CN102546002B - Infrared receiving circuit - Google Patents
Infrared receiving circuit Download PDFInfo
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- CN102546002B CN102546002B CN201010587837.2A CN201010587837A CN102546002B CN 102546002 B CN102546002 B CN 102546002B CN 201010587837 A CN201010587837 A CN 201010587837A CN 102546002 B CN102546002 B CN 102546002B
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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 different coding form is carried out to adaptive infrared receiving circuit.
Background technology
At present, the infrared receiving circuit of low frequency is applied to every field, as household electrical appliances, and toy etc.
Existing various remote control coding form in the world.Different coding form has the different command interval time, and the different burst lengths represents " 1 " " 0 ".Such as be 22ms the interval time between two instructions of the current NEC remote control coding form of main flow, the command interval time of Sony 20bit form is 6.6ms, and the command interval time of RC5 form has more than 89ms.Following table has illustrated the infrared remote coding form of current main flow.
Traditional infrared receiving circuit, for different remote control coding forms, adopts different noise suppressed patterns, and correspondence is cured as different circuit 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 forms, and preposition receiving element comprises: photoelectric conversion module, I/V modular converter, pre-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, photoelectric conversion module receives after infrared light, by I/V, change current signal is converted to voltage signal and through pre-amplification module, the voltage after changing is amplified to processing, the signal amplifying after processing is adjusted signal gain through controllable gain amplification module, the gain size of controllable gain amplification module is determined by noise judge module, with shielding noise signal, signal after bandpass filtering modules block filtering out of band signal, from output port exports after processing by detection Shaping Module.
Fig. 2 is the coded format explanation schematic diagram of traditional infrared remote control.As shown in Figure 2, each instruction of Infrared Remote-Control Sending comprises a data time within an instruction time, the command interval time (being the command interval time interval time between instruction 1 and instruction 2).Each instruction is by a guidance code (not all coded format has this guidance code), and some pulse trains and interpulse period form.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.As can be seen here, it is not good that traditional infrared circuit noise suppresses machine-processed versatility, can not process multiple instruction encoding.
The producer of infrared receiving circuit need arrange different noise suppression proposal, and further produce the circuit of different size for different remote control coding forms, improves the interference free performance of infrared receiving circuit, also needs to provide complicated selection explanation simultaneously.
Therefore corresponding different application, the client of application end need to purchase different infrared receiving circuits with the product of correspondence oneself, once choosing is wrong, can significantly reduce product receiving range, thereby caused current infrared receiving circuit of a great variety, selected complicated situation.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of infrared receiving circuit, and this circuit can detect the ultra-red order coded format of remote-transmitter 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 is connected, signal processing unit comprises: the controllable gain amplification module being connected with preposition receiving element output; The bandpass filtering modules block being connected with controllable gain amplification module output; The detection Shaping Module being connected with bandpass filtering modules block output; With bandpass filtering modules block output, the noise judge module that is connected with controllable gain amplification module control end; Signal processing unit also comprises detection control module, and its input is connected with the output of detection Shaping Module, and its output is connected with the control end of noise judge module.
Further, the encoding format information of the extraction of the detection control module in infrared receiving circuit provided by the invention input signal is carried out the judgement of signal kinds.
Further, the encoding format information that detects the input signal that control module extracts in infrared receiving circuit provided by the invention comprises command interval time, guidance code time, the interpulse period of signal.
Further, a kind of encoding format information of signal that detection control module in infrared receiving circuit provided by the invention is preset, for comparing with the encoding format information of input signal, generate comparison signal, when the encoding format information of input signal is different from preset encoding format information, preset encoding format information is replaced by the encoding format information of input signal.
Further, detection control module in infrared receiving circuit provided by the invention comprises: the first counter, the second counter, the 3rd counter, coding comparator, four-counter, the output signal of detection Shaping Module is connected to the first counter, the FPDP of four-counter, the output signal of four-counter is connected to the first counter, the second counter, the replacement port of 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, inverter connects respectively the second counter, the FPDP of the 3rd counter, the first counter, the second counter, the 3rd counter, the clock port of four-counter connects the clock signal of carrier wave, the output port of the first counter, the output port of the second counter, the output port of the 3rd counter connects coding comparator, the output port of coding comparator is connected to noise judge module.
Further, detection control module in infrared receiving circuit provided by the invention also comprises a FPDP, a clock port, by FPDP input coding format information, in order to change the preset encoding format information of described detection control module, make it consistent with the encoding format information of inputting by FPDP.
Further, after the preset encoding format information of detection control module in infrared receiving circuit provided by the invention is consistent with the encoding format information of inputting by FPDP, the preset encoding format information that detects control module no longer changes.
Further, the detection control module in infrared receiving circuit provided by the invention also comprises erasable nonvolatile memory, in order to store preset encoding format information.
The present invention increases detection control module on traditional infrared receiving circuit, and connect noise judge module and detection Shaping Module, form feedback circuit, by analyzing the encoding format information feature of input signal and comparing with the encoding format information of preset signal, the control signal of generted noise judge module, in order to adjust the judgement structure of noise judge module, reach and suppress different noises, adapt to the effect of Multi-encoding.The present invention makes signal accuracy of identification higher by interval time, guidance code time, the interpulse period of analytic signal, and anti-interference is stronger.The present invention, by using erasable nonvolatile memory storage preset signal coded message, can guarantee that chip is not subject to the impact of on/off, steady operation.The present invention is by detecting the FPDP of control module and the control signal that clock port has been realized the output of manual adjustments detection control module, and the control signal that lock-in detection control module is exported 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 facilitates client's use.
Accompanying drawing explanation
Fig. 1 is traditional infrared receiving circuit functional block diagram;
Fig. 2 is the coded format explanation schematic diagram of traditional infrared remote control;
Fig. 3 is the functional block diagram of infrared receiving circuit provided by the invention;
Fig. 4 detects the circuit structure diagram of control module in 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, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
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, pre-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, and light signal is converted to current signal output; This current signal becomes voltage signal through I/V modular converter; This voltage signal is successively adjusted signal gain through pre-amplifying module and controllable gain amplification module; The control signal of controllable gain amplifier is determined by noise judge module, to shield noise signal; The built-in multiple noise suppression proposal of noise judge module; Signal after gain is adjusted, after bandpass filtering modules block filtering out of band signal, from output port is exported after processing by detection Shaping Module; Signal after detection shaping is inputted detection control module simultaneously; Detect control module and extract the information such as the command interval time of this signal, guidance code time, interpulse period, and compare with preset encoding format information (detecting preset NEC remote control coding form in control module), if find that the coded format of input is different from the coded format of storage, adjust noise judge module, thus filtering noise targetedly.Owing to detecting control module and need to judge the output signal of detection shaping, when system employs is when receiving other coded formats, need to receive 2～3 complete instructions, could allow system work normally.
Fig. 4 detects the circuit structure diagram of control module in infrared receiving circuit provided by the invention.
As shown in Figure 4, in this embodiment, detecting the mode of control module by digital circuit counter realizes.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 respectively the FPDP EN of the second counter I2, the 3rd counter I3.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[5:4 of the first counter I1], the output port CTR1[3:2 of the second counter I2], the output port CTR1[1:0 of the 3rd counter I3] connect coding comparator I4.The output port CTR[6:0 of coding comparator I4] be connected to noise judge module.The coding optional connection data of comparator I4 and two ports of clock.The output port CTR[6:0 of coding comparator I4] figure place can adjust according to side circuit.
This embodiment also provides the embodiment of above-mentioned detection control module circuit working mode.
When detection Shaping Module, judge after the input of effective impulse signal, detection output signal is effective, controls the first counter I1, four-counter I5 work.Four-counter I5 starts counting, within 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 after circuit powers on, four-counter I5 just starts working.
The first counter I1 is in order to detect the guidance code length in coded format, and when having the useful signal input that is greater than continuously 1ms, the first counter I1 exports guidance code length information, and example is as shown in the table:
| Guidance code length T 1 | Output port CTR1[5:4] | Represent implication |
| T1＜1ms | 00 | Without guidance code form, encode |
| T1＝2.4ms | 01 | SONY form coding |
| 2.6ms＜T1＜2.7ms | 10 | RC6 form coding |
| T1＝9ms | 11 | NEC form coding |
When detection output does not have signal, the second counter I 2 is in order to detect the command interval time in coding.Detection method is: detect in the middle of two effective detection output signals, the longest interval time recording-related information export coding comparator I4 to.Example is as shown in the table:
| Command interval time T 2 | Output port CTR1[3:2] | Represent implication |
| T2＝21ms | 00 | SONY12bit form coding |
| T2＝15.6ms | 01 | SONY15bit form coding |
| T2＝6.6ms | 10 | SONY20bit form coding |
| T2＝89ms | 11 | RC5 form coding |
The 3rd counter I3 is in order to detect interpulse period.Detection method is: detect interval time minimum between two effective detection output signals, and export relevant information to the comparator I4 that encodes.Example is as shown in the table:
| Interpulse period T3 | Four-counter CTR1[1:0] | Represent implication |
| T3＝444us | 00 | RC6 form coding |
| T3＝4902us | 01 | RCS-80 form coding |
| T3＝680us | 10 | SHARP form coding |
| T3＝1000us | 11 | RCA form coding |
Coding comparator I4, according to the remote control coding format information of input, contrasts with original encoding format information.If find that the remote control coding form receiving changes, by carry-out bit CTR[6] set, in order to adjust the judgement structure of noise judge module.
Coding comparator also can be by data and two ports of clock relevant remote control coding information of writing direct.
In side circuit, can adjust as required working method, 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 is connected with outside FPDP, clock port, by FPDP input coding format information, can change the preset encoding format information of described detection control module, make the preset encoding format information of described detection control module identical with the encoding format information of inputting by FPDP.Under manual control model, there are two kinds of working methods.The first working method is: after manual adjustment, detect the built-in encoding format information of control module and no longer change, no matter whether built-in with current detection control module the encoding format information of detected input signal encoding format information be identical; The second working method is: whether the encoding format information that detects control module continuation comparator input signal is identical with the coded format of stopping in current detection control module, and according to comparative result, carries out the adjustment of noise judge module.
Without departing from the spirit and scope of the present invention in the situation that, can also form many embodiment that have very big difference.Should be appreciated that except as defined by the appended claims, the invention is not restricted at the specific embodiment described in specification.
Claims (6)
1. an infrared receiving circuit, comprise preposition receiving element, with the signal processing unit that described preposition receiving element output is connected, described signal processing unit comprises: the controllable gain amplification module being connected with described preposition receiving element output; The bandpass filtering modules block being connected with described controllable gain amplification module output; The detection Shaping Module being connected with described bandpass filtering modules block output; With described bandpass filtering modules block output, the noise judge module that is connected with described controllable gain amplification module control end; It is characterized in that, described signal processing unit also comprises detection control module, and its input is connected with the output of described detection Shaping Module, and its output is connected with the control end of noise judge module, in order to judge the kind of input signal, adjust the working method of noise judge module;
Described detection control module is extracted the encoding format information of input signal and is carried out the judgement of signal kinds;
The encoding format information of described input signal comprises command interval time, guidance code time, the interpulse period of signal.
2. according to infrared receiving circuit claimed in claim 1, it is characterized in that, a kind of encoding format information of signal that described detection control module is preset, for comparing with the encoding format information of described input signal, generate comparison signal, when the encoding format information of described input signal is different from described preset encoding format information, described preset encoding format information is replaced by the encoding format information of described input signal.
3. according to infrared receiving circuit claimed in claim 2, it is characterized in that, described detection control module comprises: the first counter, the second counter, the 3rd counter, coding comparator, four-counter, the output signal of described detection Shaping Module is connected to the first counter, the FPDP of four-counter, the output signal of four-counter is connected to the first counter, the second counter, the replacement port of the 3rd counter, the replacement port of four-counter is connected to power-on reset signal, the output signal of described detection Shaping Module connects inverter, inverter connects respectively the second counter, the FPDP of the 3rd counter, the first counter, the second counter, the 3rd counter, the clock port of four-counter connects the clock signal of carrier wave, the output port of the first counter, the output port of the second counter, the output port of the 3rd counter connects coding comparator, the output port of coding comparator is connected to noise judge module.
4. according to infrared receiving circuit claimed in claim 2, it is characterized in that, described detection control module also comprises a FPDP, a clock port, by FPDP input coding format information, in order to change the preset encoding format information of described detection control module, make it consistent with the described encoding format information of inputting by FPDP.
5. according to infrared receiving circuit claimed in claim 4, it is characterized in that, after the preset encoding format information of described detection control module is consistent with the described encoding format information of inputting by FPDP, the preset encoding format information of described detection control module no longer changes.
6. according to the infrared receiving circuit described in claim 2～5 any one, it is characterized in that, described detection control module also comprises erasable nonvolatile memory, in order to store preset encoding format information.
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| CN111768609B (en) * | 2020-06-29 | 2021-07-23 | 珠海格力电器股份有限公司 | Infrared signal processing method and device |
| CN112666872B (en) * | 2020-12-29 | 2022-07-26 | 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 |
| CN114895284B (en) * | 2022-04-28 | 2022-12-27 | 浙江大学湖州研究院 | Large-dynamic-range laser receiving circuit system |
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| CN1983876A (en) * | 2005-12-15 | 2007-06-20 | Ad技术有限公司 | An infrared-ray receiver |
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