CN104393849A - Voice frequency processing system based on adaptive gain control - Google Patents
Voice frequency processing system based on adaptive gain control Download PDFInfo
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- CN104393849A CN104393849A CN201410660799.7A CN201410660799A CN104393849A CN 104393849 A CN104393849 A CN 104393849A CN 201410660799 A CN201410660799 A CN 201410660799A CN 104393849 A CN104393849 A CN 104393849A
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Abstract
The invention discloses a voice frequency processing system based on adaptive gain control. The voice frequency processing system based on adaptive gain control is characterized by consisting of a signal acquiring circuit, a signal debugging circuit and a signal processing circuit which are connected to the signal acquiring circuit, and an adaptive gain control circuit which is simultaneously connected to the signal processing circuit and the signal debugging circuit; the adaptive gain control circuit consists of an operational amplifier P, a triode VT3, a diode D1, a capacitor C4, a capacitor C5, a resistor R10, a capacitor C6 and a resistor R11, wherein the negative electrode of the capacitor C4 is connected with the positive phase input end of the operational amplifier P, the positive electrode of the capacitor C4 is connected with the signal debugging circuit; the negative electrode of the capacitor C5 is connected with the positive phase input end of the operational amplifier P, the positive electrode of the capacitor C5 is connected with an emitter electrode of the triode VT3; one end of the resistor R10 is connected with a collector electrode of the triode VT3, and the other end of the resistor R10 is grounded; the positive electrode of the capacitor C6 is connected with a base electrode of the triode VT3, and the negative electrode of the capacitor C6 is grounded; and one end of the resistor R11 is connected with an electrode P of the diode D1, and the other end of the resistor R11 is connected with a VS<+> tube pin of the operational amplifier P. By virtue of the control of the adaptive gain control circuit, the voice frequency processing system based on the adaptive gain control can be used for enabling the amplitude of the voice frequency signal input to be consistent, so that the condition that the volume sizes are different while the channels are switched and advertisement is played is avoided.
Description
Technical field
The present invention relates to a kind of audio frequency processing system, specifically referring to a kind of audio frequency processing system based on controlling from gain.
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., its internal audio frequency treatment system cannot carry out gain control, there will be the situation that volume differs when signal is exported, have a strong impact on the audibility of user.
Summary of the invention
The object of the invention is to solve current audio frequency processing system and cannot carry out the defect of gain control, provide a kind of can realize that gain controls based on the audio frequency processing system controlled from gain.
Object of the present invention is by following technical proposals reality: based on the audio frequency processing system controlled from gain, by signal acquisition circuit, the signal debug circuit be all connected with signal acquisition circuit and signal processing circuit, and forming from gain control circuit of being simultaneously connected with signal debug circuit with signal processing circuit.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 electric capacity C4 that positive pole is then connected with signal debug circuit, negative pole is connected with the normal phase input end of operational amplifier P, the electric capacity 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 electric capacity 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 end of oppisite phase of described operational amplifier P is connected with signal processing circuit, its VS-pin is connected with external power source, 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.
Further, described signal acquisition circuit comprises potentiometer R1, resistance R4, resistance R5, electric capacity C1, electric capacity 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 electric capacity C1 as signal input part, its base stage after potentiometer R1 through resistance R5, electric capacity 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 electric capacity C3, and the negative pole of described electric capacity C3 is also connected with signal debug circuit and signal processing circuit simultaneously.
Described signal debug circuit is by triode VT2, the electric capacity 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 electric capacity C2 forms; The emitter of triode VT2 is connected with the positive pole of electric capacity C4, its collector electrode is then connected with signal processing circuit with the negative pole of electric capacity 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 the inverting input of operational amplifier P, the resistance R8 that one end is connected with the emitter of triode VT4, the other end is connected with the output of operational amplifier P, one end is connected with the output of operational amplifier P, the resistance R7 of other end ground connection, 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.
The present invention compared with prior art has the following advantages and beneficial effect:
1, the present invention is compared with prior art provided with from gain control circuit, consistent by the amplitude making audio signal input from the control of gain control circuit, thus the situation that when avoiding occurring switching channels, broadcast advertisement, volume differs
2, structure of the present invention is simple, and cost of manufacture is low.
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, audio frequency processing system based on controlling from gain of the present invention, by signal acquisition circuit, the signal debug circuit be all connected with signal acquisition circuit and signal processing circuit, and forming from gain control circuit of being simultaneously connected with signal debug circuit with signal processing circuit.
Be wherein emphasis of the present invention from gain control circuit, it is by operational amplifier P, triode VT3, diode D1, resistance R10, resistance R11, electric capacity C4, electric capacity C5, and electric capacity C6 forms.During connection, the negative pole of electric capacity C4 is connected with the normal phase input end of operational amplifier P, positive pole is then connected with signal debug circuit, the negative pole of electric capacity C5 is connected with the normal phase input end of operational amplifier P, positive pole is connected with the emitter of triode VT3, one end of resistance R10 is connected with the collector electrode of triode VT3, other end ground connection, the positive pole of electric capacity C6 is connected with the base stage of triode VT3, minus earth, and one end of resistance R11 is connected with the P pole of diode D1, the other end is connected with the VS+ pin of operational amplifier P.Simultaneously, the P pole of diode D1 is connected with external power source, its N pole is then connected with the emitter of triode VT3, the end of oppisite phase of operational amplifier P is connected with signal processing circuit, its VS-pin is connected with external power source, and output is as system signal output.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.Operational amplifier P and electric capacity C4 together form wave detector, and therefore, operational amplifier plays the function of amplifier and wave detector simultaneously, makes system not only simple but also cheap.
Signal acquisition circuit in system is used for acquisition system external audio signal, and it comprises potentiometer R1, resistance R4, resistance R5, electric capacity C1, electric capacity C3, triode VT1.During connection, 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 electric capacity C1 as signal input part, its base stage after potentiometer R1 through resistance R5, electric capacity 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 electric capacity C3, and the negative pole of described electric capacity 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 really cold.Its concrete structure is by triode VT2, the electric capacity 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 electric capacity C2 forms; The emitter of triode VT2 is connected with the positive pole of electric capacity C4, its collector electrode is then connected with signal processing circuit with the negative pole of electric capacity C3 simultaneously, and potentiometer R2 is all connected with the emitter of triode VT2 with the sliding end of potentiometer R3.
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 the inverting input of operational amplifier P, the resistance R8 that one end is connected with the emitter of triode VT4, the other end is connected with the output of operational amplifier P, one end is connected with the output of operational amplifier P, the resistance R7 of other end ground connection, 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.
As mentioned above, just well the present invention can be realized.
Claims (4)
1. based on the audio frequency processing system controlled from gain, 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 forming from gain control circuit of being simultaneously connected with signal debug circuit with signal processing circuit, 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 electric capacity C4 that positive pole is then connected with signal debug circuit, negative pole is connected with the normal phase input end of operational amplifier P, the electric capacity 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 electric capacity 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 end of oppisite phase of described operational amplifier P is connected with signal processing circuit, its VS-pin is connected with external power source, 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.
2. the audio frequency processing system based on controlling from gain according to claim 1, is characterized in that: described signal acquisition circuit comprises potentiometer R1, resistance R4, resistance R5, electric capacity C1, electric capacity 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 electric capacity C1 as signal input part, its base stage after potentiometer R1 through resistance R5, electric capacity 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 electric capacity C3, and the negative pole of described electric capacity C3 is also connected with signal debug circuit and signal processing circuit simultaneously.
3. the audio frequency processing system based on controlling from gain according to claim 2, it is characterized in that: described signal debug circuit is by triode VT2, the electric capacity 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 electric capacity C2 forms; The emitter of triode VT2 is connected with the positive pole of electric capacity C4, its collector electrode is then connected with signal processing circuit with the negative pole of electric capacity C3 simultaneously, and potentiometer R2 is all connected with the emitter of triode VT2 with the sliding end of potentiometer R3.
4. the audio frequency processing system based on controlling from gain according to claim 3, 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 the inverting input of operational amplifier P, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is connected with the output of operational amplifier P, one end is connected with the output of operational amplifier P, the resistance R7 of other end ground connection, 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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410660799.7A CN104393849A (en) | 2014-11-18 | 2014-11-18 | Voice frequency processing system based on adaptive gain control |
| CN201510310400.7A CN104967417A (en) | 2014-11-18 | 2015-06-08 | Automatic gain control-based voltage stabilization oscillation type audio processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410660799.7A CN104393849A (en) | 2014-11-18 | 2014-11-18 | Voice frequency processing system based on adaptive gain control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104393849A true CN104393849A (en) | 2015-03-04 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410660799.7A Pending CN104393849A (en) | 2014-11-18 | 2014-11-18 | Voice frequency processing system based on adaptive gain control |
| CN201510310400.7A Withdrawn CN104967417A (en) | 2014-11-18 | 2015-06-08 | Automatic gain control-based voltage stabilization oscillation type audio processing system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510310400.7A Withdrawn CN104967417A (en) | 2014-11-18 | 2015-06-08 | Automatic gain control-based voltage stabilization oscillation type audio processing system |
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| CN (2) | CN104393849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211738A (en) * | 2020-01-13 | 2020-05-29 | 芜湖宏景电子股份有限公司 | Level amplifying circuit |
-
2014
- 2014-11-18 CN CN201410660799.7A patent/CN104393849A/en active Pending
-
2015
- 2015-06-08 CN CN201510310400.7A patent/CN104967417A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211738A (en) * | 2020-01-13 | 2020-05-29 | 芜湖宏景电子股份有限公司 | Level amplifying circuit |
| CN111211738B (en) * | 2020-01-13 | 2023-08-22 | 芜湖宏景电子股份有限公司 | Level amplifying circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104967417A (en) | 2015-10-07 |
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Application publication date: 20150304 |