CN102332208B - Infrared remote control receiving circuit - Google Patents
Infrared remote control receiving circuit Download PDFInfo
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- CN102332208B CN102332208B CN201110301586A CN201110301586A CN102332208B CN 102332208 B CN102332208 B CN 102332208B CN 201110301586 A CN201110301586 A CN 201110301586A CN 201110301586 A CN201110301586 A CN 201110301586A CN 102332208 B CN102332208 B CN 102332208B
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Abstract
The invention discloses an infrared remote control receiving circuit, which comprises a variable grain amplifier and a limiting amplifier, a band pass filter, a first comparator, a first demodulator, an output module, a second comparator, a second demodulator, an output time detector and a logic arithmetic unit, wherein the variable grain amplifier and the limiting amplifier are used for amplifying a voltage signal and controlling voltage gain; the band pass filter carries out band pass filtering on the output signal of the limiting amplifier; the first comparator compares the output signal of the band pass filter with a first preset potential; the first demodulator demodulates the output of the first comparator; the output module outputs the output of the first demodulator; the second comparator compares the output signal of the band pass filter with a second preset potential; the second demodulator demodulates the output of the second comparator; the output time detector detects whether the time the output of low-level pulse exceeds a preset time or not; the logic arithmetic unit calculates the outputs of the second demodulator, the output time detector and the first demodulator; and the gain of the variable grain amplifier is controlled by an automatic gain controller. The circuit is free from being limited by a signal duty ratio and signal duration when being used for transmitting data signal, and the gain can be correspondingly regulated according to the variation of environment noise.
Description
Technical field
The present invention relates to a kind of infrared remote control receiving circuit, especially relate to a kind of infrared remote control receiving circuit of realizing data transmission.
Background technology
The principle of Infrared Remote-Control Sending signal is: need the signal of transmission to be modulated by high frequency carrier, launched by the infraluminescence pipe on the telepilot.The infraluminescence pipe is launched a string carrier signal (be labeled as the S1 signal, see Fig. 2) and is not launched the transmission that carrier signal (be labeled as the S0 signal, see Fig. 2) realizes the signal high-low level.
Be illustrated in figure 1 as traditional infrared remote control receiving circuit.Photodiode 11 receives light signal and converts faint electric signal into; After the amplification of polystage amplifiers such as I-V amplifier 12, variable gain amplifier 13, limiting amplifier 14, send into BPF. (being called for short BPF) 15 filterings other frequency signals except that carrier wave again.The output signal Vbpf of BPF. 15 compares at first comparer 16 and preset first predetermined level (not indicating among the figure).First comparer 16 is exported signals in 17 demodulation of first detuner, and by output module 18 outputs.
Yet except the existence of normal input signal; Also exist like multiple neighbourhood noises such as daylight, incandescent lamp, fluorescent light, electromagnetic waves; These noise signals can be coupled to the infrared remote control receiving circuit by all means, and can be amplified to output at BPF. 15.Be illustrated in figure 3 as the infrared noise signal that a fluorescent light produces.
Infrared remote control receiving circuit as shown in Figure 1 compares at second comparer 21 and preset second predetermined level (not indicating among the figure) through the output signal Vbpf of BPF. 15, and the output signal of second comparer 21 is in 22 demodulation of second detuner.
The current value through charging current source Ich and discharge current source Idch appropriately are set and first predetermined level, second predetermined level; Can noise signal, the peak value of the output signal of BPF. 15 be fluctuateed near being suppressed at second predetermined level; And less than first predetermined level; Promptly can not reach the purpose of avoiding noise in output module 18 outputs.
Shown in Figure 2 is that conventional art is being handled normal signal waveforms: during infrared remote control transmitter is the S1 signal through emission infrared pulse string; In the time of output module 18 output low levels; Second detuner 22 also can output low level, causes the Vctrl current potential also can rise, and gain descends; During not launching ultrared S0 signal, the Vctrl current potential descends, and gain is risen.
Like this, in a certain period, total dutycycle of transmission signals; Greater than the ratio of discharge current Idch and charging current Ich, discharge current Idch sum, promptly dutycycle is greater than Idch/ (Ich+Idch), after Vctrl will accumulate and rise and arrive certain degree; Gain also can correspondingly be reduced to certain degree; Make this signal at the output amplitude of BPF. 15 less than first predetermined level, cause this signal not produced the problem that follow-up signal is lost by output module 18 outputs.
Need the signal of transmission to generally include infrared reception remote signal and data-signal.
Infrared reception remote signal is to be that unit transmits with " sign indicating number ".Infrared reception remote signal has a variety of sign indicating number types, is illustrated in figure 4 as a kind of synoptic diagram of a frame full code of infrared reception remote control mode NEC sign indicating number commonly used.Various remote control mode types have all been stipulated leaving at last than long release time of each yard, and in the cycle of one " sign indicating number ", total dutycycle of signal is lower like this.Therefore conventional art can not go wrong when the infrared reception remote signal of transmission.
But data-signal is to be unit with " byte ", transmits according to certain speed, is illustrated in figure 5 as the transfer sequence synoptic diagram of a byte.For guaranteeing transfer rate, do not have at interval between the byte.Therefore bigger, the long-term situation of dutycycle appears in data-signal probably.Be illustrated in figure 6 as under conventional art, a string dutycycle is greater than the transmission course of the data-signal of the ratio of discharge current Idch and charging current Ich, discharge current Idch sum.In the starting stage, can also obtain normal waveform at the output terminal of output module; But along with the Vctrl accumulation is risen, gain continues to reduce, and after a period of time, the output terminal of output module does not have correct signal output.Therefore conventional art is not suitable for carrying out the infrared transmission of data-signal.
Summary of the invention
In order to overcome the shortcoming of conventional art, but the object of the present invention is to provide a kind of infrared remote control receiving circuit of data transmission.For this reason, the present invention takes following technical scheme:
A kind of infrared remote control receiving circuit comprises:
One I-V amplifier, the current signal Iin that is used for IR remote controller is received converts voltage signal into;
One variable gain amplifier is used to receive said I-V amplifier output, regulates the gain of I-V amplifier output;
One limiting amplifier is used to receive the output of said variable gain amplifier and amplify this output, limits the peak-peak of said variable gain amplifier output;
One BPF. is used for the output signal of limiting amplifier is carried out bandpass filtering, exports the electric signal identical with the IR remote controller frequency of carrier signal and the signal of other frequencies of filtering;
One first comparer is used for the electric signal and first predetermined level of said BPF. output are compared and export;
One first detuner is used for the output signal of said first comparer of demodulation;
One output module is used to receive the output signal of said first detuner, and exports the output terminal of infrared remote control receiver to;
One second comparer is used for the electric signal and second predetermined level of said BPF. output are compared and export;
One second detuner is used for the output signal of said second comparer of demodulation;
One output time detecting device, whether the time that is used to detect the low level pulse of first detuner or output module output surpasses a Preset Time;
One logical-arithmetic unit is used to receive the output signal of said second detuner and said output time detecting device, and carries out logical operation, the output logic control signal;
One automatic gain controller is used to receive said logic control signal, produces the gain control current potential, to control said amplifier's gain;
The value of described second predetermined level is between the output DC position and described first predetermined level of described BPF.;
The working method of said logic control signal comprises following several aspect:
(1) envelope when the output signal of said BPF. is lower than described second predetermined level, and said logical-arithmetic unit produces the logical controlling signal, controls described gain control current potential, and amplifier's gain is raise;
(2) when the envelope of the output signal of said BPF. is higher than described second predetermined level but is lower than described first predetermined level; Said logical-arithmetic unit produces the logical controlling signal; Control described gain control current potential, amplifier's gain is reduced;
(3) envelope when the output signal of said BPF. is higher than described first predetermined level; But the time of said output module output low level is during less than described Preset Time; Said logical-arithmetic unit produces the logical controlling signal; It is constant to keep described gain control current potential, and amplifier's gain is constant;
(4) envelope when the output signal of said BPF. is higher than described first predetermined level; But the time of said output module output low level greater than described Preset Time after; Described logical-arithmetic unit produces the logical controlling signal; Control described gain control current potential, amplifier's gain is reduced.
Further, said Preset Time is greater than the time span of 10 bit data signals in the data-signal and half the less than a civil power power frequency period time.
Further, said output time detecting device comprises a NMOS pipe, a charging current source, a capacitor, a comparer and one two input rejection gate; Signal identical with the output of output module of first detuner output is to this output time detecting device; The input signal of first detuner is connected to the grid of NMOS pipe and an input end of two input rejection gates; The drain electrode of NMOS pipe connects the positive input terminal of charging current source, capacitor and comparer; The negative input end of comparer is connected to a reference point position; Output terminal is connected to another input end of two input rejection gates, and two input rejection gates are output as the output signal of output time detecting device.
Further, said automatic gain controller comprises a capacitor and charging current source, a discharge current source and PMOS manages, the NMOS pipe, and an end of charging current source connects power supply, and the other end connects the source class of PMOS pipe; One end in discharge current source connects the source class of NMOS pipe, other end ground connection; The drain electrode of PMOS pipe is connected with the drain electrode and the capacitor of NMOS pipe, and output gain CONTROLLED POTENTIAL Vctrl.
Mentality of designing of the present invention is: when said output module output low level, during time of output module output low level was less than said Preset Time, said automatic gain controller produced the gain control current potential and remains unchanged, and gain also remains unchanged; After the low level time of said output module output had exceeded Preset Time, said automatic gain controller just can make the gain control current potential produce corresponding the variation, and amplifier's gain is reduced.
When noise signal occurred, the low level length that noise signal produces at said output module was always greater than described Preset Time, and therefore, described automatic gain controller can ride gain descend, thereby suppresses noise;
During the S1 signal that sends data-signal; The low level length that the S1 signal of data-signal produces at described output module is always less than described Preset Time, and therefore described during this period automatic gain controller produces the gain control current potential and can not change;
During telepilot is not launched carrier signal; Said automatic gain controller is adjusted the gain control current potential according to the neighbourhood noise situation: exceed second predetermined level like noise signal in the amplitude of described BPF.; Said second detuner has pulse signal output, and amplifier's gain reduces; Be lower than second predetermined level like noise signal in the amplitude of described BPF., said second detuner does not have pulse signal output, and amplifier's gain promotes.
It is very important for correct transmission signals and squelch that described Preset Time rationally is set:
The preset time should be greater than the time span of long signal in the data-signal.A byte transfer sequence synoptic diagram as shown in Figure 5, every byte contains 8 binary codes, adds totally 11 of a start bit (0), even parity bit and position of rests (1) during transmission.It is identical that the next byte of worst condition has 10 positions, and therefore corresponding one transfer rate confirmed just can calculate the time span of long signal.
A lot of noise signal sources, by producing like electric equipments such as electric light, TVs, the strong and weak frequency that changes of its noise signal is 2 times of civil power power frequency, is illustrated in figure 3 as the infrared noise signal that a fluorescent light produces.In order to suppress this noise-like signal, Preset Time should be less than the strong and weak one-period that changes of noise signal, and promptly a civil power power frequency period is half the.
For example, when the civil power power frequency is 50Hz, when message transmission rate is 4800bps, possibly occurs that the time span of long signal is 1000mS/4800 * 10bit=2.08mS, choosing of so preset time should be greater than 2.08mS, less than the scope of 10mS should in.
Beneficial effect of the present invention is:
According to infrared remote control receiving circuit of the present invention; Automatic gain controller can ride gain not change along with data-signal, therefore can data signals transmitted not receive the dutycycle of signal, the restriction of signal duration according to infrared remote control receiving circuit of the present invention;
According to infrared remote control receiving circuit of the present invention; Automatic gain controller can be according to the variation of neighbourhood noise and corresponding adjustment gain; Therefore the gain control electrical potential energy according to infrared remote control receiving circuit of the present invention is in appropriate level; When making circuit have good squelch performance, possesses good sensitivity.
According to infrared remote control receiving circuit of the present invention, compare traditional infrared remote control receiving circuit, only increased an output time detecting device and a logical-arithmetic unit, the chip area that takies is very little, and the cost that therefore increases almost can be ignored.
Description of drawings
Fig. 1 is the block diagram of traditional infrared reception remote control circuit;
Fig. 2 be traditional infrared reception remote control circuit under normal signal, infrared reception remote control circuit oscillogram;
Fig. 3 is the infrared noise signal synoptic diagram that a fluorescent light produces;
Fig. 4 is the synoptic diagram of a frame full code of NEC sign indicating number;
Fig. 5 is the transfer sequence synoptic diagram of a byte;
Fig. 6 is under the data-signal that traditional infrared reception remote control circuit is long in the duration, dutycycle is bigger, infrared reception remote control circuit oscillogram;
But Fig. 7 is the block diagram of the infrared reception remote-control receiving circuit embodiment of the data transmission of the present invention's proposition;
But Fig. 8 is the synoptic diagram of the output time detecting device of the infrared reception remote-control receiving circuit embodiment of the data transmission of the present invention's proposition;
But Fig. 9 is the synoptic diagram of the automatic gain controller of the infrared reception remote-control receiving circuit embodiment of the data transmission of the present invention's proposition;
But Figure 10 is the process flow diagram of the automatic gain control process of the infrared reception remote-control receiving circuit embodiment of the data transmission of the present invention's proposition;
Figure 11 is the automatic gain controller output voltage of the embodiment of the invention and the graph of a relation of gain;
But Figure 12 is the data-signal of infrared reception remote control circuit embodiment under a noise background of the data transmission of the present invention's proposition, the oscillogram of automatic gain controller;
Embodiment
Below in conjunction with accompanying drawing and embodiment content of the present invention is further specified.
As shown in Figure 7, the infrared reception remote control circuit of present embodiment comprises:
One I-V amplifier 52, the current signal Iin that IR remote controller is received converts voltage signal into; Described current signal Iin is converted light signal by photodiode 51;
One variable gain amplifier 53 receives said I-V amplifier 52 outputs, regulates the gain of I-V amplifier 52 outputs;
One limiting amplifier 54 receives the output and the amplification of said variable gain amplifier 53, limits the peak-peak of said variable gain amplifier 53 outputs;
One BPF. (be called for short BPF) 55 carries out bandpass filtering to the output signal of limiting amplifier 54, exports the electric signal Vbpf identical with the IR remote controller frequency of carrier signal, and the signal of other frequencies of filtering;
One first comparer 56, the electric signal and first predetermined level that said BPF. 55 is exported compare and export;
One first detuner 57, the output signal of said first comparer 56 of demodulation; In the present embodiment, when the envelope of the output electric signal Vbpf of said BPF. 55 during greater than described first predetermined level, the signal of first detuner, 57 outputs is a high level;
One output module 58 receives the output signal of said first detuner 57, and exports the output terminal of infrared remote control receiver to;
One second comparer 61, the electric signal and second predetermined level that said BPF. 55 is exported compare;
One second detuner 62, the output signal of said second comparer 61 of demodulation; In the present embodiment, when the envelope of the output signal Vbpf of said BPF. 55 during greater than described second predetermined level, the signal of second detuner, 62 outputs is in low level;
One output time detecting device 63, whether the time of detecting the low level pulse of said output module 58 outputs surpasses a Preset Time; Because there are clear and definite corresponding relationship in the output of output module 58 and the output of first detuner 57, therefore said output time detecting device 63 can obtain one or more input signals from the output of output module 58 or the output of first detuner 57 according to the line design demand.
Fig. 8 is a specific embodiment according to the output time detecting device 63 of an infrared reception remote control circuit of the present invention, comprises a NMOS pipe M0, a charging current source Ich0, a capacitor Cdet, a comparer A1 and one two input rejection gate Q1.In the present embodiment; Signal identical with the output of output module 58 of first detuner, 57 outputs is to this output time detecting device 63; Input signal is connected to the grid of NMOS pipe M0 and the input end of two input rejection gate Q1; The drain electrode of M0 connects the positive input terminal of charging current source Ich0, capacitor Cdet and comparer A1; The negative input end of comparer A1 is connected to a reference potential Vref, and output terminal is connected to another input end of two input rejection gate Q1, and two input rejection gate Q1 are output as the output signal of output time detecting device 63.Its working method is:
When output time detecting device 63 be input as high level the time, NMOS pipe M0 conducting, the potential difference (PD) at capacitor Cdet two ends is pulled down to the level near " 0 ", comparer A1 output low level, output time detecting device 63 is output as low level;
When output time detecting device 63 be input as low level the time; NMOS pipe M0 ends; Capacitor Cdet is recharged current source Ich0 charging; The potential difference (PD) at two ends slowly rises, be lower than in the time that capacitor Cdet is recharged capacitor Cdet capacitance, reference potential Vref magnitude of voltage product and charging current source Ich0 current value ratio (being Cdet*Vref/Ich0) before, the voltage difference at capacitor Cdet two ends is lower than Vref; Comparer A1 output low level, output time detecting device 63 is output as high level; After the time that capacitor Cdet is recharged exceeded Cdet*Vref/Ich0, the voltage difference at capacitor Cdet two ends was higher than Vref, and comparer A1 exports high level, and output time detecting device 63 is output as low level.So described Preset Time is Cdet*Vref/Ich0.
One logical-arithmetic unit 64 receives the output signal of said second detuner 62 and said output time detecting device 63 and carries out logical operation, the output logic control signal.
In the present embodiment, the logical signal of said logical-arithmetic unit 64 outputs is charging control signal Vch and discharge control signal Vdch.Like the output signal called after V62 of second detuner 62, the output signal called after V63 of output time detecting device 63, the Boolean logic formula of exporting signal so is: Vch=V62+V63, Vdch=V62.Table 1 is the input and output truth table of logical-arithmetic unit 64.
Table 1: logical-arithmetic unit 64 input and output truth tables
In the present embodiment, second predetermined level is less than said first predetermined level, the output amplitude that does not have a BPF. 55 greater than first predetermined level again less than the situation of second predetermined level, the therefore actual situation that V62=1, V63=1 can not occur.
One automatic gain controller 65 receives said logic control signal, controls the gain of said variable gain amplifier 53.
Fig. 9 is a specific embodiment according to the automatic gain controller 65 of an infrared reception remote control circuit of the present invention; Automatic gain controller 65 comprises a capacitor Cagc and charging current source Ich, a discharge current source Idch and PMOS manages M1, NMOS manages M2; The end of charging current source Ich connects power supply, and the other end connects the source class of PMOS pipe M1; The end of discharge current source Idch connects the source class of NMOS pipe M2, other end ground connection; The drain electrode of PMOS pipe M1 is connected with drain electrode and the capacitor Cagc of NMOS pipe M2, and output gain CONTROLLED POTENTIAL Vctrl.The charging signals Vch and the discharge signal Vdch of logical-arithmetic unit output in the present embodiment; Control the grid of PMOS pipe M1, the grid of NMOS pipe M2 respectively, working method is: Vch is a high level, when Vdch is high level; PMOS pipe M1 ends; NMOS pipe M2 conducting, capacitor Cagc is by discharge current source Idch discharge, and the Vctrl current potential slowly reduces; Vch is a high level, and when Vdch was low level, PMOS pipe M1 ended, and NMOS pipe M2 ends, and capacitor Cagc does not charge and do not discharge yet, and the Vctrl current potential remains unchanged; Vch is a low level, when Vdch is low level, and PMOS pipe M1 conducting, NMOS pipe M2 ends, and capacitor Cagc is recharged current source Ich charging, and the Vctrl current potential slowly raises.
But Figure 10 is the infrared reception remote control circuit according to a data transmission of the present invention, the operational flowchart of automatic gain controller:
(1) envelope when BPF. 55 output signals is lower than second predetermined level; Second detuner, 62 output high level, output time detecting device 63 output low levels, the charging control signal Vch of logical-arithmetic unit 64 outputs is a high level; Discharge control signal Vdch is a high level; Make capacitor Cagc discharge, the gain control current potential Vctrl of automatic gain controller 65 outputs reduces, and amplifier's gain is raise.
(2) when the envelope of BPF. 55 output signals is higher than second predetermined level but is lower than first predetermined level; Second detuner, 62 output low levels, output time detecting device 63 output low levels, logical-arithmetic unit 64 output signal Vch are low level; Vdch is a low level; Make capacitor Cagc charging, the gain control current potential Vctrl of automatic gain controller 65 outputs raises, and amplifier's gain is reduced.
(3) envelope when BPF. 55 output signals is higher than first predetermined level, when time of output module output low level during less than Preset Time, and second detuner, 62 output low levels; Output time detecting device 63 output high level; Logical-arithmetic unit 64 output signal Vch are high level, and Vdch is a low level, capacitor Cagc is not charged also do not discharge; The gain control current potential Vctrl of automatic gain controller 65 outputs is constant, and amplifier's gain is also constant;
(4) envelope when BPF. 55 output signals is higher than first predetermined level, and the time of output module output low level is during greater than Preset Time, second detuner, 62 output low levels; Output time detecting device 63 output low levels; Logical-arithmetic unit 64 output signal Vch are low level, and Vdch is a high level, makes capacitor Cagc charging; The gain control current potential Vctrl of automatic gain controller 65 outputs raises, and amplifier's gain reduces.
Should be noted that; In the foregoing description; Second detuner 62 can change with the high-low level of output time detecting device 63 outputs, as long as the logical operation formula of corresponding change logical-arithmetic unit 64 just can realize the result that identical amplifier's gain changes.
Figure 11 is in the present embodiment, concerns synoptic diagram between gain and the output Vctrl voltage of automatic gain controller 65: Vctrl voltage raises, the gain reduction; Vctrl voltage reduces, and gain raises.
But Figure 12 is the infrared reception remote control circuit according to a data transmission of the present invention, under a certain noise circumstance, and an oscillogram of the automatic gain of data control.Because the time of data-signal, output time detecting device 63 was output as the anti-phase of output module 58 outputs less than preset time t.During output module 58 output low levels, gain control current potential Vctrl remains unchanged.During output module 58 output high level pulses, adjust amplifier's gain according to the situation of neighbourhood noise: the amplitude like noise signal exceeds second predetermined level, second detuner, 62 output low levels; Charging signals Vch is low; PMOS pipe M1 conducting, Vdch also is low, NMOS pipe M2 turn-offs; Capacitor Cagc charging, gain control current potential Vctrl raises; Amplitude like noise signal is lower than second predetermined level, second detuner, 62 output high level, and the charging signals Vdch in the automatic gain controller 65 is high; PMOS pipe M1 turn-offs, and discharge signal Vdch becomes height, NMOS pipe M2 conducting; Capacitor Cagc discharge, gain control current potential Vctrl reduces.It is thus clear that in noise periods, gain control current potential Vctrl can remain on dynamic balance state, therefore guarantee transmitting of this data-signal Sustainable Stability.
What should be understood that is: the foregoing description is just to explanation of the present invention; Rather than limitation of the present invention; Any innovation and creation that do not exceed in the connotation scope of the present invention revise, to the change of the local structure of circuit, to the replacement or the modification of other unsubstantialities such as replacement of the type of components and parts or model, all fall within the protection domain of the present invention.
Claims (4)
1. infrared remote control receiving circuit is characterized in that comprising:
One I-V amplifier, the current signal Iin that is used for IR remote controller is received converts voltage signal into;
One variable gain amplifier is used to receive said I-V amplifier output, regulates the gain of I-V amplifier output;
One limiting amplifier is used to receive the output of said variable gain amplifier and amplify this output, limits the peak-peak of said variable gain amplifier output;
One BPF. is used for the output signal of limiting amplifier is carried out bandpass filtering, exports the electric signal identical with the IR remote controller frequency of carrier signal and the signal of other frequencies of filtering;
One first comparer is used for the electric signal and first predetermined level of said BPF. output are compared and export;
One first detuner is used for the output signal of said first comparer of demodulation;
One output module is used to receive the output signal of said first detuner, and exports the output terminal of infrared remote control receiver to;
One second comparer is used for the electric signal and second predetermined level of said BPF. output are compared and export;
One second detuner is used for the output signal of said second comparer of demodulation;
One output time detecting device, whether the time that is used to detect the low level pulse of first detuner or output module output surpasses a Preset Time;
One logical-arithmetic unit is used to receive the output signal of said second detuner and said output time detecting device, and carries out logical operation, the output logic control signal;
One automatic gain controller is used to receive said logic control signal, produces the gain control current potential, to control said amplifier's gain;
The value of described second predetermined level is between the output DC position and described first predetermined level of described BPF.;
The working method of said logic control signal comprises following several aspect:
(1) envelope when the output signal of said BPF. is lower than described second predetermined level, and said logical-arithmetic unit produces the logical controlling signal, controls described gain control current potential, and amplifier's gain is raise;
(2) when the envelope of the output signal of said BPF. is higher than described second predetermined level but is lower than described first predetermined level; Said logical-arithmetic unit produces the logical controlling signal; Control described gain control current potential, amplifier's gain is reduced;
(3) envelope when the output signal of said BPF. is higher than described first predetermined level; But the time of said output module output low level is during less than described Preset Time; Said logical-arithmetic unit produces the logical controlling signal; It is constant to keep described gain control current potential, and amplifier's gain is constant;
(4) envelope when the output signal of said BPF. is higher than described first predetermined level; But the time of said output module output low level greater than described Preset Time after; Described logical-arithmetic unit produces the logical controlling signal; Control described gain control current potential, amplifier's gain is reduced.
2. infrared remote control receiving circuit as claimed in claim 1 is characterized in that: said Preset Time is greater than the time span of 10 bit data signals in the data-signal and half the less than a civil power power frequency period time.
3. infrared remote control receiving circuit as claimed in claim 1 is characterized in that: said output time detecting device comprises a NMOS pipe, a charging current source, a capacitor, a comparer and one two input rejection gate; Signal identical with the output of output module of first detuner output is to this output time detecting device; The input signal of first detuner is connected to the grid of NMOS pipe and an input end of two input rejection gates; The drain electrode of NMOS pipe connects the positive input terminal of charging current source, capacitor and comparer; The negative input end of comparer is connected to a reference point position; Output terminal is connected to another input end of two input rejection gates, and two input rejection gates are output as the output signal of output time detecting device.
4. infrared remote control receiving circuit as claimed in claim 1; It is characterized in that: said automatic gain controller comprises a capacitor and charging current source, a discharge current source and PMOS manages, the NMOS pipe; One end of charging current source connects power supply, and the other end connects the source class of PMOS pipe; One end in discharge current source connects the source class of NMOS pipe, other end ground connection; The drain electrode of PMOS pipe is connected with the drain electrode and the capacitor of NMOS pipe, and output gain CONTROLLED POTENTIAL Vctrl.
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| CN105869382A (en) * | 2015-02-10 | 2016-08-17 | 东莞德可森电子科技有限公司 | Infrared remote control receiver |
| CN106997660B (en) * | 2017-03-31 | 2023-11-03 | 泉芯电子技术(深圳)有限公司 | Infrared receiver and gain control method thereof |
| CN109708729B (en) * | 2018-12-14 | 2020-10-20 | 金卡智能集团股份有限公司 | Automatic gain adjustment method for metering signal of ultrasonic meter and ultrasonic gas meter |
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| CN2629146Y (en) * | 2003-03-10 | 2004-07-28 | 钟玉兰 | Infrared remote control receiver |
| CN101123035A (en) * | 2006-08-11 | 2008-02-13 | 上海奇码数字信息有限公司 | Remote control receiving device and method based on infrared |
| CN101620779A (en) * | 2008-07-01 | 2010-01-06 | 马洪生 | Definable computer infrared remote control receiver |
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