CN102546002A - Infrared receiving circuit - Google Patents
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Abstract
The invention discloses an infrared receiving circuit, which comprises a pre-receiving unit and a signal processing unit. The signal processing unit comprises a controllable gain amplifying module, a band-pass filter module, a detecting and reshaping module, a detection control module and a noise judging module. By the detection control module, coding format information of input signals is extracted and is compare to the preset coding format information, and noise judging control signals are generated according to the comparison results and then output to the noise judging module. The noise judging module generates noise control signals according to the built-in noise control scheme, the noise control signals are output to the controllable gain amplifying module, so that gain magnitude of the controllable gain amplifying module is controlled. The infrared receiving circuit is capable of automatically detecting infrared command coding format transmitted in a remote control manner and being adjusted to be adaptable to different remote control coding formats, and accordingly the anti-interference performance of the circuit is improved.
Description
Technical field
The present invention relates to a kind of infrared receiving circuit, relate in particular to the different coding form is carried out adaptive infrared receiving circuit.
Background technology
At present, the infrared receiving circuit of low frequency is applied to every field, like household electrical appliances, and toy etc.
Existing in the world various remote control coding form.The different coding form has the different command interval time, and the different pulse time is represented " 1 " " 0 ".Be 22ms the blanking time such as between two instructions of the present NEC remote control coding form of main flow, and the command interval time of Sony 20bit form is 6.6ms, and the command interval time of RC5 form has more than the 89ms.Following table has been explained the infrared remote coding form of present main flow.
Traditional infrared receiving circuit to different remote control coding forms, adopt different noise suppressed patterns, and correspondence is cured as different circuits one by one.
Fig. 1 is traditional infrared receiving circuit functional block diagram.As shown in Figure 1, traditional infrared receiving circuit is by preposition receiving element, and signal processing unit constitutes, and preposition receiving element comprises: photoelectric conversion module, I/V modular converter, preparatory amplification module; Signal processing unit comprises: controllable gain amplification module, bandpass filtering modules block, detection Shaping Module and noise judge module.
Input port connects photoelectric conversion module; After photoelectric conversion module receives infrared light; Through the I/V conversion current signal is converted into voltage signal and through preparatory amplification module the voltage after changing carried out processing and amplifying; Signal after the processing and amplifying is through controllable gain amplification module adjustment signal gain, and the gain size of controllable gain amplification module is by the decision of noise judge module, with the masking noise signal; Through the signal behind the bandpass filtering modules block filtering out of band signal, handle the back through the detection Shaping Module and export from output port.
Fig. 2 is the coded format explanation sketch map of traditional infrared remote control.As shown in Figure 2, each instruction of Infrared Remote-Control Sending comprises a data time in an instruction time, the command interval time (instructing be the command interval time) blanking time between 1 and instruction 2.Each instruction is by a guidance code (not all coded format all has this guidance code), and some pulse trains and interpulse period constitute.The instruction time of every kind of remote control coding, guidance code time, pulse train and interpulse period are different.Thereby need different noise judgment mechanisms to suppress noise.This shows that the versatility of traditional infrared circuit noise inhibition mechanism is not good, can not handle multiple command coding.
The producer of infrared receiving circuit need be directed against different remote control coding forms, different noise suppression proposal is set, and further produces the circuit of different size, improves the interference free performance of infrared receiving circuit, also need provide complicated selection explanation simultaneously.
Therefore corresponding different application; The client of application end need purchase the product of different infrared receiving circuits with correspondence oneself, in case choosing is wrong, then can significantly reduce the product receiving range; Thereby caused present infrared receiving circuit of a great variety, selected complicated situation.
Summary of the invention
The technical problem that the present invention will solve provides a kind of infrared receiving circuit, and this circuit can detect the ultra-red order coded format of remote-control transmitting automatically, and adjusts, and to adapt to various remote control coding form, improves the interference free performance of circuit.
For solving the problems of the technologies described above, infrared receiving circuit of the present invention, comprise preposition receiving element, with the signal processing unit that preposition receiving element output links to each other, signal processing unit comprises: the controllable gain amplification module that links to each other with preposition receiving element output; The bandpass filtering modules block that is connected with controllable gain amplification module output; The detection Shaping Module that links to each other with the bandpass filtering modules block output; With bandpass filtering modules block output, the noise judge module that links to each other with controllable gain amplification module control end; Signal processing unit also comprises the detection control module, and its input links to each other with the output of detection Shaping Module, and its output links to each other with the control end of noise judge module.
Further, the encoding format information of the extraction of the detection control module in the infrared receiving circuit provided by the invention input signal is carried out the judgement of signal kinds.
The encoding format information of the input signal that further, the detection control module is extracted in the infrared receiving circuit provided by the invention comprises command interval time, guidance code time, the interpulse period of signal.
Further; Detection control module in the infrared receiving circuit provided by the invention has preset a kind of encoding format information of signal; Be used for comparing with the encoding format information of input signal; Generate the comparison signal, when the encoding format information of input signal with preset encoding format information not simultaneously, preset the encoding format information that encoding format information is replaced by input signal.
Further; Detection control module in the infrared receiving circuit provided by the invention comprises: first counter, second counter, the 3rd counter, coding comparator, four-counter; The output signal of detection Shaping Module is connected to the FPDP of first counter, four-counter; The output signal of four-counter is connected to the replacement port of first counter, second counter, the 3rd counter; The replacement port of four-counter is connected to power-on reset signal; The output signal of detection Shaping Module connects inverter, and inverter connects the FPDP of second counter, the 3rd counter respectively, and the clock port of first counter, second counter, the 3rd counter, four-counter connects the clock signal of carrier wave; The output port of the output port of the output port of first counter, second counter, the 3rd counter connects the coding comparator, and the output port of coding comparator is connected to the noise judge module.
Further; Detection control module in the infrared receiving circuit provided by the invention also comprises a data port, a clock port; Through FPDP input coding format information; In order to change the encoding format information that presets of said detection control module, make it with consistent through the encoding format information of FPDP input.
Further, after the detection control module in the infrared receiving circuit provided by the invention preset encoding format information and the encoding format information of importing through FPDP is consistent, the encoding format information that presets that detects control module no longer changed.
Further, the detection control module in the infrared receiving circuit provided by the invention also comprises erasable nonvolatile memory, presets encoding format information in order to storage.
The present invention increases the detection control module on the traditional infrared receiving circuit; And connect noise judge module and detection Shaping Module, and constitute feedback circuit, compare through the encoding format information characteristic of analysis input signal and with the encoding format information of the signal that presets; The control signal of generted noise judge module; In order to the judgement structure of adjustment noise judge module, reach and suppress different noises, adapt to the effect of multiple coding.The present invention makes the signal accuracy of identification higher through blanking time, guidance code time, the interpulse period of analytic signal, and anti-interference is stronger.The present invention can guarantee that through using erasable nonvolatile memory stores preset signal coded message chip does not receive the influence of on/off, steady operation.The present invention has realized that with clock port manual adjustments detects the control signal of control module output through the FPDP that detects control module, and the control signal exported of lock-in detection control module as required.Adopt above technical scheme, the present invention can substitute the infrared receiving circuit that can only receive single coded format of all kinds in the market, has realized the simplification of producing, and makes things convenient for client's use.
Description of drawings
Fig. 1 is traditional infrared receiving circuit functional block diagram;
Fig. 2 is the coded format explanation sketch map of traditional infrared remote control;
Fig. 3 is the functional block diagram of infrared receiving circuit provided by the invention;
Fig. 4 is the circuit structure diagram that detects control module in the infrared receiving circuit provided by the invention;
Fig. 5 is the functional block diagram of the manual control model infrared receiving circuit of band provided by the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the present invention is made further detailed description below in conjunction with accompanying drawing.
Fig. 3 is the functional block diagram of infrared receiving circuit provided by the invention.
As shown in Figure 3, infrared receiving circuit provided by the invention comprises: preposition receiving element and signal processing unit.Wherein, preposition receiving element comprises photoelectric conversion module, I/V modular converter, preparatory amplification module; Signal processing unit comprises controllable gain amplification module, bandpass filtering modules block, detection Shaping Module, noise judge module, detects control module.Infrared signal inputs to photoelectric conversion module, converts light signal into current signal output; This current signal becomes voltage signal through the I/V modular converter; This voltage signal is successively through pre-amplifying module and controllable gain amplification module adjustment signal gain; The control signal of controllable gain amplifier is by the decision of noise judge module, with the masking noise signal; The built-in multiple noise suppression proposal of noise judge module; Behind the adjusted signal process of gain bandpass filtering modules block filtering out of band signal, handle the back through the detection Shaping Module and export from output port; Signal after the detection shaping is imported the detection control module simultaneously; Detect control module and extract information such as the command interval time of this signal, guidance code time, interpulse period; And compare with the encoding format information that presets (detect in the control module and preset NEC remote control coding form); If find that the coded format of input is different with the coded format of storage; Then adjust the noise judge module, thus filtering noise targetedly.Owing to detect the output signal that control module need be judged the detection shaping, when system employs when receiving other coded formats, need to receive 2～3 complete instructions, could let system work normally.
Fig. 4 is the circuit structure diagram that detects control module in the infrared receiving circuit provided by the invention.
As shown in Figure 4, the detection control module realizes through the mode of digital circuit counter in this embodiment.Its particular circuit configurations comprises: the detection output signal of detection Shaping Module is connected to the FPDP EN of the first counter I1, four-counter I5, and the output signal of four-counter I5 is connected to the replacement port RST of the first counter I1, the second counter I2, the 3rd counter I3.The replacement port RST of four-counter I5 is connected to power-on reset signal.Detection output signal connects inverter, and inverter connects the FPDP EN of the second counter I2, the 3rd counter I3 respectively.The clock port CLK of the first counter I1, the second counter I2, the 3rd counter I3, four-counter I5 connects the clock signal of carrier wave.The output port CTR1 [1:0] of the output port CTR1 [5:4] of the first counter I1, the output port CTR1 [3:2] of the second counter I2, the 3rd counter I3 connects coding comparator I4.The output port CTR [6:0] of coding comparator I4 is connected to the noise judge module.Two ports of the coding timely clock of the optional connection data of comparator I4.The figure place of the output port CTR [6:0] of coding comparator I4 can be adjusted according to side circuit.
This embodiment also provides the embodiment of above-mentioned detection control module circuit working mode.
After the detection Shaping Module was judged the input of effective impulse signal, detection output signal was effective, controlled the first counter I1, four-counter I5 work.Four-counter I5 begins counting, in the time of 200ms, guarantees that the first counter I1, the second counter I2, the 3rd counter I3 are in effective operating state.The replacement port RST of four-counter I5 is connected to power-on reset signal, and four-counter I5 just started working after circuit powered on.
The first counter I1 is in order to detect the guidance code length in the coded format, and when importing greater than the useful signal of 1ms continuously, the first counter I1 exports the guidance code length information, for example shown in the following table:
| Guidance code length T 1 | Output port CTR1 [5:4] | The expression implication |
| T1＜1ms | 00 | No guidance code format encoded |
| T1＝2.4ms | 01 | The SONY format encoded |
| 2.6ms＜T1＜2.7ms | 10 | The RC6 format encoded |
| T1＝9ms | 11 | The NEC format encoded |
When detection output did not have signal, the second counter I 2 was in order to detect the command interval time in the coding.Detection method is: detect in the middle of two effective detection output signals, the longest blanking time and recording-related information export coding comparator I4 to.For example shown in the following table:
| Command interval time T 2 | Output port CTR1 [3:2] | The expression implication |
| T2＝21ms | 00 | The SONY12bit format encoded |
| T2＝15.6ms | 01 | The SONY15bit format encoded |
| T2＝6.6ms | 10 | The SONY20bit format encoded |
| T2＝89ms | 11 | The RC5 format encoded |
The 3rd counter I3 is in order to detect interpulse period.Detection method is: detect minimum blanking time between two effective detection output signals, and the output relevant information is to the comparator I4 that encodes.For example shown in the following table:
| Interpulse period T3 | Four-counter CTR1 [1:0] | The expression implication |
| T3＝444us | 00 | The RC6 format encoded |
| T3＝4902us | 01 | The RCS-80 format encoded |
| T3＝680us | 10 | The SHARP format encoded |
| T3＝1000us | 11 | The RCA format encoded |
Coding comparator I4 compares with original encoding format information according to the remote control coding format information of input.Change if find the remote control coding form that receives, then with carry-out bit CTR [6] set, in order to the judgement structure of adjustment noise judge module.
The coding comparator also can be through data and two ports of clock relevant remote control coding information of writing direct.
In the side circuit, can adjust working method as required, to adapt to more remote control coding form.
Fig. 5 is the functional block diagram of the manual control model infrared receiving circuit of band provided by the invention.
As shown in Figure 5; Detecting control module links to each other with FPDP, the clock port of outside; Through FPDP input coding format information; Can change the encoding format information that said detection control module presets, the encoding format information that said detection control module is preset is identical with the encoding format information of importing through FPDP.Under manual control model, there are two kinds of working methods.First kind of working method is: through after the manual adjustment, detect the built-in encoding format information of control module and no longer change, no matter whether the encoding format information of detected input signal is identical with the built-in encoding format information of present detection control module; Second kind of working method is: detect encoding format information that control module continues comparator input signal whether with present detection control module in the coded format of ending identical, and, carry out the adjustment of noise judge module according to comparative result.
Under situation without departing from the spirit and scope of the present invention, can also constitute many very embodiment of big difference that have.Should be appreciated that except like enclosed claim limited, the invention is not restricted at the specific embodiment described in the specification.
Claims (8)
1. infrared receiving circuit, comprise preposition receiving element, with the signal processing unit that said preposition receiving element output links to each other, said signal processing unit comprises: the controllable gain amplification module that links to each other with said preposition receiving element output; The bandpass filtering modules block that is connected with said controllable gain amplification module output; The detection Shaping Module that links to each other with said bandpass filtering modules block output; With said bandpass filtering modules block output, the noise judge module that links to each other with said controllable gain amplification module control end; It is characterized in that; Said signal processing unit also comprises the detection control module, and its input links to each other with the output of said detection Shaping Module, and its output links to each other with the control end of noise judge module; In order to judge the kind of input signal, the working method of adjustment noise judge module.
2. according to the described infrared receiving circuit of claim 1, it is characterized in that said detection control module is extracted the encoding format information of input signal and carried out the judgement of signal kinds.
3. according to the described infrared receiving circuit of claim 2, it is characterized in that the encoding format information of said input signal comprises command interval time, guidance code time, the interpulse period of signal.
4. according to the described infrared receiving circuit of claim 3; It is characterized in that; Said detection control module has preset a kind of encoding format information of signal, is used for comparing with the encoding format information of said input signal, generates the comparison signal; When the encoding format information of said input signal and saidly preset encoding format information not simultaneously, saidly preset the encoding format information that encoding format information is replaced by said input signal.
5. according to the described infrared receiving circuit of claim 4; It is characterized in that; Said detection control module comprises: first counter, second counter, the 3rd counter, coding comparator, four-counter; The output signal of said detection Shaping Module is connected to the FPDP of first counter, four-counter; The output signal of four-counter is connected to the replacement port of first counter, second counter, the 3rd counter, and the replacement port of four-counter is connected to power-on reset signal, and the output signal of said detection Shaping Module connects inverter; Inverter connects the FPDP of second counter, the 3rd counter respectively; The clock port of first counter, second counter, the 3rd counter, four-counter connects the clock signal of carrier wave, and the output port of the output port of first counter, second counter, the output port of the 3rd counter connect the coding comparator, and the output port of coding comparator is connected to the noise judge module.
6. according to the described infrared receiving circuit of claim 4; It is characterized in that; Said detection control module also comprises a data port, a clock port; Through FPDP input coding format information,, make it consistent with said encoding format information through the FPDP input in order to change the encoding format information that presets of said detection control module.
7. according to the described infrared receiving circuit of claim 6; It is characterized in that; After said detection control module preset encoding format information and said encoding format information through the FPDP input is consistent, the encoding format information that presets of said detection control module no longer changed.
8. according to each described infrared receiving circuit of claim 4～7, it is characterized in that said detection control module also comprises erasable nonvolatile memory, presets encoding format information in order to storage.
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| CN111768609A (en) * | 2020-06-29 | 2020-10-13 | 珠海格力电器股份有限公司 | Infrared signal processing method and device |
| CN112666872A (en) * | 2020-12-29 | 2021-04-16 | 南京大陆豪智能电子科技有限公司 | Conversion control system, method and equipment based on membrane switch and computer readable medium |
| CN114895284A (en) * | 2022-04-28 | 2022-08-12 | 浙江大学湖州研究院 | Large-dynamic-range laser receiving circuit system |
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