CN104410941A - Phase-shift processing based automatic-gain wide-range audio processing system - Google Patents
Phase-shift processing based automatic-gain wide-range audio processing system Download PDFInfo
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- CN104410941A CN104410941A CN201410691209.7A CN201410691209A CN104410941A CN 104410941 A CN104410941 A CN 104410941A CN 201410691209 A CN201410691209 A CN 201410691209A CN 104410941 A CN104410941 A CN 104410941A
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Abstract
The invention discloses a phase-shift processing based automatic-gain wide-range audio processing system. The audio processing system is characterized by comprising a signal acquisition circuit, a signal debugging circuit, a signal processing circuit, an automatic-gain control circuit, an audio processing circuit and a phase-shift processing circuit, wherein both the signal debugging circuit and the signal processing circuit are connected with the signal acquisition circuit, the automatic-gain control circuit is connected with the signal processing circuit and the signal debugging circuit, the audio processing circuit is connected with the automatic-gain control circuit, the phase-shift processing circuit is connected with the audio processing circuit and the automatic-gain control circuit. The phase-shift processing circuit comprises a phase-shift chip U1, a triode VT5, a triode VT6, a resistor R16 and the like, wherein one end of the resistor R16 is connected with a VCC+ pin of the phase-shift chip U1 while the other end of the resistor R16 is connected with an IN1 pin of the phase-shift chip U1. By the aid of the phase-shift processing circuit, audio frequency can be more stable when the audio processing system achieves wide-range gain control.
Description
Technical field
The present invention relates to a kind of audio frequency processing system, specifically refer to based on phase shift process from gain wide region audio frequency processing system.
Background technology
Audio reception device has been indispensable instrument in daily life, study, work, but in use for some reason, as switching channels, broadcast advertisement etc., there will be the situation that volume differs when signal exports, have a strong impact on the audibility of user.Producing the larger main cause of this volume difference is that the amplitude that audio signal inputs is inconsistent, and solution carries out gain control exactly.But current gain audio frequency control treatment system is analog circuit detection control, its Analog Circuit Design is relatively loaded down with trivial details, and when the gain realizing relative broad range controls, audio frequency is unstable, affects audibility.
Summary of the invention
The object of the invention is to solve current from the loaded down with trivial details and defect that the is audio frequency instability when realizing wide region gain and controlling of gain Design of Digital Audio Processing System, provide a kind of based on phase shift process from gain wide region audio frequency processing system.
Object of the present invention by following technical proposals reality: based on phase shift process from gain wide region audio frequency processing system, by signal acquisition circuit, the signal debug circuit be all connected with signal acquisition circuit and signal processing circuit, and be connected with signal debug circuit with signal processing circuit simultaneously from gain control circuit, the audio frequency processing circuit be connected with from gain control circuit, and form with the phase shift treatment circuit that audio frequency processing circuit is connected with from gain control circuit simultaneously, described phase shift treatment circuit is by phase shift chip U1, triode VT5, triode VT6, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R16 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R17, the polar capacitor C10 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R18, the polar capacitor C12 that negative pole is connected with the collector electrode of triode VT5, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C11 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R19 that the other end is connected with the collector electrode of triode VT6, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D3 that N pole is connected with the base stage of triode VT5, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT6 forms, the VCC+ pin of described phase shift chip U1 is connected with signal processing circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R19, the emitter of triode VT5 is connected with the base stage of triode VT6, as the output of system while the collector electrode of triode VT6 is connected with audio frequency processing circuit, the positive pole of polar capacitor C12 is connected with audio frequency processing circuit.
Described signal acquisition circuit comprises potentiometer R1, resistance R4, resistance R5, polar capacitor C1, polar capacitor C3, triode VT1; The collector electrode of triode VT1 is connected with signal debug circuit, its emitter is then connected with the sliding end of potentiometer R1 after polar capacitor C1 as signal input part, its base stage after potentiometer R1 through resistance R5, polar capacitor C3 and resistance R5 is in parallel, one end of resistance R4 is connected with signal debug circuit, the other end is then connected with the negative pole of polar capacitor C3, and the negative pole of described polar capacitor C3 is also connected with signal debug circuit and signal processing circuit simultaneously.
Described signal debug circuit is by triode VT2, the polar capacitor C2 that negative pole is connected with the base stage of triode VT2, positive pole is connected with resistance R4, the potentiometer R3 that one end is connected with the emitter of triode VT2, the other end is connected with the collector electrode of triode VT1, and the potentiometer R2 that one end is connected with the emitter of triode VT2, the other end is connected with the positive pole of polar capacitor C2 forms; The emitter of triode VT2 also with from gain control circuit is connected, its collector electrode is then connected with signal processing circuit with the negative pole of polar capacitor C3 simultaneously, and potentiometer R2 is all connected with the emitter of triode VT2 with the sliding end of potentiometer R3.
Described signal processing circuit is by triode VT4, the resistance R9 that one end is connected with the collector electrode of triode VT4, the other end is connected with from gain control circuit, the resistance R8 that one end is connected with the emitter of triode VT4, the other end is connected with the VCC+ pin of phase shift chip U1 after resistance R7, and the resistance R6 that one end is connected with the base stage of triode VT4, the other end is then connected with the collector electrode of triode VT2 forms, resistance R8 is connected with audio frequency processing circuit with from gain control circuit with the tie point of resistance R7 simultaneously.
Described from gain control circuit by operational amplifier P, triode VT3, diode D1, negative pole is connected with the normal phase input end of operational amplifier P, the polar capacitor C4 that positive pole is then connected with the emitter of triode VT2, negative pole is connected with the normal phase input end of operational amplifier P, the polar capacitor C5 that positive pole is connected with the emitter of triode VT3, one end is connected with the collector electrode of triode VT3, the resistance R10 of other end ground connection, positive pole is connected with the base stage of triode VT3, the polar capacitor C6 of minus earth, and one end is connected with the P pole of diode D1, the resistance R11 that the other end is connected with the VS+ pin of operational amplifier P forms, the inverting input of described operational amplifier P is connected with resistance R9, its VS-pin is connected with external power source, output is connected with the tie point of resistance R8 and resistance R7 and audio frequency processing circuit simultaneously, and the P pole of diode D1 is connected with external power source, its N pole is then connected with the emitter of triode VT3.
Described audio frequency processing circuit is by audio processing chip K, positive pole is connected with the GAIN2 pin of audio processing chip K after resistance R13, the polar capacitor C7 that negative pole is connected with the GAIN1 pin of audio processing chip K after polar capacitor C8, positive pole is connected with the OUT pin of audio processing chip K after resistance R14, the polar capacitor C9 that negative pole is then connected with the negative pole of polar capacitor C7, one end is connected with the BYP pin of audio processing chip K, the resistance R15 that the other end is connected with VS pin with the GAIN2 pin of audio processing chip K respectively, and one end is connected with the output of operational amplifier P, the resistance R12 that the other end is connected with the IN1 pin of audio processing chip K forms, the IN2 pin of described audio processing chip K is connected with the tie point of resistance R7 with resistance R8, GND pin ground connection, OUT pin is connected with the collector electrode of its VS pin and triode VT6 simultaneously, and the negative pole of polar capacitor C7 is also connected with the positive pole of polar capacitor C12.
Described phase shift chip U1 is LM741 integrated chip.
The present invention compared with prior art has the following advantages and beneficial effect:
1, the present invention adopts phase shift treatment circuit, and it can make audio frequency processing system audio frequency when the gain realizing relative broad range controls more stable.
2, it is highly sensitive to have employed LM741 integrated chip in phase shift treatment circuit of the present invention, cheap.
3, be provided with audio processing chip K in audio frequency processing circuit of the present invention, its can process small-signal while the noise of filtering out background, when avoiding small signal gain to amplify, background noise is also exaggerated, and affects audibility.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, of the present invention based on phase shift process from gain wide region audio frequency processing system, by signal acquisition circuit, the signal debug circuit be all connected with signal acquisition circuit and signal processing circuit, and be connected with signal debug circuit with signal processing circuit simultaneously from gain control circuit, the audio frequency processing circuit be connected with from gain control circuit, and form with the phase shift treatment circuit that audio frequency processing circuit is connected with from gain control circuit simultaneously.
Phase shift treatment circuit is emphasis of the present invention, it is by phase shift chip U1, triode VT5, triode VT6, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R16 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R17, the polar capacitor C10 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R18, the polar capacitor C12 that negative pole is connected with the collector electrode of triode VT5, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C11 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R19 that the other end is connected with the collector electrode of triode VT6, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D3 that N pole is connected with the base stage of triode VT5, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT6 forms, the VCC+ pin of described phase shift chip U1 is connected with signal processing circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R19, the emitter of triode VT5 is connected with the base stage of triode VT6, as the output of system while the collector electrode of triode VT6 is connected with audio frequency processing circuit, the positive pole of polar capacitor C12 is connected with audio frequency processing circuit.Phase shift treatment circuit, it can make audio frequency processing system audio frequency when the gain realizing relative broad range controls more stable.In order to ensure implementation result, described phase shift chip U1 elects LM741 integrated chip as, and it is highly sensitive, cheap.
Signal acquisition circuit in system is used for acquisition system external audio signal.It comprises potentiometer R1, resistance R4, resistance R5, polar capacitor C1, polar capacitor C3, triode VT1; The collector electrode of triode VT1 is connected with signal debug circuit, its emitter is then connected with the sliding end of potentiometer R1 after polar capacitor C1 as signal input part, its base stage after potentiometer R1 through resistance R5, polar capacitor C3 and resistance R5 is in parallel, one end of resistance R4 is connected with signal debug circuit, the other end is then connected with the negative pole of polar capacitor C3, and the negative pole of described polar capacitor C3 is also connected with signal debug circuit and signal processing circuit simultaneously.
In order to carry out preliminary debugging to the signal collected, be provided with signal debug circuit in system, it adopts the structure of Dual potentiometer to make debugging more accurate.This signal debug circuit is by triode VT2, the polar capacitor C2 that negative pole is connected with the base stage of triode VT2, positive pole is connected with resistance R4, the potentiometer R3 that one end is connected with the emitter of triode VT2, the other end is connected with the collector electrode of triode VT1, and the potentiometer R2 that one end is connected with the emitter of triode VT2, the other end is connected with the positive pole of polar capacitor C2 forms; The emitter of triode VT2 also with from gain control circuit is connected, its collector electrode is then connected with signal processing circuit with the negative pole of polar capacitor C3 simultaneously, and potentiometer R2 is all connected with the emitter of triode VT2 with the sliding end of potentiometer R3.
Described signal processing circuit is by triode VT4, the resistance R9 that one end is connected with the collector electrode of triode VT4, the other end is connected with from gain control circuit, the resistance R8 that one end is connected with the emitter of triode VT4, the other end is connected with the VCC+ pin of phase shift chip U1 after resistance R7, and the resistance R6 that one end is connected with the base stage of triode VT4, the other end is then connected with the collector electrode of triode VT2 forms, resistance R8 is connected with audio frequency processing circuit with from gain control circuit with the tie point of resistance R7 simultaneously.
Described from gain control circuit by operational amplifier P, triode VT3, diode D1, negative pole is connected with the normal phase input end of operational amplifier P, the polar capacitor C4 that positive pole is then connected with the emitter of triode VT2, negative pole is connected with the normal phase input end of operational amplifier P, the polar capacitor C5 that positive pole is connected with the emitter of triode VT3, one end is connected with the collector electrode of triode VT3, the resistance R10 of other end ground connection, positive pole is connected with the base stage of triode VT3, the polar capacitor C6 of minus earth, and one end is connected with the P pole of diode D1, the resistance R11 that the other end is connected with the VS+ pin of operational amplifier P forms, the inverting input of described operational amplifier P is connected with resistance R9, its VS-pin is connected with external power source, output is connected with the tie point of resistance R8 and resistance R7 and audio frequency processing circuit simultaneously, and the P pole of diode D1 is connected with external power source, its N pole is then connected with the emitter of triode VT3.After the process from gain control circuit, make inputted audio frequency signal amplitude consistent, thus avoid occurring when switching channels, broadcast advertisement the situation that volume differs.
In order to make the audiorange handled by audio frequency processing system wider, be therefore also provided with audio frequency processing circuit at the output from gain control circuit.This audio frequency processing circuit is by audio processing chip K, positive pole is connected with the GAIN2 pin of audio processing chip K after resistance R13, the polar capacitor C7 that negative pole is connected with the GAIN1 pin of audio processing chip K after polar capacitor C8, positive pole is connected with the OUT pin of audio processing chip K after resistance R14, the polar capacitor C9 that negative pole is then connected with the negative pole of polar capacitor C7, one end is connected with the BYP pin of audio processing chip K, the resistance R15 that the other end is connected with VS pin with the GAIN2 pin of audio processing chip K respectively, and one end is connected with the output of operational amplifier P, the resistance R12 that the other end is connected with the IN1 pin of audio processing chip K forms, the IN2 pin of described audio processing chip K is connected with the tie point of resistance R7 with resistance R8, GND pin ground connection, OUT pin is connected with the collector electrode of its VS pin and triode VT6 simultaneously, and the negative pole of polar capacitor C7 is also connected with the positive pole of polar capacitor C12.In order to better implement the present invention, described audio processing chip K is chosen as LM386 chip, and the noise of filtering out background while this chip can process small-signal, when avoiding small signal gain to amplify, background noise is also exaggerated, and affects audibility.
As mentioned above, just well the present invention can be realized.
Claims (7)
1. based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: by signal acquisition circuit, the signal debug circuit be all connected with signal acquisition circuit and signal processing circuit, and be connected with signal debug circuit with signal processing circuit simultaneously from gain control circuit, the audio frequency processing circuit be connected with from gain control circuit, and form with the phase shift treatment circuit that audio frequency processing circuit is connected with from gain control circuit simultaneously, described phase shift treatment circuit is by phase shift chip U1, triode VT5, triode VT6, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R16 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R17, the polar capacitor C10 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R18, the polar capacitor C12 that negative pole is connected with the collector electrode of triode VT5, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C11 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R19 that the other end is connected with the collector electrode of triode VT6, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D3 that N pole is connected with the base stage of triode VT5, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT6 forms, the VCC+ pin of described phase shift chip U1 is connected with signal processing circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R19, the emitter of triode VT5 is connected with the base stage of triode VT6, as the output of system while the collector electrode of triode VT6 is connected with audio frequency processing circuit, the positive pole of polar capacitor C12 is connected with audio frequency processing circuit.
2. according to claim 1 based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: described signal acquisition circuit comprises potentiometer R1, resistance R4, resistance R5, polar capacitor C1, polar capacitor C3, triode VT1; The collector electrode of triode VT1 is connected with signal debug circuit, its emitter is then connected with the sliding end of potentiometer R1 after polar capacitor C1 as signal input part, its base stage after potentiometer R1 through resistance R5, polar capacitor C3 and resistance R5 is in parallel, one end of resistance R4 is connected with signal debug circuit, the other end is then connected with the negative pole of polar capacitor C3, and the negative pole of described polar capacitor C3 is also connected with signal debug circuit and signal processing circuit simultaneously.
3. according to claim 2 based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: described signal debug circuit is by triode VT2, the polar capacitor C2 that negative pole is connected with the base stage of triode VT2, positive pole is connected with resistance R4, the potentiometer R3 that one end is connected with the emitter of triode VT2, the other end is connected with the collector electrode of triode VT1, and the potentiometer R2 that one end is connected with the emitter of triode VT2, the other end is connected with the positive pole of polar capacitor C2 forms; The emitter of triode VT2 also with from gain control circuit is connected, its collector electrode is then connected with signal processing circuit with the negative pole of polar capacitor C3 simultaneously, and potentiometer R2 is all connected with the emitter of triode VT2 with the sliding end of potentiometer R3.
4. according to claim 3 based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: described signal processing circuit is by triode VT4, one end is connected with the collector electrode of triode VT4, the resistance R9 that the other end is connected with from gain control circuit, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is connected with the VCC+ pin of phase shift chip U1 after resistance R7, and one end is connected with the base stage of triode VT4, the resistance R6 that the other end is then connected with the collector electrode of triode VT2 forms, resistance R8 is connected with audio frequency processing circuit with from gain control circuit with the tie point of resistance R7 simultaneously.
5. according to claim 4 based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: described from gain control circuit by operational amplifier P, triode VT3, diode D1, negative pole is connected with the normal phase input end of operational amplifier P, the polar capacitor C4 that positive pole is then connected with the emitter of triode VT2, negative pole is connected with the normal phase input end of operational amplifier P, the polar capacitor C5 that positive pole is connected with the emitter of triode VT3, one end is connected with the collector electrode of triode VT3, the resistance R10 of other end ground connection, positive pole is connected with the base stage of triode VT3, the polar capacitor C6 of minus earth, and one end is connected with the P pole of diode D1, the resistance R11 that the other end is connected with the VS+ pin of operational amplifier P forms, the inverting input of described operational amplifier P is connected with resistance R9, its VS-pin is connected with external power source, output is connected with the tie point of resistance R8 and resistance R7 and audio frequency processing circuit simultaneously, and the P pole of diode D1 is connected with external power source, its N pole is then connected with the emitter of triode VT3.
6. according to claim 5 based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: described audio frequency processing circuit is by audio processing chip K, positive pole is connected with the GAIN2 pin of audio processing chip K after resistance R13, the polar capacitor C7 that negative pole is connected with the GAIN1 pin of audio processing chip K after polar capacitor C8, positive pole is connected with the OUT pin of audio processing chip K after resistance R14, the polar capacitor C9 that negative pole is then connected with the negative pole of polar capacitor C7, one end is connected with the BYP pin of audio processing chip K, the resistance R15 that the other end is connected with VS pin with the GAIN2 pin of audio processing chip K respectively, and one end is connected with the output of operational amplifier P, the resistance R12 that the other end is connected with the IN1 pin of audio processing chip K forms, the IN2 pin of described audio processing chip K is connected with the tie point of resistance R7 with resistance R8, GND pin ground connection, OUT pin is connected with the collector electrode of its VS pin and triode VT6 simultaneously, and the negative pole of polar capacitor C7 is also connected with the positive pole of polar capacitor C12.
7. according to any one of claim 1 ~ 6 based on phase shift process from gain wide region audio frequency processing system, it is characterized in that: described phase shift chip U1 is LM741 integrated chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691209.7A CN104410941A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based automatic-gain wide-range audio processing system |
| CN201510307225.6A CN104868848A (en) | 2014-11-26 | 2015-06-06 | Self-gain audio processing system based on capacitive feedback three-point oscillating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691209.7A CN104410941A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based automatic-gain wide-range audio processing system |
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| CN104410941A true CN104410941A (en) | 2015-03-11 |
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| CN201410691209.7A Pending CN104410941A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based automatic-gain wide-range audio processing system |
| CN201510307225.6A Withdrawn CN104868848A (en) | 2014-11-26 | 2015-06-06 | Self-gain audio processing system based on capacitive feedback three-point oscillating circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510307225.6A Withdrawn CN104868848A (en) | 2014-11-26 | 2015-06-06 | Self-gain audio processing system based on capacitive feedback three-point oscillating circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868848A (en) * | 2014-11-26 | 2015-08-26 | 成都冠深科技有限公司 | Self-gain audio processing system based on capacitive feedback three-point oscillating circuit |
| CN113746994A (en) * | 2021-11-05 | 2021-12-03 | 天津七一二移动通信有限公司 | Method for realizing anti-howling automatic gain adjustment hand microphone circuit for rail transit |
| CN116455340A (en) * | 2023-06-16 | 2023-07-18 | 广州市声讯电子科技股份有限公司 | Loudspeaker audio gain control system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5600283A (en) * | 1995-09-13 | 1997-02-04 | National Semiconductor Corporation | DC isolated differential oscillator having floating capacitor |
| CN204316738U (en) * | 2014-11-26 | 2015-05-06 | 成都创图科技有限公司 | Based on phase shift process from gain wide region audio frequency processing system |
| CN104410941A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase-shift processing based automatic-gain wide-range audio processing system |
-
2014
- 2014-11-26 CN CN201410691209.7A patent/CN104410941A/en active Pending
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2015
- 2015-06-06 CN CN201510307225.6A patent/CN104868848A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868848A (en) * | 2014-11-26 | 2015-08-26 | 成都冠深科技有限公司 | Self-gain audio processing system based on capacitive feedback three-point oscillating circuit |
| CN113746994A (en) * | 2021-11-05 | 2021-12-03 | 天津七一二移动通信有限公司 | Method for realizing anti-howling automatic gain adjustment hand microphone circuit for rail transit |
| CN113746994B (en) * | 2021-11-05 | 2022-04-08 | 天津七一二移动通信有限公司 | Method for realizing anti-howling automatic gain adjustment hand microphone circuit for rail transit |
| CN116455340A (en) * | 2023-06-16 | 2023-07-18 | 广州市声讯电子科技股份有限公司 | Loudspeaker audio gain control system and method |
| CN116455340B (en) * | 2023-06-16 | 2023-08-18 | 广州市声讯电子科技股份有限公司 | Loudspeaker audio gain control system and method |
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| CN104868848A (en) | 2015-08-26 |
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Application publication date: 20150311 |