CN103762952A - Differential simulation voice conversion circuit - Google Patents
Differential simulation voice conversion circuit Download PDFInfo
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- CN103762952A CN103762952A CN201410011706.8A CN201410011706A CN103762952A CN 103762952 A CN103762952 A CN 103762952A CN 201410011706 A CN201410011706 A CN 201410011706A CN 103762952 A CN103762952 A CN 103762952A
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Abstract
The invention provides a differential simulation voice conversion circuit which comprises a signal input end AIN, a first differential signal output end out-, a second differential signal output end out+, a triode Q1, resistors R1, R2, R4 and R6, and capacitors C6, C7, C8 and C9. The signal input end AIN is connected with the base of the triode Q1 through the capacitor C7. The collector of the triode Q1 is connected with an external power supply V8 through the resistor R1 and connected with the first differential signal output end out- through the capacitor C8. The emitter of the triode Q1 is grounded through the resistor R2 and connected to the second differential signal output end out+ through the capacitor C9. The resistor R4 and the resistor R6 are serially connected between the external power supply V8 and a ground wire. The resistor R4 and R6 are used for performing voltage differentiation on the external power supply V8, and accordingly the static working point of the triode Q1 can be set, and the triode Q1 is allowed to work in the amplification state. The differential simulation voice conversion circuit is simple in circuit and low in cost.
Description
Technical field
The invention belongs to electronic circuit field, a kind of especially difference analogue speech conversion circuit.
Background technology
In current audio decoder chip, normally by an output pin, carry out output audio signal, then by difference analogue speech conversion circuit Lai Jiang mono-road signal, be converted to a road differential signal.In prior art, be generally by two amplifiers or with special power amplifier, carry out Jiang Ci mono-tunnel audio signal and change, thereby convert differential signal to because Difference signal pair anti-interference is helpful.
But, adopt two operational amplifiers can cause circuit complexity, cost is high, accounts for pcb board area large, and the consistency of operational amplifier will get well, and the quality of chip be there are certain requirements.Adopt special power amplifier can cause circuit complexity, cost is higher, and it is large to account for pcb board area.
Therefore, how to solve difference analogue speech conversion circuit complexity of the prior art and the high problem of cost, become the technical problem that current urgent need solves.
Summary of the invention
The object of the invention is to propose a kind of difference analogue speech conversion circuit, its circuit is simple and cost is low.
A kind of difference analogue speech conversion circuit, it comprises signal input part AIN, the first differential signal output out-, the second differential signal output out+, triode Q1, resistance R 1, R2, R4, R6, capacitor C 6, C7, C8, C9, signal input part AIN is connected with the base stage of triode Q1 by capacitor C 7, the collector electrode of triode Q1 is connected with external power source V8 by resistance R 1 respectively and is connected to the first differential signal output out-by capacitor C 8, the emitter of triode Q1 is connected to the second differential signal output out+ by resistance R 2 ground connection with by capacitor C 9 respectively, resistance R 4, R6 is series between external power source V8 and ground wire, capacitor C 6 is connected between ground wire and resistance R 1 and the connecting line of resistance R 6, resistance R 4, connecting line between R6 is connected with the base stage of triode Q1, resistance R 4, R6 is for carrying out dividing potential drop to external power source V8, thereby the quiescent point of triode Q1 is set, make it be operated in magnifying state.
Wherein, the resistance of resistance R 1, R2 equates.
Wherein, described difference analogue speech conversion circuit further comprises resistance R 3, R5, and resistance R 5 is connected between signal input part AIN and capacitor C 7, and resistance R 3 is connected between the connecting line between ground wire and capacitor C 7 and resistance R 5.
Wherein, in capacitor C 8, C9 and the first differential signal output out-, between the second differential signal output out+, further comprise that one by capacitor C 1, C2, C3, C4, inductance L 1, L2 composition air interference filter network, capacitor C 1 respectively with capacitor C 8, C9 is connected, inductance L 1 is connected between capacitor C 8 and the first differential signal output out-, inductance L 2 is connected between capacitor C 9 and the second differential signal output out+, capacitor C 2 is connected between the first differential signal output out-and ground wire, capacitor C 3 is connected between the second differential signal output out+ and ground wire, capacitor C 4 is connected between the first differential signal output out-and the second differential signal output out+.
Wherein, described difference analogue speech conversion circuit further comprises resistance R 7, resistance R 7 respectively with external power source V8 and resistance R 1, R6 between connecting line be connected, and the resistance of resistance R 7 is much smaller than resistance R 1.
Wherein, described difference analogue speech conversion circuit further comprises capacitor C 5, and capacitor C 5 is in parallel with capacitor C 6.
Compared with prior art, only by a cheapness, common transistor is core to difference analogue speech conversion circuit of the present invention, mates some cheap resistance capacitances can complete, and with low cost, reliability is high, and availability is high, and it is less to account for pcb board area.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the difference analogue speech conversion circuit of one embodiment of the invention.
Embodiment
As shown in Figure 1, the difference analogue speech conversion circuit of one embodiment of the invention comprises signal input part AIN, the first differential signal output out-, the second differential signal output out+, triode Q1, capacitor C 1, C2, C3, C4, C5, C6, C7, C8, C9, resistance R 1, R2, R3, R4, R5, R6, R7.Signal input part AIN is connected with the base stage of triode Q1 by resistance R 5, capacitor C 7, and resistance R 3 is connected between the connecting line between ground wire and capacitor C 7 and resistance R 5.
The collector electrode of triode Q1 is connected with external power source V8 by resistance R 1, R7 respectively and is connected to the first differential signal output out-by capacitor C 8, inductance L 1, and the emitter of triode Q1 is connected to the second differential signal output out+ by resistance R 2 ground connection with by capacitor C 9, inductance L 2 respectively.Resistance R 4, R6 are series between resistance R 7 and ground wire, capacitor C 6 is connected between ground wire and resistance R 1 and the connecting line of resistance R 6, capacitor C 5 is in parallel with capacitor C 6, connecting line between resistance R 4, R6 is connected with the base stage of triode Q1, resistance R 4, R6 are for carrying out dividing potential drop to external power source V8, thereby the quiescent point of triode Q1 is set, makes it be operated in magnifying state.Wherein, resistance R 7, capacitor C 5, capacitor C 6 form RC filter circuit.The resistance of resistance R 7 is much smaller than resistance R 1, and capacitor C 5 is little electric capacity, and high-frequency signal is carried out to filtering, and capacitor C 6 is large electric capacity, and low frequency signal is carried out to filtering.
Capacitor C 1, C2, C3, C4, inductance L 1, L2 composition air interference filter network, carry out filtering to the audio signal of output, prevents that external wireless signals from causing interference to audio signal.Capacitor C 1 is connected with capacitor C 8, C9 respectively, inductance L 1 is connected between capacitor C 8 and the first differential signal output out-, inductance L 2 is connected between capacitor C 9 and the second differential signal output out+, capacitor C 2 is connected between the first differential signal output out-and ground wire, capacitor C 3 is connected between the second differential signal output out+ and ground wire, and capacitor C 4 is connected between the first differential signal output out-and the second differential signal output out+.
Input signal source is inputted by signal input part AIN, by R5, R3, carrys out control signal attenuation ratio, and is coupled into triode Q1 by capacitor C 7.C8, C9 be for isolated DC voltage, by ac voltage signal coupling output, by the first differential signal output out-, the second differential signal output out+ with output difference multi-voice frequency signal.
In the above-described embodiments, triode Q1 is operated in magnifying state, and its operating voltage can arrange by R4, R6.
When Q1 amplifies in exchanging, electric current flows to emitter (E) from collector electrode (C), thereby because flow through resistance R 1, R2 of identical electric current I realizes simultaneously, specific as follows:
Emitter (E) voltage: Ve=I * R2; Transistor amplifier Ve=Vb, wherein, Vb is base stage (B) voltage;
Collector electrode (C) voltage: Vc=V8-I*R1, owing to being AC signal, V8=GND, therefore Vc=-I*R1;
Because R1=R2, and R7 is much smaller than R1, thus Vb=Ve=-Vc, thus realized the function of single-ended signal slip sub-signal.
Compared with prior art, only by a cheapness, common transistor is core to difference analogue speech conversion circuit of the present invention, mates some cheap resistance capacitances can complete, and with low cost, reliability is high, and availability is high, and it is less to account for pcb board area.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a difference analogue speech conversion circuit, it is characterized in that, comprise signal input part AIN, the first differential signal output out-, the second differential signal output out+, triode Q1, resistance R 1, R2, R4, R6, capacitor C 6, C7, C8, C9, signal input part AIN is connected with the base stage of triode Q1 by capacitor C 7, the collector electrode of triode Q1 is connected with external power source V8 by resistance R 1 respectively and is connected to the first differential signal output out-by capacitor C 8, the emitter of triode Q1 is connected to the second differential signal output out+ by resistance R 2 ground connection with by capacitor C 9 respectively, resistance R 4, R6 is series between external power source V8 and ground wire, capacitor C 6 is connected between ground wire and resistance R 1 and the connecting line of resistance R 6, resistance R 4, connecting line between R6 is connected with the base stage of triode Q1, resistance R 4, R6 is for carrying out dividing potential drop to external power source V8, thereby the quiescent point of triode Q1 is set, make it be operated in magnifying state.
2. difference analogue speech conversion circuit according to claim 1, is characterized in that, the resistance of resistance R 1, R2 equates.
3. difference analogue speech conversion circuit according to claim 1, it is characterized in that, further comprise resistance R 3, R5, resistance R 5 is connected between signal input part AIN and capacitor C 7, and resistance R 3 is connected between the connecting line between ground wire and capacitor C 7 and resistance R 5.
4. difference analogue speech conversion circuit according to claim 1, it is characterized in that, in capacitor C 8, C9 and the first differential signal output out-, between the second differential signal output out+, further comprise that one by capacitor C 1, C2, C3, C4, inductance L 1, L2 composition air interference filter network, capacitor C 1 respectively with capacitor C 8, C9 is connected, inductance L 1 is connected between capacitor C 8 and the first differential signal output out-, inductance L 2 is connected between capacitor C 9 and the second differential signal output out+, capacitor C 2 is connected between the first differential signal output out-and ground wire, capacitor C 3 is connected between the second differential signal output out+ and ground wire, capacitor C 4 is connected between the first differential signal output out-and the second differential signal output out+.
5. difference analogue speech conversion circuit according to claim 1, is characterized in that, further comprises resistance R 7, resistance R 7 respectively with external power source V8 and resistance R 1, R6 between connecting line be connected, and the resistance of resistance R 7 is much smaller than resistance R 1.
6. difference analogue speech conversion circuit according to claim 1, is characterized in that, further comprise capacitor C 5, capacitor C 5 is in parallel with capacitor C 6.
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| CN201410011706.8A CN103762952A (en) | 2014-01-10 | 2014-01-10 | Differential simulation voice conversion circuit |
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| CN201410011706.8A CN103762952A (en) | 2014-01-10 | 2014-01-10 | Differential simulation voice conversion circuit |
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Citations (10)
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| WO1998019457A1 (en) * | 1996-10-31 | 1998-05-07 | Isthmus Technology Group, L.P. | Transmitter and receiver circuits for transmission of voice, data and video signals for extended distances |
| WO2004028218A1 (en) * | 2002-09-12 | 2004-04-01 | Tridonicatco Gmbh & Co. Kg | Electronic ballast with a charge pump for active power factor correction |
| CN2708563Y (en) * | 2004-06-17 | 2005-07-06 | 四川湖山电子股份有限公司 | Class H audio power amplifier |
| CN1764066A (en) * | 2005-09-21 | 2006-04-26 | 东南大学 | Electromagnetic interference eliminator for power system automation apparatus |
| CN1933273A (en) * | 2005-09-12 | 2007-03-21 | 上海浩顺科技有限公司 | Power supply wave shape correcting filter |
| CN201965907U (en) * | 2010-12-29 | 2011-09-07 | 上海博泰悦臻电子设备制造有限公司 | Microphone device |
| CN102543093A (en) * | 2010-12-29 | 2012-07-04 | 上海博泰悦臻电子设备制造有限公司 | Microphone device |
| CN102572644A (en) * | 2010-12-29 | 2012-07-11 | 上海博泰悦臻电子设备制造有限公司 | Microphone device |
| CN102570462A (en) * | 2010-12-20 | 2012-07-11 | 西安开容电子技术有限责任公司 | Input and output high isolation filter and design method thereof |
| CN102929120A (en) * | 2012-11-08 | 2013-02-13 | 深圳市天星泰光电科技有限公司 | Multifunctional clock |
-
2014
- 2014-01-10 CN CN201410011706.8A patent/CN103762952A/en active Pending
Patent Citations (10)
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|---|---|---|---|---|
| WO1998019457A1 (en) * | 1996-10-31 | 1998-05-07 | Isthmus Technology Group, L.P. | Transmitter and receiver circuits for transmission of voice, data and video signals for extended distances |
| WO2004028218A1 (en) * | 2002-09-12 | 2004-04-01 | Tridonicatco Gmbh & Co. Kg | Electronic ballast with a charge pump for active power factor correction |
| CN2708563Y (en) * | 2004-06-17 | 2005-07-06 | 四川湖山电子股份有限公司 | Class H audio power amplifier |
| CN1933273A (en) * | 2005-09-12 | 2007-03-21 | 上海浩顺科技有限公司 | Power supply wave shape correcting filter |
| CN1764066A (en) * | 2005-09-21 | 2006-04-26 | 东南大学 | Electromagnetic interference eliminator for power system automation apparatus |
| CN102570462A (en) * | 2010-12-20 | 2012-07-11 | 西安开容电子技术有限责任公司 | Input and output high isolation filter and design method thereof |
| CN201965907U (en) * | 2010-12-29 | 2011-09-07 | 上海博泰悦臻电子设备制造有限公司 | Microphone device |
| CN102543093A (en) * | 2010-12-29 | 2012-07-04 | 上海博泰悦臻电子设备制造有限公司 | Microphone device |
| CN102572644A (en) * | 2010-12-29 | 2012-07-11 | 上海博泰悦臻电子设备制造有限公司 | Microphone device |
| CN102929120A (en) * | 2012-11-08 | 2013-02-13 | 深圳市天星泰光电科技有限公司 | Multifunctional clock |
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Application publication date: 20140430 |