermediate frequency handling part 304 was transformed into the analog signal of A/D converter section 305 hope, A/D converter section 305 was transformed into digital signal with the analog signal of input.
The transmission band signal that is transformed into digital signal becomes baseband signal (BaseBand) in 306 li detections of carrier resetting portion (CarrierRecovery), transmitting terminal is for carrier detection, the frequency of inserting the pilot signal in the signal that detection becomes the baseband signal become the DC composition of 0Hz.
Here, owing to produced the DC composition, need utilize DC remover 307 to remove it.
From the output of DC remover 307, extract out and transmit the synchronizing signal that exists in the signal, from release signal synchronization portion 308 regularly, extract the information in synchronizing signal interval out.At this moment, the information in the synchronizing signal interval of generation is used in channel equalizer 309, phase tracking device 310 and the FEC311 of rear end.
Removed the signal of DC composition and removed the straight line noise that exists in the simulation part that transmits in channel and the receiver by channel equalizer 309.And, via removing the phase tracking device 310 that does not have the residual phase noise removed in the parts forwardly, in FEC portion 311, carry out the opposite decoding operation of digital channel coding with sending part.Finish this decoding operation, the effect of acceptance division is all in the digital TV, and the signal that transmitting terminal is imported to acceptance division flows (Transport Stream) and passes to video and Audio Signal Processing portion (unmarked among the figure) with identical transmission.
Fig. 4 is the detailed formation block diagram of carrier resetting portion in the digital TV receiving system that shows among Fig. 3.
In the formation of the receiving system of Fig. 3, what the more detailed block diagram of carrier resetting portion 306-Fig. 4 showed is according to the ATSC specification, constructs FPLL of the present invention (Frequency Phase Lock Loop: the general formation block diagram in the time of frequency plot locking circulation) by carrier resetting portion.
The carrier resetting of numeral TV receiving system is made of following components: to digital signal conversion, and output is turned over it and is turn 90 degrees with transmission band (PassBand) analog signal, be transformed into the Q signal of imaginary number composition after, the Hilbert transducer 402 of output; After delay becomes above-mentioned digital signal conversion processing time of Q signal of Hilbert transducer, the delayer 401 of the I signal of output real number composition; With the I of above-mentioned delayer 401 and Hilbert transducer 402, the output signal of Q output signal and voltage-controlled oscillator 410 multiplies each other, to the I of baseband, and the complex product musical instruments used in a Buddhist or Taoist mass 403 of Q signal (carrier wave) output; Pass through filter 404 by the low territory of I signal, delayer 406, symbol extractor displacer 407, multiplier 408, recursive filter 409 and voltage-controlled oscillator (VCO: course control generator, perhaps Numerical Control oscillator: NCO) 410 constitute, the FLL of the frequency of the I signal of the baseband of locking complex product musical instruments used in a Buddhist or Taoist mass 403 outputs (FrequencyLocked Loop: the frequency lock circulation) and by the low territory of Q signal pass through filter 405, multiplier 408, recursive filter 409 and voltage-controlled oscillator (VCO) 410 constitutes, the PLL of the Q signal of the baseband of locking complex product musical instruments used in a Buddhist or Taoist mass 403 outputs (Phase Locked Loop: the locking circulation mutually) FPLL that constitutes.
Here, the low territory of I signal is by filter 404 and delayer 406 and symbol extractor displacer 407 detection frequency errors (error), and the low territory of Q signal is by filter 405 detected phase error (error) from the frequency error that detects.And multiplier 408 multiplies each other the frequency error of the low territory of I signal by filter 404 and delayer 406 and symbol extractor displacer 407 with the phase error of the low territory of Q signal by filter 405, finally calculated rate and phase error composition (control voltage).
Then, recursive filter 409 is removed the high frequency composition that is included in frequency and the phase error composition, and voltage-controlled oscillator 410 is according to frequency and phase error composition (control voltage), and change concussion frequency is shaken.
That is, 409 of recursive filters carry out filtering to the baseband signal, and output, and voltage-controlled oscillator 410 is according to the output signal of recursive filter 409, the concussion frequency that output changes.Then,, change the frequency and the phase place of carrier wave, remove beat frequency (beat frequency) frequency according to the concussion frequency that voltage-controlled oscillator 410 changes.
Promptly, carrier resetting portion 306 is discrete phases from SAW filter 303 output signals, and to the I of baseband, Q signal carries out detection, locking (locking) frequency and phase place, with the centre frequency of voltage-controlled oscillator (VCO) 410 be locked as intermediate frequency (for example, 46.690559MHz), by complex product musical instruments used in a Buddhist or Taoist mass 403, with the output of VCO410 and the output multiplication of SAW filter 303, to the I of baseband, Q channel signals i (t), q (t)) detection.
At this moment, the pilot carrier frequency that inserts in the dispensing device have only the output that is present in SAW filter 303 exactly intermediate frequency (for example, 46.690559MHz) in, remaining receiving system can move normally.But generally, having many times is not 46.690559MHz accurately.
Because the output frequency of VCO410 is locked into 46.690559MHz, when the output frequency of the pilot tone of SAW filter 303 was not 46.690559MHz, there were beat frequency (beat) frequencies of difference degree of two frequencies of output in 403 li of complex product musical instruments used in a Buddhist or Taoist mass.In order to remove above-mentioned beat frequency rate, need to use FPLL.That is, by the concussion frequency of conversion VCO410, the frequency of conversion carrier wave and phase place are removed beat frequency rate.Therefore, search mobile VCO410 the concussion frequency direction and the gain be exactly the purpose of FPLL.
FPLL is the form of the circulation combination of the circulation (loop) of locking frequency (Frequency) and locking phase (phase).
In Fig. 4, by hanging down the automatic frequency control filters (AFC Filter:Auto Frequency Control Filter) that the territory is constructed by filter 404, delayer 406, symbol extractor displacer 407, multiplier 408, recursive filter 409, the circulation that VCO410 and complex product musical instruments used in a Buddhist or Taoist mass 403 constitutes forms the circulation (FLL) of locking frequency, and the circulation that is made of by filter 405, multiplier 408, recursive filter 409, VCO410 and complex product musical instruments used in a Buddhist or Taoist mass 403 low territory forms the circulation (PLL) of locking phase.
Fig. 5 a is the schematic diagram of a characteristic of the compound multiplier output signal in the carrier resetting portion that shows among Fig. 4 to Fig. 5 c.Fig. 6 a is another specific schematic diagram of the compound multiplier output signal in the carrier resetting portion that shows among Fig. 4 to Fig. 6 c.
Fig. 5 a is when receiving system stably receives pilot signal, the schematic diagram of the frequency spectrum of the I signal that forms in the baseband.What Fig. 5 b and Fig. 5 c showed is that pilot signal is passed through channel, pilot signal composition severe exacerbation, the schematic diagram of the spectral characteristic in the time of can not finding accurate position on frequency spectrum.
The FPLL system that has pilot signal, the data component except pilot component does not only provide carrier resetting needed information, and behind the carrier resetting, what data took place rocks (jitter) phenomenon.Therefore, in order from the data that receive, to extract pilot component out, should use low territory as shown in Figure 4 to pass through filter.
At this moment, when owing to channel, when pilot signal dies down, pass through filter in order to extract the pilot component that is included in the data out, should use low territory with narrow bandwidth (bandwidth).But, when pilot signal dies down,, shown in Fig. 5 b and Fig. 5 c, use low territory highly beneficial for searching pilot component by filter with wide relatively bandwidth even there is the situation of channel carrier signal frequency offset (carrierfrequency offset).But, as mentioned before, when the composition generation severe exacerbation of pilot signal, merely use low territory by filter with wide bandwidth, also be difficult to extract out pilot component.
Fig. 6 a has shown when receiving system stably receives pilot signal, the schematic diagram of the frequency spectrum of the I signal that forms in the baseband.What Fig. 6 b and Fig. 6 c showed is not die down when pilot signal, has frequency offset, the schematic diagram of the spectral characteristic in the time of can not finding accurate position on frequency spectrum.When using Fig. 6 a to the low territory of the narrow bandwidth of Fig. 6 c during, when the narrow bandwidth of pilot signal disengaging, be not easy to extract out very much pilot component by filter.
Therefore, because existing technologies uses the low territory with wide bandwidth to extract pilot signal out by filter up to now always, when having frequency offset, although other problem does not take place,, when damaging pilot signal owing to the reason of channel, because the output of the I signal of complex product musical instruments used in a Buddhist or Taoist mass is near DC, its power become very a little less than, exist operation to weaken the problem that exists carrier detection to carry out smoothly based on the systematic function of the carrier detection of pilot signal.And, in order to address the above problem, when only using low territory to extract pilot signal out, can not prevent the problem that when having carrier frequency offset (carrier frequencyoffset), takes place by filter with simple narrow bandwidth.
Summary of the invention
The present invention is in order to address the above problem, the signal that provides a kind of reception to modulate, transmit by the vestigial sideband mode for the user is provided, when restoring carrier wave, automatically adjust the bandwidth of the filter of extracting the pilot signal composition that passes through the transmission channel out, can be easy to extract out the residual sideband receiver and the carrier resetting device thereof of pilot signal composition.
To achieve these goals, the present invention receives the signal of modulating and sending by the vestigial sideband mode, restore the residual sideband receiver and the carrier resetting device thereof of carrier wave, more particularly, be the transmission band analog signal that will receive receiver to the Digital Television of baseband digital signal detection.Residual sideband receiver is made of following components, and as feature: by antenna, select the channel frequency of wishing, and after the intermediate frequency conversion, only will be by the digitized digital processes of certain bandwidth of above-mentioned intermediate frequency; Filter is passed through in low territory with the 1st bandwidth of different bandwidth; From the low territory of the 2nd bandwidth by extracting pilot signal the filter out, the carrier resetting portion that utilizes a pilot signal in the pilot signal of extracting out that the carrier signal of baseband in the transmission band signal is restored; In the carrier signal of above-mentioned baseband, remove pilot signal, extract the clock detection section of synchronizing signal out; Utilize above-mentioned synchronizing signal, remove the noise removing portion of the linear noise and the residual phase noise of above-mentioned baseband signal; The lsb decoder that the above-mentioned baseband signal of having removed noise is decoded.
Carrier resetting portion is made of following components, and as feature: the comparing section that the power of the low territory of low territory that will be by above-mentioned the 1st bandwidth by filter and the 2nd bandwidth by the pilot component of filter compares; According to the comparative result of above-mentioned comparing section, select one selection portion in the pilot component of from by filter of the low territory by filter and the 2nd bandwidth, the low territory of above-mentioned the 1st bandwidth, extracting out.
To achieve these goals, carrier resetting device embodiment according to the present invention, it is made of following components, and as feature: with the transmission band signal times of the digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output; The low territory that can extract the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out is by the pilot signal composition of bandwidth 1 the 1st bandwidth of filter and the 1st bandwidth pilot signal and the frequency/phase errors test section of output frequency/phase error composition; Export the pilot signal composition of the 2nd narrower in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth and the 2nd bandwidth pilot signal and the frequency/phase errors test section of frequency/phase errors composition than above-mentioned the 1st bandwidth; The pilot signal composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section and the 2nd bandwidth pilot signal and frequency/phase errors test section are exported separately compares, and the output result who exports a pilot signal and frequency/phase errors test section selects the comparing section of signal; According to the selection signal in the above-mentioned comparing section, select in the frequency/phase errors composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section and the 2nd bandwidth pilot signal and frequency/phase errors test section export separately, and the selection portion of output; The recursive filter of the high frequency composition removing in the frequency/phase errors composition of exporting in the above-mentioned selection portion will be included in; According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
The feature of carrier resetting device of the present invention is: above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section preferably are made of following components: import the I signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, the 1st low territory that constitutes the circulation that detects interior pilot signal composition of above-mentioned the 1st bandwidth and frequency error composition is by filter, the 1st delayer, the 2nd symbol extractor displacer; Import the Q signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the circulation that detects phase error in the 1st bandwidth; Said frequencies sum of errors phase error is multiplied each other, detect the 1st multiplier of frequency/phase errors; Accumulate the power of the pilot signal composition of the 1st symbol extractor displacer output, if reach the pilot power boundary value of setting, generate locking signal, to the 1st integrator of comparing section output.Above-mentioned the 2nd bandwidth pilot signal and frequency/phase errors test section are made of following components: the I signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, and the 1st low territory of the pilot signal composition of formation detection the 2nd bandwidth and the circulation of frequency error composition is by filter, the 2nd delayer, the 2nd symbol extractor displacer; The Q signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the circulation of the phase error that detects the 2nd bandwidth; Said frequencies error and phase error are multiplied each other, detect the 2nd multiplier of frequency/phase errors; Accumulate the power of the pilot signal composition of the 2nd symbol extractor displacer output, if reach the pilot power boundary value of setting, generate locking signal, to the 2nd integrator of comparing section output.
The feature of carrier resetting device is: the pilot power boundary value in above-mentioned the 1st integrator is set than the pilot power boundary value height in the 2nd integrator.
To achieve these goals, another embodiment of carrier resetting device according to the present invention, it is made of following components, and as feature: with the transmission band signal times of the digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output; Can extract bandwidth--the pilot signal composition of 1st bandwidth and 1st bandwidth pilot signal and the frequency/phase errors test section of output frequency/phase error composition of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter; Export the pilot signal composition of the 2nd narrower in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth and the 2nd bandwidth pilot signal and the frequency/phase errors test section of frequency/phase errors composition than above-mentioned the 1st bandwidth; Pilot power in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output and the boundary value of having set are compared, and the comparing section of one selection signal is selected in output from the 1st, the 2 frequency/phase errors test section output result; According to the selection signal of above-mentioned comparing section, select in the frequency/phase errors composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section and the 2nd bandwidth pilot signal and frequency/phase errors test section export separately, and the selection portion of output; The recursive filter of the high frequency composition removing in the frequency/phase errors composition of exporting in the above-mentioned selection portion will be included in; According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
The feature of carrier resetting device of the present invention is: the 1st bandwidth pilot signal and frequency/phase errors test section preferably are made of following components: import the I signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, the 1st low territory that constitutes the circulation that detects interior pilot signal composition of above-mentioned the 1st bandwidth and frequency error composition is by filter, the 1st delayer, the 2nd symbol extractor displacer; Import the Q signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, constitute the 2nd low territory of detecting the interior phase error circulation of the 1st bandwidth and pass through filter; Said frequencies sum of errors phase error is multiplied each other, detect the 1st multiplier of frequency/phase errors.Above-mentioned the 2nd bandwidth pilot signal and frequency/phase errors test section are made of following components: the I signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, and the 1st low territory of the circulation of the frequency error composition of formation detection the 2nd bandwidth is by filter, the 2nd delayer, the 2nd symbol extractor displacer; The Q signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the phase error circulation that detects the 2nd bandwidth; Said frequencies error and phase error are multiplied each other, detect the 2nd multiplier of frequency/phase errors.
The feature of carrier resetting device is: above-mentioned pilot power comparing section preferably is made of following components: filter is passed through in the low territory of extracting pilot signal from the I signal of the baseband of complex product musical instruments used in a Buddhist or Taoist mass output out; The power calculation portion of the power of the pilot signal of calculation of filtered; To compare by above-mentioned power calculation portion pilot power that calculates and the boundary value of having set, produce the comparing section of selecting an output result's control signal in the 1st frequency/phase errors test section and the 2nd frequency/phase errors test section.
The feature of carrier resetting device is: when the pilot power of above-mentioned comparing section during greater than the boundary value set, select the output result of the 1st frequency plot error-detecting portion, the pilot power of above-mentioned comparing section is selected the output result of the 2nd frequency/phase errors test section when less than the boundary value set.
To achieve these goals, carrier resetting device embodiment according to the present invention, it is made of following components, and as feature: with the transmission band signal times of the digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output; Can extract bandwidth--the 1st bandwidth signal filter section of the IQ signal component of 1st bandwidth of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter; Export the I of the 2nd narrower in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth, the 2nd bandwidth signal filter section of Q signal composition than above-mentioned the 1st bandwidth; Import the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section I separately, the Q signal composition is only selected the I of one of them filter section, Q signal composition, and the selection portion of output; The power calculation portion of the pilot signal power of the I signal of calculating selection portion output; Power calculation portion pilot signal power of calculating and the boundary value of having set are compared, control is selected, is exported the I of a filter section in the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section, the Q signal composition, control signal to the comparing section of selection portion output; Detect the I of above-mentioned selection portion output, the frequency/phase errors test section of the frequency/phase errors composition of Q signal; The recursive filter of the high frequency composition removing in the frequency/phase errors composition of exporting in the above-mentioned selection portion will be included in; According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
The feature of carrier resetting device is: said frequencies/phase error detection portion is made of following components: to the I of above-mentioned selection portion output, the delayer that the frequency error of I signal detects in the Q signal, symbol extractor displacer; The frequency error of above-mentioned symbol extractor displacer output is multiplied each other the multiplier of output frequency/phase error with the phase error that comprises Q signal.
To achieve these goals, carrier resetting device embodiment according to the present invention, it is made of following components, and as feature: with the transmission band signal times of the digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output; Can extract bandwidth--the 1st bandwidth signal filter section of the IQ signal component of 1st bandwidth of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter; Export the I of the 2nd narrower in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth, the 2nd bandwidth signal filter section of Q signal composition than above-mentioned the 1st bandwidth; Import the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section I separately, the Q signal composition is only selected the I of one of them filter section, Q signal composition, and the selection portion of output; The power calculation portion of the pilot signal power of the I signal of calculating selection portion output; Detect the I of above-mentioned selection portion output, the frequency/phase errors test section of the frequency/phase errors composition of Q signal; Adjust the gain of the frequency/phase errors composition of said frequencies/phase error detection portion output, and the gain adjustment part of output; Power calculation portion pilot signal power of calculating and the boundary value of having set are compared, control is selected, is exported the I of a filter section in the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section, the control signal of Q signal composition is exported to selection portion, simultaneously, according to above-mentioned pilot signal power, generate the comparing section of the control signal that the gain of above-mentioned gain adjustment part is adjusted; Removing is included in the recursive filter of the high frequency composition in the frequency/phase errors composition of exporting the gain adjustment part; According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
The feature of carrier resetting device is: said frequencies/phase error detection portion is made of following components: detect the I of above-mentioned selection portion output, the delayer of the frequency error of the I signal in the Q signal, symbol extractor displacer; With the frequency error of symbol extractor displacer output with comprise that the phase error of above-mentioned Q signal multiplies each other, the multiplier of output frequency/phase error.
The feature of carrier resetting device is: for the pilot signal power level of calculating with above-mentioned power calculation portion corresponding, with the gain normalization in the gain adjustment part.
Other purposes of the present invention, feature are that advantage will can fully understand by the detailed description of accompanying drawing to embodiment.
Residual sideband receiver of the present invention and carrier resetting device thereof are according to the amplitude of the pilot signal that receives, automatically adjust FPLL circulation gain and extract the bandwidth of the low territory of pilot tone tone out by filter, even reach under the situation that pilot power dies down, also can ensure the effect that stabilized carrier restores.
Description of drawings
Fig. 1 is the formation block diagram of common digital TV dispensing device;
Fig. 2 is the detailed formation block diagram of the VSB modulation portion of the digital TV dispensing device that shows among Fig. 1;
Fig. 3 is the formation block diagram of common digital TV receiving system;
Fig. 4 is the detailed formation block diagram of carrier resetting portion in the digital TV receiving system that shows among Fig. 3;
Fig. 5 a is the schematic diagram of a characteristic of the compound multiplier output signal in the carrier resetting portion that shows among Fig. 4 to Fig. 5 c;
Fig. 6 a is the schematic diagram of another characteristic of the compound multiplier output signal in the carrier resetting portion that shows among Fig. 4 to Fig. 6 c;
Fig. 7 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 1st embodiment;
Fig. 8 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 2nd embodiment;
Fig. 9 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 3rd embodiment;
Figure 10 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 4th embodiment;
Figure 11 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 5th embodiment;
Figure 12 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 6th embodiment;
Figure 13 a and Figure 13 b are that the present invention selects according to the bandwidth of carrier resetting portion, detect the schematic diagram of pilot signal method.
Accompanying drawing major part symbol description
701: the complex product musical instruments used in a Buddhist or Taoist mass
Filter is passed through in the 1st and the 2nd low territory of the 702,703: the 1st bandwidth
705: the 1 symbol extractor displacers of 704: the 1 delayers
706: the 1 multipliers
Filter is passed through in the 1st and the 2nd low territory of the 707,708: the 2nd bandwidth
710: the 2 symbol extractor displacers of 709: the 2 delayers
713: selection portion 714: recursive filter
715: 716: the 1 integrators of voltage-controlled oscillator
717: the 2 integrators
718: the 1 bandwidth pilot signals and frequency/phase errors test section
719: the 2 bandwidth pilot signals and frequency/phase errors test section
Embodiment
Below, the embodiment to residual sideband receiver of the present invention and carrier resetting device is elaborated with reference to the accompanying drawings.
Fig. 7 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 1st embodiment.
The carrier resetting portion of the digital TV receiving system of the present invention the 1st embodiment is made of following components: the I and the Q output signal of input delay device (unmarked among the figure) and Hilbert transducer (unmarked among the figure), the output signal of itself and voltage-controlled oscillator 715 is multiplied each other, to the I of baseband, the complex product musical instruments used in a Buddhist or Taoist mass 701 of Q signal (carrier wave) output; Filter 702 is passed through in the 1st and the 2nd low territory by the 1st bandwidth, 703, the 1st delayer the 704, the 1st symbol extractor displacer the 705, the 1st multiplier the 706, the 1st integrator 716 constitutes, with the I of the baseband of complex product musical instruments used in a Buddhist or Taoist mass 701 output, the 1st bandwidth pilot signal and the frequency/phase errors test section 718 of pilot signal composition in the Q signal in the 1st bandwidth and the output of frequency/phase errors composition; Filter 707 is passed through in the 1st and the 2nd low territory by 2nd bandwidth narrower than the 1st bandwidth, the 708 and the 2nd delayer the 709, the 2nd symbol extractor displacer the 710, the 2nd multiplier 711 and the 2nd integrator 717 constitute, with the I of the baseband of complex product musical instruments used in a Buddhist or Taoist mass 701 output, the 2nd bandwidth pilot signal and the frequency/phase errors test section 719 of pilot signal composition in the Q signal in the 2nd bandwidth and the output of frequency/phase errors composition; The comparing section 712 that the testing result of the pilot signal composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section 718 and the 2nd bandwidth pilot signal and frequency/phase errors test section 719 are exported separately compares; Comparative result according to above-mentioned comparing section 712, receive the frequency/phase errors result that the 1st bandwidth pilot signal and frequency/phase errors test section 718 and the 2nd bandwidth pilot signal and frequency/phase errors test section 719 are exported separately, select one of them, and the selection portion 713 of output; The recursive filter 714 that the high frequency composition that is included in the frequency/phase errors composition of selection portion 713 output is removed; According to the frequency/phase errors composition of having removed the high frequency composition, change concussion frequency, the voltage-controlled oscillator that shakes (with Numerical Control oscillator (NCO)) 715.
The present invention from the 1st embodiment to the 6 embodiment to the pilot signal of detected transmission band signal respectively in wide bandwidth and narrow bandwidth, under situation that the power of skew and pilot signal dies down takes place in frequency, be fit to too, select bandwidth automatically and adjust frequency/gain of phase error information describes.
The present invention is similar from the shown digital TV receiving system of the basic comprising of the 1st embodiment to the 6 embodiment and Fig. 3, the different just carrier resetting portion reinsertions of carrier, digital processes is passed through antenna, select the channel frequency of hope, after being transformed into intermediate frequency, only pass through certain bandwidth of intermediate frequency, digitlization, in wide bandwidth and narrow bandwidth, detect the pilot signal of this transmission band signal respectively, when occurrence frequency is setovered, especially when the power of pilot signal dies down, can detect the pilot signal composition rapidly, restore carrier wave.
In addition, owing to remove pilot signal, extract out synchronizing signal the clock detection section, utilize above-mentioned synchronizing signal, remove the noise removing portion of the straight line noise of baseband signal and residual phase noise and (for example will remove lsb decoder that the baseband signal of noise decodes, FEC portion) formation is identical with the common formation of the digital TV receiving system of existing technologies, here, omission is about the detailed description of these contents.
And, feature about the 1st bandwidth and the 2nd bandwidth is: when the carrier resetting device of the 1st bandwidth and existing technologies detects bandwidth that pilot signal uses and is same bandwidth, the the 1st and the 2nd low territory of the 2nd bandwidth is by filter 707, the the 1st and the 2nd low territory of 708 to the 1 bandwidth is by filter 702,703 have narrow relatively bandwidth (for example, 1/2 to 1/4 bandwidth).That is, the 1st bandwidth is in order to extract out in the bandwidth that has the pilot signal composition under the frequency offset situation in the wide bandwidth, and the 2nd bandwidth is the bandwidth of the pilot signal composition that dies down gradually for the signal power of extracting out in narrow bandwidth.
Usually, if in FPLL locking frequency, pilot signal is positioned at DC, the 1st, the 2 symbol extractor displacer 705,710 is extracted 1 signal continuously out, and output.
At this moment, pass through the pilot component signal of filter 702 by the 1st symbol extractor displacer 705 by the 1st bandwidth the 1st low territory, in 716 li accumulation of the 1st integrator, pass through the pilot component signal of filter 707 by the 2nd symbol extractor displacer 710, in 717 li accumulation of the 2nd integrator by the 2nd bandwidth the 1st low territory.
The 1st, if the numerical value of the 2nd integrator 716,717 accumulation reaches the pilot power limit of setting in the integrator separately (threshold), generated frequency locking (lock) signal respectively.
Here, frequency lock circulation (FLL) shows the 1st, the 2 integrator 716,717 information of output valve separately.In order in two circulations, to select one, generate locking signal, be necessary to utilize and be lower than each integrator 716,717 boundary value (threshold) (promptly, locking (lock) value) (boundary value of the 1st integrator 716 is called as the 1st boundary value (lock ') to boundary value (threshold), the boundary value of the 2nd integrator 717 is called as the 2nd boundary value (lock ")), grasps the value of the 1st, the 2 integrator 716,717 accumulation.
Promptly, the 1st integrator 716 is circulated in the 1st bandwidth pilot signal and frequency/phase errors test section 718 sides, the 2nd integrator 717 transmits to comparing section 712 at the state that converges of the 2nd bandwidth pilot tone letter and the circulation of frequency/phase errors test section 719 sides, comparing section 712 is used respectively and is lower than the 1st of original boundary value (lock), the 2nd boundary value (lock ', lock ") (with reference to Figure 13) is so that select fast one to help the circulation of converging more in two circulations.
As shown in Figure 7, when whole circulations are made of following two circulations: circulate by the FPLL that filter 702,703 forms by low territory with wide relatively bandwidth; Circulate by the FPLL that filter 707,708 constitutes by low territory with narrow relatively bandwidth.In each circulation, according to new boundary value, can generate new locking (lock ', lock ") signal, comparing section 712 generates these two new lock values is compared, and selects the selection signal of one of them circulation, and sends it to selection portion 713.
At this moment, the frequency lock-in range that the DTV standard of ATSC is pointed out is satisfied in circulation with wide bandwidth, comparing section 712 with two lockings (lock ', lock ") signal compares; under the common frequency channel situation of normal reception pilot tone, uses the circulation with wide bandwidth, for cycle stability; when two circulations all lock, and also uses the circulation with wide bandwidth.
Promptly, Figure 13 a has shown that the 1st and the 2nd low territory of the 1st bandwidth is by filter 702, the testing process of 703 pilot signal composition, Figure 13 b has shown to have than the 1st and the 2nd low territory of the 2nd bandwidth of the bandwidth of the 1st narrow bandwidth testing process by the pilot signal composition of filter 707,708.The output result of comparing section 712 is applied to separately the output result's of integrator 716,717 the 1st and the 2nd boundary value (lock ') (among the lock "), can selects favourable circulation fast.Therefore, according to the power of pilot signal composition, can reduce the pilot signal detection error.If power is in more than the 1st boundary value (lock '), as Figure 13 a showed, the low territory by detecting wide frequency bandwidth can prevent the pilot signal detection error by the pilot signal of filter; If being in the 2nd boundary value, the power of pilot signal composition (on the lock "); as Figure 13 b shows; the low territory by detecting narrow frequency bandwidth is by the pilot signal of filter, can make the die down error of the pilot signal detection under the situation of pilot signal power reach and minimize.
If determined a circulation in the 1st bandwidth pilot signal and frequency/phase errors test section 718 and the 2nd bandwidth pilot signal and the frequency/phase errors test section 719, the frequency/phase errors composition (control composition) of the circulation output that 713 of selection portions will determine is to recursive filter 714 outputs, according to this output, after recursive filter 714 is removed the high frequency composition that is included in the frequency/phase errors composition, to voltage-controlled oscillator 715 outputs, voltage-controlled oscillator 715 is according to control voltage, change concussion frequency is to 701 outputs of complex product musical instruments used in a Buddhist or Taoist mass.At this moment, recursive filter 714 and the voltage-controlled oscillator 715 that comprises the circulation of the pilot signal detection of circulation of decision and frequency/phase errors test section constitutes FPLL.
Fig. 8 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 2nd embodiment.
The carrier resetting portion of the digital TV receiving system of the present invention the 2nd embodiment is made of following components: the I and the Q output signal of input delay device (unmarked among the figure) and Hilbert transducer (unmarked among the figure), the output signal of itself and voltage-controlled oscillator (perhaps Numerical Control oscillator (NCO)) 817 is multiplied each other, to the I of baseband, the complex product musical instruments used in a Buddhist or Taoist mass 801 of Q signal (carrier wave) output; Filter 802 is passed through in the 1st and the 2nd low territory by the 1st bandwidth, 803, the 1st delayer the 804, the 1st symbol extractor displacer the 805, the 1st multiplier 806 constitutes, with the I of the baseband of complex product musical instruments used in a Buddhist or Taoist mass 801 output, the 1st bandwidth pilot signal and the frequency/phase errors test section 818 of pilot signal composition in the Q signal in the 1st bandwidth and the output of frequency/phase errors composition; Filter 807 is passed through in the 1st and the 2nd low territory by 2nd bandwidth narrower than the 1st bandwidth, the 808 and the 2nd delayer the 809, the 2nd symbol extractor displacer the 810, the 2nd multiplier 811 constitutes, with the I of the baseband of complex product musical instruments used in a Buddhist or Taoist mass 801 output, the 2nd bandwidth pilot signal and the frequency/phase errors test section 819 of pilot signal composition in the Q signal in the 2nd bandwidth and the output of frequency/phase errors composition; Constitute by filter 812 and power calculation portion 813 and comparing section 814 by the 3rd low territory, pilot signal composition in the I signal of the baseband of extraction complex product musical instruments used in a Buddhist or Taoist mass 810 outputs, the power of pilot signal is compared with the boundary value of having set, select output result in the 1st frequency/phase errors test section 818 and the 2nd frequency/phase errors test section 819, produce the pilot power comparing section 820 of control signal; According to the output result of above-mentioned pilot power comparing section 820, export the selection portion 815 of a frequency/phase errors result in the 1st frequency/phase errors test section 818 and the 2nd frequency/phase errors test section 819; The recursive filter 816 that the high frequency composition that is included in the frequency/phase errors composition of selection portion 815 output is removed; According to the frequency/phase errors composition of having removed the high frequency composition, change concussion frequency, the voltage-controlled oscillator 817 that shakes.
The 1st bandwidth of the present invention the 2nd embodiment and the scope of the 2nd bandwidth are identical with the scope of the 1st embodiment.And, the 3rd low territory in the pilot power comparing section 820 is by the signal of the frequency bandwidth of the I signal pilot signal of 812 in the filter baseband by being included in 801 outputs of complex product musical instruments used in a Buddhist or Taoist mass, pilot signal power is calculated by power calculation portion 813, and sends it to comparing section 814.
Promptly, the pilot signal boundary value that the present invention the 2nd embodiment has set the pilot signal power and the pilot power comparing section 820 of transmission compares, if the pilot signal power that transmits is on the boundary value, control signal selection portion 815 outputs of the 1st frequency/phase errors test section 818 circulations will be selected; If the pilot signal power that transmits does not reach boundary value, will select the control signal of the 2nd frequency/phase errors test section 819 circulations to selection portion 815 outputs.
Then, according to above-mentioned control signal, the frequency/phase errors composition (control composition) of the circulation output that selection portion 815 will be selected from 818 circulations of the 1st frequency/phase errors test section and 819 circulations of the 2nd frequency/phase errors test section is to recursive filter 816 outputs, after recursive filter 816 is removed the high frequency composition that is included in the frequency/phase errors composition, to voltage-controlled oscillator 817 outputs, voltage-controlled oscillator 817 is according to control voltage, change concussion frequency is to 801 outputs of complex product musical instruments used in a Buddhist or Taoist mass.At this moment, recursive filter 816 and the voltage-controlled oscillator 817 that comprises the frequency/phase errors test section (818 and 819) of the circulation of decision moves to FPLL.
Fig. 9 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 3rd embodiment.
The carrier resetting portion of the digital TV receiver of the 3rd embodiment of the present invention is made of following components: the I and the Q output signal of input delay device (unmarked among the figure) and Hilbert transducer (unmarked among the figure), the output signal of itself and voltage-controlled oscillator 913 is multiplied each other, to the I of baseband, the complex product musical instruments used in a Buddhist or Taoist mass 901 of Q signal (carrier wave) output; The the 1st and the 2nd low territory by the 1st bandwidth constitutes by filter 902,903, with the I in the 1st bandwidth in the baseband signal of complex product musical instruments used in a Buddhist or Taoist mass 901 outputs, and the 1st bandwidth signal filter section 914 that the signal component beyond the Q signal composition carries out filtering; The the 1st and the 2nd low territory by the 2nd bandwidth constitutes by filter 904,905, with in the baseband signal of complex product musical instruments used in a Buddhist or Taoist mass 901 outputs except the I in the 2nd bandwidth, the 2nd bandwidth signal filter section 915 that the signal component beyond the Q signal composition carries out filtering; Optionally export the I of any one bandwidth in the 1st, the 2 bandwidth I Q signal that above-mentioned the 1st bandwidth signal filter section 914 and the 2nd bandwidth signal filter section 915 export separately, the selection portion 906 of Q signal; Calculate the I of above-mentioned selection portion 906 outputs, the power calculation portion 907 of the pilot signal power of I signal in the Q signal; Above-mentioned power calculation portion 907 pilot signal power of calculating and the boundary values of having set are compared, with comparing section 908 from the control signal of the output signal of any one bandwidth in the output signal of above-mentioned the 1st bandwidth signal filter section 914 and the 2nd bandwidth signal filter section 915 to selection portion 906 outputs that select; Constitute the frequency/phase errors test section 916 of the frequency/phase errors composition of the IQ signal of detection selection portion 906 outputs by delayer 909, symbol extractor displacer 910, multiplier 911; Removing is included in the recursive filter 912 of the high frequency composition in the frequency/phase errors composition that said frequencies/phase error detection portion 916 exports; According to the frequency/phase errors composition of having removed the high frequency composition, change concussion frequency, the voltage-controlled oscillator that shakes (or Numerical Control oscillator (NCO)) 913.
The 1st bandwidth of the present invention the 3rd embodiment and the scope of the 2nd bandwidth are identical with the scope of the 1st embodiment.And, selection portion 906 is hanged down the signal that comprises the frequency bandwidth of pilot signal in the I signal of territory by filter 904 outputs by the 1st low territory of the 1st bandwidth in the early stage by the 1st of filter 902 and the 2nd bandwidth, the power of pilot signal calculates in power calculation portion 907, transmits to comparing section 908.
The power of the pilot signal that the boundary value of the pilot signal power that comparing section 908 will have been set and power calculation portion 907 transmit compares, if will be in boundary value when above, select the control signal of the 1st bandwidth signal filter section 914 and be in boundary value when following, select the control signal of the 2nd bandwidth signal filter section 915 to export to selection portion 906.
According to this output, frequency/phase errors test section 916 detects composition (control composition) to recursive filter 912 outputs with frequency/phase errors, after recursive filter 912 is removed the high frequency composition that is included in the frequency/phase errors composition, to voltage-controlled oscillator 913 outputs, voltage-controlled oscillator 913 is according to control voltage, change concussion frequency is to 901 outputs of complex product musical instruments used in a Buddhist or Taoist mass.At this moment, the bandwidth signal filter section 914 and 915 of decision, frequency/phase errors test section 916, recursive filter 912 and voltage-controlled oscillator 913 move to FPLL.
The present invention the 3rd embodiment compares with the 2nd embodiment with the present invention the 1st embodiment, has the inscape by still less, selects the advantage of required bandwidth automatically, can realize the stability of fast-changing channel receiving system.
Figure 10 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 4th embodiment.
The carrier resetting portion of the present invention the 4th embodiment is made of following components: with transmission band (PassBand) analog signal to digital signal conversion, and output, it turned over turn 90 degrees, be transformed into the Q signal of imaginary number composition after, the Hilbert transducer of output (unmarked among the figure); After delay becomes above-mentioned digital signal conversion processing time of Q signal of Hilbert transducer, I with the delayer (unmarked among the figure) of the I signal of output real number composition, the output signal of Q output signal and voltage-controlled oscillator (perhaps Numerical Control oscillator (NCO)) 1011 multiplies each other, to the I of baseband, the complex product musical instruments used in a Buddhist or Taoist mass 1001 of Q signal (carrier wave) output; Constitute by filter 1004, delayer 1006, symbol extractor displacer 1007, multiplier 1008, recursive filter 1010 and voltage-controlled oscillator (VCO) 1011 by the 1st low territory, the FLL of the frequency of the I signal of locking baseband (Frequency Locked Loop: the frequency lock circulation) and by the 2nd low territory constitute the PLL of the phase place of locking Q signal (Phase Locked Loop: the phase locking circulation) FPLL1030 that forms by filter 1005, multiplier 1008, recursive filter 1010 and voltage-controlled oscillator (VCO) 1011; Calculate the power calculation portion 1009 of the 1st low territory by the pilot power of the I signal of filter 1004 outputs; The comparing section 1012 that power calculation portion 1009 pilot power that calculates and the boundary value of having set and standard value are compared; By being positioned at complex product musical instruments used in a Buddhist or Taoist mass 1001 and the 1st, the 2nd low territory is by filter 1004, between 1005, according to the output result of comparing section 1012, adjust the I of complex product musical instruments used in a Buddhist or Taoist mass 1001 outputs, the gain of Q output signal (gain), the gain of restoring the pilot signal of carrier wave is adjusted into desired gain, the gain controlling instrument 1020 that constitutes to the 1st, the 2 gain adjustment part 1002,1003 of FPLL1030 output.
The basic comprising of the digital TV receiving system of the present invention the 4th embodiment is similar with the digital TV receiving system that Fig. 3 shows, different just carrier resetting portions have restored carrier wave.Common digital processes is passed through antenna, select the channel frequency of hope, after being transformed into intermediate frequency, the certain bandwidth by above-mentioned intermediate frequency only, digitlization, the 1st low territory of carrier resetting undesired signal compares by the performance number of the output signal of filter 1004 and standard value and the boundary value of having set in this transmission band signal with removing, according to comparative result, the gain of the pilot component of above-mentioned digitized transmission band signal is adjusted into desired gain, restore the carrier wave of baseband, remove pilot signal in addition, extract the clock detection section of synchronizing signal out; Utilize above-mentioned synchronizing signal, remove the straight line noise of baseband signal and the noise removing portion of residual phase noise; (for example, FEC portion) formation is identical with common structure, so here, omission is about their detailed description for the lsb decoder that the baseband signal of removing noise is decoded.
That is, above-mentioned FPLL algorithm is carried out carrier resetting based on pilot signal.Therefore, in order to remove the unwanted data component of carrier resetting, use the 1st low territory by filter 1004, the power of this 1st low territory by the pilot signal of filter 1004 outputs calculates in power calculation portion 1009.
And the pilot power value that gain adjustment part 1002,1003 utilizes power calculation portion 1009 to calculate is adjusted the input signal of the 1st, the 2 low territory by filter 1004,1005.That is, adjust the I of carrier resetting portion, the gain of Q output signal (gain).
Therefore, can adjust the gain of filter input signal according to the degree of the 1st, the 2 low territory of constantly reducing by the output signal of filter 1004,1005 along with the minimizing of pilot signal gain.Like this, when according to the 1st, the 2nd low territory is by filter 1004, the pilot power (power) of input signals of 1005 inputs, when the gain (gain) of filter input signal is adjusted into standardization (normalization), the 1st, the 2nd low territory is by filter 1004,1005 can import when existing straight line noise, pilot power to die down under the situation, also have the pilot signal of certain power (power).When the gain of pilot signal dies down,, reach the effect that enlarges the FPLL whole gains of circulation (gain) by enlarging it.
Figure 11 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 5th embodiment.
The carrier resetting portion of the digital TV receiving system of the present invention the 5th embodiment is made of following components: with transmission band (PassBand) analog signal to digital signal conversion, and output, it is turned over turn 90 degrees, after being transformed into the Q signal of imaginary number composition, the Hilbert transducer of output (unmarked among the figure); After delay becomes above-mentioned digital signal conversion processing time of Q signal of Hilbert transducer, the delayer (unmarked among the figure) of the I signal of output real number composition; With the I of above-mentioned delayer and Hilbert transducer, the output signal of Q output signal and voltage-controlled oscillator (perhaps Numerical Control oscillator (NCO)) 1111 multiplies each other, to the I of baseband, and the complex product musical instruments used in a Buddhist or Taoist mass 1101 of Q signal (carrier wave) output; Pass through filter 1102 by the 1st low territory, delayer 1104, symbol extractor displacer 1105, multiplier 1106, recursive filter 1110 and voltage-controlled oscillator (perhaps Numerical Control oscillator (NCO)) 1111 constitutes, the FLL of the frequency of the I signal of locking baseband (Frequency Locked Loop: the frequency lock circulation) and by the 2nd low territory pass through filter 1103, multiplier 1106, recursive filter 1110 and voltage-controlled oscillator 1111 constitute, the PLL of the phase place of the Q signal of locking baseband (Phase Locked Loop: the phase locking circulation) FPLL1130 that forms; Calculate the power calculation portion 1107 of the 1st low territory by the pilot power of the I signal of filter 1102; The comparing section 1108 that compares with boundary value that set and standard value I signal with 1107 calculating of power calculation portion; By the output valve that receives above-mentioned multiplier 1106 and the output result of comparing section 1108, adjust the gain (gain) of the frequency/phase errors composition (error) of multiplier 1106 outputs, the gain controlling instrument 1120 that constitutes to the gain adjustment part 1109 of recursive filter 1110 outputs.
In the present invention the 5th embodiment, the I of complex product musical instruments used in a Buddhist or Taoist mass 1101 output actual carrier recovery portions, Q signal.
When hypothesis the 1st low territory during by the passing through gain and be 1 of filter 1102, because symbol extractor displacer 1105 is not subjected to any influence of signal gain, the embodiment of Figure 11 is identical with the embodiment of Figure 10, all is gain adjustment part 1109 is positioned over multiplier 1106 lower ends.
By Figure 11, can resolve the gain (gain) that multiplier (error detector) 1106 is adjusted in gain adjustment part 1109.The present invention the 5th embodiment when pilot signal dies down, adjusts all gains of circulation by enlarging from the gain of the error of multiplier 1106 extractions.
Figure 12 is the detailed formation block diagram of carrier resetting portion of the digital TV receiving system of the present invention the 6th embodiment.
The carrier resetting portion of the digital TV receiving system of the present invention the 6th embodiment is made of following components: the I and the Q output signal of input delay device (unmarked among the figure) and Hilbert transducer (unmarked among the figure), the output signal of itself and voltage-controlled oscillator (1214) is multiplied each other, to the I of baseband, the complex product musical instruments used in a Buddhist or Taoist mass 1201 of Q signal (carrier wave) output; The the 1st and the 2nd low territory by the 1st bandwidth constitutes by filter 1202,1203, with the I in the 1st bandwidth in the baseband signal of complex product musical instruments used in a Buddhist or Taoist mass 1201 outputs, and the 1st bandwidth pilot signal filter section 1215 of Q signal output; The the 1st and the 2nd low territory by the 2nd bandwidth constitutes by filter 1204,1205, with the I of the baseband of complex product musical instruments used in a Buddhist or Taoist mass 1201 outputs, the 2nd bandwidth pilot signal filter section 1216 that the pilot signal composition in the Q signal in the 2nd bandwidth is exported; Import the 1st bandwidth I that above-mentioned the 1st bandwidth pilot signal filter section 1215 and the 2nd bandwidth pilot signal filter section 1216 are exported separately, Q signal and the 2nd bandwidth I, Q signal is selected the IQ signal of one of them bandwidth, and the selection portion 1206 of output; Constitute by delayer 1209, symbol extractor displacer 1210 and multiplier 1211, detect the I of above-mentioned selection portion 1206 outputs, the frequency/phase errors test section 1217 of frequency/phase errors composition in the Q signal; The power calculation portion 1207 of the pilot signal power of the output signal of calculating selection portion 1206; The boundary value and the fiducial value of power calculation portion 1207 pilot signal power of calculating and the pilot signal power of having set are compared, according to comparative result, the control signal of an output signal in the output of selection portion 1206 output above-mentioned the 1st bandwidth pilot signal filter section 1215 of selection and the 2nd bandwidth pilot signal filter section 1216, simultaneously, can adjust the comparing section 1208 of control signal of gain (gain) of the output signal of said frequencies/phase error detection portion 1217 to the output of gain adjustment part 1212; According to the comparative result of above-mentioned comparing section 1208, the gain adjustment part 1212 that the gain (gain) of the frequency/phase errors composition (error) of frequency/phase errors test section 1217 output is adjusted; Removing is included in the recursive filter 1213 of the high frequency composition in the frequency/phase errors composition of exporting gain adjustment part 1212; According to the frequency/phase errors composition of having removed the high frequency composition, change concussion frequency, the voltage-controlled oscillator 1214 that shakes.
The 1st bandwidth of the present invention the 6th embodiment the inside and the scope of the 2nd bandwidth are also the same with the 1st embodiment.And, selection portion 1206 is hanged down the signal of the frequency bandwidth of the pilot signal that comprises in the I signal of territory by filter 1204 outputs in the early stage by the 1st of filter 1202 and the 2nd bandwidth by the 1st low territory of the 1st bandwidth, the power of pilot signal calculates in power calculation portion 1207, transmits to comparing section 1208.
The power of the pilot signal that the boundary value of the pilot signal power that comparing section 1208 will have been set and power calculation portion 1207 transmit compares, if the power of the pilot signal that power calculation portion is transmitted is in more than the boundary value, select the 1st bandwidth pilot signal filter section 1215, if be in below the boundary value, the control signal of selecting the 2nd bandwidth pilot signal filter section 1216 is to selection portion 1206 outputs.And, comparing section 1208 is according to above-mentioned comparative result, adjust the gain of pilot power, this make with along with pilot power constantly weakens, the 1st of continuous the 2nd bandwidth that reduces, the 2nd low territory is by the output signal correspondence of filter 1204,1205, and the gain (gain) of adjusting gain adjustment part 1212 reaches standardization (normalization) becomes possibility.That is, when pilot signal is died down relatively by amplitude,, reach the effect that enlarges the whole gain (gain) of FPLL circulation by enlarging it.
And, selection portion 1206 is exported the baseband IQ signal of a filter section output in the 1st bandwidth pilot signal filter section 1215 and the 2nd bandwidth pilot signal filter section 1216 according to the control signal of comparing section 1208 to frequency/phase errors test section 1217.
Frequency/phase errors test section 1217 detects composition (control composition) to 1212 outputs of gain adjustment part with frequency/phase errors, gain adjustment part 1212 is according to the comparative result of comparing section 1208, adjust frequency/gain of phase error composition, to recursive filter 1213 outputs, after recursive filter 1213 is removed the high frequency composition that is included in the frequency/phase errors composition, to voltage-controlled oscillator 1214 outputs, voltage-controlled oscillator 1214 is according to control voltage, change concussion frequency is to 1201 outputs of complex product musical instruments used in a Buddhist or Taoist mass.At this moment, one filter section, frequency/phase errors test section 1217, recursive filter 1213 and voltage-controlled oscillator 1214 constitute FPLL in the pilot signal filter section 1215 and 1216 of decision.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (16)
1, a kind of residual sideband receiver, it comprises:
By antenna, select the channel frequency of hope, after the intermediate frequency conversion, only will be by the digitized digital processes of certain bandwidth of above-mentioned intermediate frequency;
Filter is passed through in low territory with the 1st bandwidth of different bandwidth;
From the low territory of the 2nd bandwidth by extracting pilot signal the filter out, the carrier resetting portion that utilizes a pilot signal in the pilot signal of extracting out that the carrier signal of baseband in the transmission band signal is restored;
In the carrier signal of above-mentioned baseband, remove pilot signal, extract the clock detection section of synchronizing signal out;
Utilize above-mentioned synchronizing signal, remove the noise removing portion of the linear noise and the residual phase noise of above-mentioned baseband signal;
The lsb decoder that the above-mentioned baseband signal of having removed noise is decoded.
2, residual sideband receiver as claimed in claim 1 is characterized in that, above-mentioned carrier resetting portion comprises:
The comparing section that the power of the low territory of low territory that will be by above-mentioned the 1st bandwidth by filter and the 2nd bandwidth by the pilot component of filter compares;
According to the comparative result of above-mentioned comparing section, from the low territory by filter and the 2nd bandwidth, the low territory of above-mentioned the 1st bandwidth by selecting one selection portion in the pilot component of extracting out one in the filter.
3, a kind of carrier resetting device, it comprises:
With the transmission band signal times of digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output;
Can extract bandwidth--the pilot signal composition of 1st bandwidth and 1st bandwidth pilot signal and the frequency/phase errors test section of output frequency/phase error composition of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter;
Export in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output than the pilot signal composition of the 2nd bandwidth of above-mentioned the 1st narrow bandwidth and the 2nd bandwidth pilot signal and the frequency/phase errors test section of frequency/phase errors composition;
The pilot signal composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section and the 2nd bandwidth pilot signal and frequency/phase errors test section are exported separately compares, and the output result who exports a pilot signal and frequency/phase errors test section selects the comparing section of signal;
According to the selection signal in the above-mentioned comparing section, select in the frequency/phase errors composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section and the 2nd bandwidth pilot signal and frequency/phase errors test section export separately, and the selection portion of output;
The recursive filter of the high frequency composition removing in the frequency/phase errors composition of exporting in the above-mentioned selection portion will be included in;
According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
4, carrier resetting device as claimed in claim 3 is characterized in that, the 1st bandwidth pilot signal and frequency/phase errors test section comprise:
Import the I signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, the 1st low territory that constitutes the circulation that detects interior pilot signal composition of above-mentioned the 1st bandwidth and frequency error composition is by filter, the 1st delayer, the 2nd symbol extractor displacer;
Import the Q signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the circulation that detects phase error in the 1st bandwidth;
Said frequencies sum of errors phase error is multiplied each other, detect the 1st multiplier of frequency/phase errors;
Accumulate the power of the pilot signal composition of the 1st symbol extractor displacer output, if reach the pilot power boundary value of setting, generate locking signal, to the 1st integrator of comparing section output.
5, carrier resetting device as claimed in claim 3 is characterized in that, above-mentioned the 2nd bandwidth pilot signal and frequency/phase errors test section comprise:
The I signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, the 1st low territory of the pilot signal composition of formation detection the 2nd bandwidth and the circulation of frequency error composition is by filter, the 2nd delayer, the 2nd symbol extractor displacer;
The Q signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the circulation of the phase error that detects the 2nd bandwidth;
Said frequencies error and phase error are multiplied each other, detect the 2nd multiplier of frequency/phase errors;
Accumulate the power of the pilot signal composition of the 2nd symbol extractor displacer output, if reach the pilot power boundary value of setting, generate locking signal, to the 2nd integrator of comparing section output.
As claim 4 or 5 described carrier resetting devices, it is characterized in that 6, the pilot power boundary value in above-mentioned the 1st integrator is set than the pilot power boundary value height in the 2nd integrator.
7, a kind of carrier resetting device, it comprises:
By with the transmission band signal times of digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output;
Can extract bandwidth--the pilot signal composition of 1st bandwidth and 1st bandwidth pilot signal and the frequency/phase errors test section of output frequency/phase error composition of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter;
Export the pilot signal composition of the 2nd narrower relatively in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth and the 2nd bandwidth pilot signal and the frequency/phase errors test section of frequency/phase errors composition than above-mentioned the 1st bandwidth;
Pilot power in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output and the boundary value of having set are compared, output from the 1st, the 2 frequency/phase errors test section output result, select one the comparing section of selection signal;
According to the selection signal of above-mentioned comparing section, select in the frequency/phase errors composition that above-mentioned the 1st bandwidth pilot signal and frequency/phase errors test section and the 2nd bandwidth pilot signal and frequency/phase errors test section export separately, and the selection portion of output;
The recursive filter of the high frequency composition removing in the frequency/phase errors composition of exporting in the above-mentioned selection portion will be included in;
According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
8, carrier resetting device as claimed in claim 7 is characterized in that, the 1st bandwidth pilot signal and frequency/phase errors test section comprise:
Import the I signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, the 1st low territory that constitutes the circulation that detects interior pilot signal composition of above-mentioned the 1st bandwidth and frequency error composition is by filter, the 1st delayer, the 2nd symbol extractor displacer;
Import the Q signal of the baseband of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the circulation that detects phase error in the 1st bandwidth;
Said frequencies sum of errors phase error is multiplied each other, detect the 1st multiplier of frequency/phase errors.
9, carrier resetting device as claimed in claim 7 is characterized in that, above-mentioned the 2nd bandwidth pilot signal and frequency/phase errors test section comprise:
The I signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, the 1st low territory of the circulation of the frequency error composition of formation detection the 2nd bandwidth is by filter, the 2nd delayer, the 2nd symbol extractor displacer;
The Q signal of the baseband of input complex product musical instruments used in a Buddhist or Taoist mass output, filter is passed through in the 2nd low territory that constitutes the circulation of the phase error that detects the 2nd bandwidth;
Said frequencies error and phase error are multiplied each other, detect the 2nd multiplier of frequency/phase errors.
10, carrier resetting device as claimed in claim 7 is characterized in that, above-mentioned pilot power comparing section comprises:
From the I signal of the baseband of complex product musical instruments used in a Buddhist or Taoist mass output, extract the low territory of pilot signal out and pass through filter;
The power calculation portion of the power of the pilot signal of calculation of filtered;
To compare by above-mentioned power calculation portion pilot power that calculates and the boundary value of having set, produce the comparing section of selecting an output result's control signal in the 1st frequency/phase errors test section and the 2nd frequency/phase errors test section.
11, as claim item 10 described carrier resetting devices, it is characterized in that, when the pilot power of above-mentioned comparing section during greater than the boundary value set, select the output result of the 1st frequency plot error-detecting portion, the pilot power of above-mentioned comparing section is selected the output result of the 2nd frequency/phase errors test section when less than the boundary value set.
12, a kind of carrier resetting device, it comprises:
By with the transmission band signal times of digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output;
Can extract bandwidth--the 1st bandwidth signal filter section of the IQ signal component of 1st bandwidth of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter;
Export the I of the 2nd narrower relatively in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth, the 2nd bandwidth signal filter section of Q signal composition than above-mentioned the 1st bandwidth;
Import the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section I separately, the Q signal composition is only selected I in the filter section therein, Q signal composition, and the selection portion of output;
The power calculation portion of the pilot signal power of the I signal of calculating selection portion output;
Power calculation portion pilot signal power of calculating and the boundary value of having set are compared, select the I of a filter section in the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section, the Q signal composition, output is with the signal of the control comparing section to selection portion output;
Detect the I of above-mentioned selection portion output, the frequency/phase errors test section of the frequency/phase errors composition of Q signal;
The recursive filter of the high frequency composition removing in the frequency/phase errors composition of exporting in the above-mentioned selection portion will be included in;
According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
13, carrier resetting device as claimed in claim 12 is characterized in that, said frequencies/phase error detection portion comprises:
To the I of above-mentioned selection portion output, the delayer that the frequency error of I signal detects in the Q signal, symbol extractor displacer;
The frequency error of above-mentioned symbol extractor displacer output is multiplied each other the multiplier of output frequency/phase error with the phase error that comprises Q signal.
14, a kind of carrier resetting device, it comprises:
By with the transmission band signal times of digital conversion concussion frequency with oscillator, restore the carrier wave of baseband signal, and the complex product musical instruments used in a Buddhist or Taoist mass of output;
Can extract bandwidth--the 1st bandwidth signal filter section of the IQ signal component of 1st bandwidth of the low territory of the common pilot signal in the baseband signal that is included in above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output out by filter;
Export the I of the 2nd narrower in the baseband signal of above-mentioned complex product musical instruments used in a Buddhist or Taoist mass output bandwidth, the 2nd bandwidth signal filter section of Q signal composition than above-mentioned the 1st bandwidth;
Import the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section I separately, the Q signal composition is only selected I in the filter section therein, Q signal composition, and the selection portion of output;
The power calculation portion of the pilot signal power of the I signal of calculating selection portion output;
Detect the I of above-mentioned selection portion output, the frequency/phase errors test section of the frequency/phase errors composition of Q signal;
Adjust the gain of the frequency/phase errors composition of said frequencies/phase error detection portion output, and the gain adjustment part of output;
Power calculation portion pilot signal power of calculating and the boundary value of having set are compared, select the I of a filter section in the 1st bandwidth signal filter section and the 2nd bandwidth signal filter section, the Q signal composition, output, the signal of control is exported to selection portion, simultaneously, according to above-mentioned pilot signal power, generate the comparing section of the control signal that the gain of above-mentioned gain adjustment part is adjusted;
Removing is included in the recursive filter of the high frequency composition in the frequency/phase errors composition of exporting the gain adjustment part;
According to the above-mentioned frequency/phase errors composition of removing the high frequency composition, change concussion frequency, the oscillator that shakes.
15, carrier resetting device as claimed in claim 14 is characterized in that, said frequencies/phase error detection portion comprises:
Detect the I of above-mentioned selection portion output, the delayer of the frequency error of the I signal in the Q signal, symbol extractor displacer;
With the frequency error of symbol extractor displacer output with comprise that the phase error of above-mentioned Q signal multiplies each other, the multiplier of output frequency/phase error.
16, carrier resetting device as claimed in claim 14 is characterized in that, for the pilot signal power level of calculating with above-mentioned power calculation portion corresponding, with the gain normalization in the gain adjustment part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200410084203XA CN1777162A (en) | 2004-11-16 | 2004-11-16 | Residual sideband receiver and its carrier resetting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200410084203XA CN1777162A (en) | 2004-11-16 | 2004-11-16 | Residual sideband receiver and its carrier resetting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1777162A true CN1777162A (en) | 2006-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200410084203XA Pending CN1777162A (en) | 2004-11-16 | 2004-11-16 | Residual sideband receiver and its carrier resetting device |
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| Country | Link |
|---|---|
| CN (1) | CN1777162A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846844A (en) * | 2015-01-29 | 2016-08-10 | 拉碧斯半导体株式会社 | Receiving apparatus and receiving method |
| CN108521386A (en) * | 2018-03-28 | 2018-09-11 | 京信通信系统（中国）有限公司 | Carrier signal identification circuit, method and communication system |
| CN115599337A (en) * | 2022-09-29 | 2023-01-13 | 聚好看科技股份有限公司（Cn） | Audio data transmission method and electronic equipment |
-
2004
- 2004-11-16 CN CNA200410084203XA patent/CN1777162A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846844A (en) * | 2015-01-29 | 2016-08-10 | 拉碧斯半导体株式会社 | Receiving apparatus and receiving method |
| CN105846844B (en) * | 2015-01-29 | 2020-12-08 | 拉碧斯半导体株式会社 | Receiving apparatus and receiving method of receiving apparatus |
| CN108521386A (en) * | 2018-03-28 | 2018-09-11 | 京信通信系统（中国）有限公司 | Carrier signal identification circuit, method and communication system |
| CN108521386B (en) * | 2018-03-28 | 2021-01-15 | 京信通信系统（中国）有限公司 | Carrier signal identification circuit, method and communication system |
| CN115599337A (en) * | 2022-09-29 | 2023-01-13 | 聚好看科技股份有限公司（Cn） | Audio data transmission method and electronic equipment |
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