CN1929545B - Correction method for TV scanning linearity aberration - Google Patents
Correction method for TV scanning linearity aberration Download PDFInfo
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- CN1929545B CN1929545B CN2006100615393A CN200610061539A CN1929545B CN 1929545 B CN1929545 B CN 1929545B CN 2006100615393 A CN2006100615393 A CN 2006100615393A CN 200610061539 A CN200610061539 A CN 200610061539A CN 1929545 B CN1929545 B CN 1929545B
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Abstract
This invention discloses one correction method of television scan linear arterial part, which comprises the following steps: processing digital technique for analogue television image signal and converting analogue image signals into digital image signals through A/D conversion; processing digital image signal data for grouping and adding signal and outputting code signal; finally processing digital image signals.
Description
[technical field]
The present invention relates to technical field of television sets, particularly a kind of antidote of TV scanning linearity aberration.
[background technology]
The CRT television set of Chu Xianing in the market, progressively to the development of aspects such as ultra-thin, large-screen, digitlization, high definition, for ultrathin television set, because the shortening of picture tube, the angle of corresponding requirements scan deflection increases, and row, field scan bias distortion are also increased.Therefore, people are improving constantly the requirement of CRT television scanning distortion index.Figure 1 shows that the fundamental diagram of existing ordinary color tv set line-scan circuit, wherein, L1 is a saturation inductors, also claim the line scanning saturation distortion to correct inductance, its inductance value is relevant with the size of current that flows through deflecting coil, and when the electric current that flows through deflecting coil reached maximum, inductance value also became minimum value, therefore, it can play compensating action to the line scanning saturation distortion; C3 is the line-sweep voltage output coupling capacitor, also be that electric capacity is corrected in S-distortion, the electric capacity both end voltage discharges and recharges change procedure, and just in time to be positioned at moment at two ends corresponding with horizontal scanning line, the rate variations of capacitor charging/discharging is very big to the speed influence of line scanning, therefore, utilize that it is is just discharging and recharging, the variation characteristic of cosine just in time can be corrected S shape scanner distortion; L2 is a filter inductance, or is called capable pincushion distortion correcting signal coupling inductance, and C4 is a filter capacitor, and the main effect of L2 and C4 is that parabola wave (negative sense) is superimposed among the line-scan circuit effectively, corrects to reach to row pincushion distortion.Though from the fundamental diagram of this line-scan circuit as can be seen its line scanning distortion circuit for rectifying the line scanning distortion is corrected very effective, but debugging is pretty troublesome in the product lot quantity production process, because the parameter of device is generally all non-adjustable in the scanner distortion circuit for rectifying, when having deviation, parameter can only change components and parts singly, production efficiency is very low, and is difficult to guarantee that machine works is in optimum state.In addition, the complicated maintenance difficult of circuit, operating efficiency is very low, and nearly 20% scanning power output loss in vain will increase raw-material cost of machine and production cost like this on the device of circuit for rectifying.
[summary of the invention]
The object of the present invention is to provide a kind of above-mentioned shortcoming that overcomes, improve CRT television set line linearity distortion index performance, improve the antidote of production efficient and the TV scanning linearity aberration that reduces cost.
For achieving the above object, the antidote of TV scanning linearity aberration of the present invention comprises the steps:
A. the simulated television picture signal is carried out digital technology and handle, analog picture signal is converted to data image signal, then data image signal is stored and data processing by the A/D conversion;
B. data image signal is encoded, by going to the capable synchronizing signal of dividing into groups and add of digital picture signal data, outupt coded signal;
C. coding output digital image signal is carried out phase shift.
Compared to prior art, the antidote of TV scanning linearity aberration of the present invention is by adopting the data image signal treatment technology, phase place to picture signal changes, thereby improves CRT television set line linearity distortion index performance, improves production efficient and reduces cost.
[description of drawings]
Fig. 1 is the fundamental diagram of existing ordinary color tv set line-scan circuit;
Fig. 2 is a schematic diagram of the present invention;
Fig. 3 is that the present invention carries out the workflow diagram that digital technology is handled to the simulated television picture signal;
Fig. 4 is that the present invention carries out the schematic diagram that digital technology is handled to the simulated television picture signal;
Fig. 5 is the schematic diagram that the present invention adopts TV remote controller debugging line scanner distortion;
Fig. 6 is that the present invention adopts the phase place that changes the coding output control pulse to improve the fundamental diagram of line scanning distortion;
Fig. 7 is the fundamental diagram that another embodiment of the present invention adopts Schmidt trigger circuit to carry out the pulse phase shift;
Fig. 7 a is the oscillogram of operation principle embodiment illustrated in fig. 7.
[embodiment]
See also shown in Figure 2, the antidote of TV scanning linearity aberration of the present invention is by changing the phase place between every group pulse mutually, make the mutual distance of a plurality of pulse signals different, distance between two pulse signals of the local correspondence that vertical bar is wide is just smaller, and the distance between narrow two the local corresponding pulse signals of vertical bar is just big, and various like this line scanning distortions just can obtain correcting.
The phase place that changes the simulated television picture signal must adopt the data image signal treatment technology, at first change by A/D, analog picture signal is converted to data image signal, could store data image signal then, digital processing such as computing, coding.Figure 3 shows that the simulated television picture signal is carried out the workflow diagram that digital technology is handled, the simulated television picture signal is at first changed by A/D, analog picture signal is converted to data image signal, could store and data processing data image signal then, at last the data of data image signal are carried out output encoder, and carry out the conversion of D/A digital-to-analog, data image signal is converted to analog picture signal.
See also shown in Figure 4ly, the picture signal digital processing mainly includes A/D converter, cpu central processing unit, Memory memory, D/A converter.At first analog picture signal is carried out the A/D conversion, analog picture signal is transformed into data image signal, data image signal is by an input port input of cpu central processing unit, be generally input in parallel, be stored among inner certain register of cpu central processing unit, carry out a series of software programs then, by operations such as address bus, data/address bus, control buss, data conversion storage among inner certain register of cpu central processing unit is stored among the Memory memory, and then the data of storing in the Memory memory are further carried out logical process.
When cpu central processing unit will deposit the data in the register in the Memory memory, CPU at first will send address signal (A1-An) to Memory, and data are sent on the data/address bus (D1-Dn), and then send out chip select signal (C) and written request signal (W) to Memory, after Memory was ready to, CPU sent to Memory and carries out signal (E); When cpu central processing unit need be certain register in the cpu central processing unit of the data conversion storage in the Memory memory, when preparation is handled data, same CPU at first will send address signal (A1-An) to Memory, with chip select signal (C) and reading request signal (R), after being ready to Deng Memory, CPU sends to Memory and carries out signal (E), Memory sends to data on the data/address bus (D1-Dn) at once, cpu central processing unit reads in accumulator to data from data/address bus then, and unloading is gone among certain register.
Need take a sample to analog picture signal when analog picture signal is transformed into data image signal, sample frequency is generally about 3 times of picture signal highest frequency, and the sampling frequency of pal television or standard definition television picture signal is generally 13.5MHz.Also need to carry out quantization encoding after the picture signal sampling, just can become data image signal.
It all is that follow procedure carries out generally that picture signal is carried out the digital technology processing, and executive program all has been stored among certain inner or external program storage of cpu central processing unit in advance.Generally still be stored among the Memory memory through the data after the digital processing, have only the data of instant processing or the data that need at once to export just can be stored among certain register of cpu central processing unit inside.To carrying out encoding process through the data image signal number after the digital processing, by row the digital picture signal data is divided into groups and adds synchronizing signal, and then press certain speed data certain register output from cpu central processing unit, perhaps cpu central processing unit outputs to code signal earlier among the buffer storage earlier, and then allow code signal from the output of buffering memory, data deposit in and export like this can not need to have improved the real-time working efficient of cpu central processing unit synchronously.
It generally all is to adopt the DSP digital signal processor of multibus and multi-CPU structure or the application-specific integrated circuit (ASIC) of OSC band embedded OS that television image signal is handled, in the picture signal digital processing shown in Figure 4, the input of CPU data image signal, output port all are to adopt input in parallel, output form, and the single line bit rate output can reduce by 10 times nearly like this.
Carry out the code check that a bit of software program changes the output digital image signal, the various line scanning distortions that can debug the CRT television image in cpu central processing unit.Wherein, content in the executive program (software) should include the various supplemental characteristics of line scanning distortion, the data of the various parameters of these line scanning distortions generally all are when production of machinery, by programmer data are write among the inner or external program storage of cpu central processing unit, if the data of parameter are made amendment, can only be by computer or the microprocessor that is used for specially reading and writing data carry out.In addition, also can carry out with the remote controller of television set.
Figure 5 shows that the fundamental diagram of the employing TV remote controller debugging line scanner distortion that adopts remote control CPU independent process remote signal.In fact, the CPU of a band remote signal input interface is arranged all in the general television set, therefore, the remote control CPU among Fig. 5 also can be included among the CPU of general television set.Through the decoded most of television set line scanning distortion tune-up data of remote control CPU, all be to be stored among the inside or external memorizer of remote control CPU generally, and most of data are handled by remote control CPU.Conversely, data image signal is handled CPU and is just carried out the instruction that remote control CPU sends passively, and certain line number word image signal that coding is exported carries out phase shift work.
Coding output digital image signal is carried out phase shift, in digital circuit, be equivalent to only need carry out phase shift memory or register read control signal.The phase place of change coding output control pulse shown in Figure 6 is improved line scanning distortion fundamental diagram.Wherein, the phase place that changes control circuit output pulse just can change the phase place of buffer storage circuit output digital image signal, thereby reaches the purpose of improving the line scanning distortion parameter.
The phase place of the output pulse of control circuit not only will be subjected to pining down of input signal phase place, and the amplitude or the phase place that also will be subjected to another comparison signal (modulation signal) simultaneously pin down.Therefore, just can change the phase place that control circuit is exported pulse by amplitude or the phase place that changes comparison signal, go to control the output of buffer storage circuit data image signal then with control circuit output pulse, just can obtain a data image signal that improves the line scanning distortion parameter.
From another perspective, the operation principle of control circuit is more as an impulse phase modulator, and high-frequency pulse signal is handled CPU output by data image signal, and modulation signal is provided by remote control CPU.Therefore, realize that the approach of this function is many, as: basic circuits for triggering etc. can realize that pulse signals is delayed time, the function of phase shift when adopting Schmidt trigger circuit (also being emitter-base bandgap grading coupling bistable circuit), XX555.Realize a square-wave pulse is carried out phase shift or time-delay is easy to realize with circuit, simple principle is exactly earlier square-wave pulse to be carried out integration, allow it become a sawtooth waveforms, and then compare by a voltage comparator and it with a reference voltage, when sawtooth voltage rises above reference voltage, voltage comparator just has output, change the amplitude of reference voltage or the climbing of change sawtooth voltage, can change the phase place of output pulse, at last the impulse waveform that shaping just can obtain various different parameters be carried out in voltage comparator output pulse.
Figure 7 shows that another embodiment of the present invention, is to adopt Schmidt trigger circuit to carry out the pulse phase shift, and Fig. 7 a is its oscillogram.Wherein, data image signal output buffer storage circuit adopts the higher and better simply register of control ratio of speed, generally can select D flip-flop for use, data begin to read in memory when lock-out pulse VP arrives, and being saved in next synchronous pulse VP when arriving, the data of memory just begin to upgrade.Data image signal is handled the storage data sync pulse CP (shown in Fig. 7 a-a) of CPU output by 1 output of a resistance R, and then through capacitor C 1 integration, square wave is become sawtooth waveforms (shown in Fig. 7 a-b), sawtooth waveforms is sent to the modulation voltage VD that exports with the remote control cpu circuit in the Schmidt trigger circuit and compares, when the amplitude of sawtooth waveforms is higher than voltage VD, Schmidt trigger circuit is triggered and exports a positive square wave VP (shown in Fig. 7 a-c), and being fed to D flip-flop as storage data sync pulse VP, the data image signal storage that allows D flip-flop that data image signal is handled CPU output is got off.The data of D flip-flop storage do not need in addition increase control signal just can directly read among the D/A converter again, D/A converter also is input in parallel, but its output pulse that to be a string amplitude identical with the analog picture signal envelope (series connection output) just can obtain behind smothing filtering and received image signal shape and the essentially identical analog picture signal of character.
Change the value of remote control cpu circuit output voltage V D, can change the phase place of memory lock-out pulse VP.The value of remote control cpu circuit output voltage V D can realize by software program for execution.Its principle is in advance the parameter of the corresponding distortion of all pixels of a width of cloth display image to be converted to storage among the memory of remote control CPU control, that is: the image fault data are made the tables of data that can inquire about in proper order according to row, field sync signal, and be stored among the memory.Remote control CPU can come tables of data is inquired about according to the order of row, field sync signal, and sense data, just can output voltage V D after the D/A conversion.Hence one can see that, the value of voltage VD is that the order of corresponding row, field sync signal constantly changes, row, field sync signal can be handled CPU by communication and the output of control signal bus by data image signal, TC among Fig. 7 and Fig. 7 a communicates and the synchronous control signal bus between two CPU, communicate and transmit synchronous control signal between two CPU, wherein also comprise row, field sync signal.
The VD voltage of remote control cpu circuit output also can produce by pulse modulated method in addition, changes average value of output voltage by the number that changes the output pulse.With S-distortion is example, and at the rightmost of horizontal scanning line, the phase place of correcting the control impuls of line scanning distortion should be to lag behind, and corresponding VD magnitude of voltage is the highest, and at this moment, the pulse number of remote control cpu circuit output should be the highest; And at the Far Left of horizontal scanning line, the phase place of correcting the control impuls of line scanning distortion should be in advance, and corresponding VD magnitude of voltage is minimum, and at this moment, the pulse number of remote control cpu circuit output should also be minimum.Therefore, when horizontal scanning line from the Far Left of screen at first, the pulse number of remote control cpu circuit output also progressively constantly increases with certain speed (corresponding with distortion parameter) from minimum, arriving the pulse number of exporting when rightmost finishes up to horizontal scanning line ends for being up to, the output pulse just can obtain exporting the mean value of pulse, that is: VD magnitude of voltage through filtering again.Obviously, the pulse number of remote control cpu circuit output is The more the better, and like this, VD changes to the highlyest from minimum, and the relative variation of pulse number is just smaller, and output voltage ripple is relative also very little, and it is more little that this is equivalent to quantization step, and quantization noise is also more little.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (8)
1. the antidote of a TV scanning linearity aberration is characterized in that comprising the steps:
A. the simulated television picture signal is carried out digital technology and handle, analog picture signal is converted to data image signal, then data image signal is stored and data processing by the A/D conversion; Described data image signal is by the input port input of CPU, be stored among the inner register of CPU, carry out a series of software programs then, by address bus, data/address bus, control bus, data conversion storage among inner this register of CPU is stored among the memory, and then the data of storing in the memory are carried out logical process;
B. to encoding through the data image signal after the data processing, CPU carries out the code check that one section software program changes the output digital image signal, by going to the capable synchronizing signal of dividing into groups and add of digital picture signal data, outupt coded signal;
C. coding output digital image signal is carried out phase shift, described phase shift realizes in the following manner: the control circuit that data image signal output buffer storage circuit and change impulse phase are provided, by changing the phase place of control circuit output pulse, change the phase place of buffer storage circuit output digital image signal.
2. the antidote of TV scanning linearity aberration as claimed in claim 1, it is characterized in that: the picture signal digital processing unit of carrying out described picture signal digital processing includes A/D converter, CPU, memory and D/A converter part.
3. the antidote of TV scanning linearity aberration as claimed in claim 2 is characterized in that: it is that program software by being stored in the inner or external program storage inside of CPU in advance carries out that the digital technology of picture signal is handled.
4. as the antidote of any one described TV scanning linearity aberration in the claim 1 to 2, it is characterized in that: the data of the various parameters of line scanning distortion are write the inner or external program storage inside of CPU, thereby by computer or the microprocessor that is used for specially reading and writing data just can make amendment to supplemental characteristic.
5. the antidote of TV scanning linearity aberration as claimed in claim 4 is characterized in that: as remote control CPU, utilize TV remote controller to carry out line scanning distortion debugging the CPU that has the remote signal input interface in the television set.
6. the antidote of TV scanning linearity aberration as claimed in claim 1 is characterized in that: described control circuit output impulse phase is subjected to the amplitude of input signal phase place and another comparison signal or pining down of phase place.
7. the antidote of TV scanning linearity aberration as claimed in claim 1 is characterized in that: the high-frequency impulse of described control circuit is handled CPU output by data image signal, and described comparison signal is provided by remote control CPU.
8. the antidote of TV scanning linearity aberration as claimed in claim 1 is characterized in that: the phase shift of described data image signal can realize by Schmidt trigger circuit or 555 o'clock base circuits for triggering.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW538627B (en) * | 2000-08-14 | 2003-06-21 | Lg Electronics Inc | Apparatus and method for compensating clock phase of monitor |
| CN1433217A (en) * | 2001-08-31 | 2003-07-30 | 汤姆森特许公司 | Raster distortion corrector |
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| TW538627B (en) * | 2000-08-14 | 2003-06-21 | Lg Electronics Inc | Apparatus and method for compensating clock phase of monitor |
| CN1433217A (en) * | 2001-08-31 | 2003-07-30 | 汤姆森特许公司 | Raster distortion corrector |
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