CN201185409Y - Multipath double track audio commutation circuit - Google Patents
Multipath double track audio commutation circuit Download PDFInfo
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- CN201185409Y CN201185409Y CNU2008200934514U CN200820093451U CN201185409Y CN 201185409 Y CN201185409 Y CN 201185409Y CN U2008200934514 U CNU2008200934514 U CN U2008200934514U CN 200820093451 U CN200820093451 U CN 200820093451U CN 201185409 Y CN201185409 Y CN 201185409Y
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Abstract
The utility model provides a multi-signal line dual-channel audio switching circuit, which consists of a plurality of switching control circuits, a left channel switch transistor, a right channel switch transistor and a controller, wherein, the switching control circuits are respectively connected between each audio signal input terminal and audio signal output terminal, the switching control circuits consist of a left channel emitter follower and a right channel emitter follower, base electrodes of the switching control circuits are respectively coupled with a left channel input signal and a right channel input signal of the audio input signal via a capacitor, a collector electrodes of the switching control circuits are connected with an external power source, and an emitter of the switching control circuits is connected with the audio signal output terminals; collector electrodes of the left channel switch transistor and the right channel switch transistor are respectively connected with base electrodes of a left channel emitter follower or a right channel emitter follower; the controller is used to send out control signals to enable either of the audio signal, and is provided with a plurality of control terminals to send out control signals, wherein, each control terminal is connected respectively with the base electrodes of the left channel switch transistor and the base electrodes of the right channel switch transistor of one of the switching control circuits. The utility model has high extensibility and practicality.
Description
Technical field
The utility model relates to electronic switching circuit, especially relates to a kind of commutation circuit of multichannel binaural audio signal.
Background technology
Along with television technologies, the maturation of cathode ray tube (CRT) TV tech particularly, the competition of television set industry is except depending on the increase of new function, outside the high performance lifting, more consideration also has product cost, nowadays a large amount of multiple-channel electronic switches chips that adopt are except expensive, and it is unnecessary that the passage that provides also has, and very easily form waste.
The employed electronic switch that is used for switch audio costs an arm and a leg in the television set design process, and the way of switch audio input signal fixes and can not adjust according to actual needs, therefore has the material drawback of waste easily; In addition, existing electronic switch is to use transistor to be equipped with resistance and electric capacity and waits and realize, has the unfavorable factor that reduces the audio frequency power consumption.
The utility model content
Purpose of the present invention is exactly to switch electronic switch and have that to cost an arm and a leg, switch way improper and audio signal had drawback than lossy in order to overcome audio frequency used in the existing television set design process, a kind of multichannel dual-channel audio commutation circuit is proposed, realize the purpose that the multichannel dual-channel audio switches with low cost, but and the way that at random increases and decreases switch audio as required of maneuverability, avoided waste.
For addressing the above problem, the utility model discloses a kind of multichannel dual-channel audio commutation circuit, comprising:
A plurality of every road audio signal input end of dual track and control switching circuits between the audio signal output end of being connected to, this control switching circuit comprises:
L channel emitter follower and R channel emitter follower, its base stage couple the L channel input signal and the R channel input signal of this road audio input signal respectively by electric capacity, its collector electrode connects external power supply, and emitter connects audio signal output end;
L channel switching transistor and R channel switching transistor, its collector electrode connects the base stage of L channel emitter follower or R channel emitter follower respectively, and connects external power supply by resistance respectively, and its grounded emitter;
Be used to send the control signal gating wherein one road audio signal output to the controller of audio signal output end, it has a plurality of control ends that send control signal, and each control end connects the base stage of the L channel switching transistor in one of them control switching circuit and the base stage of R channel switching transistor respectively.
More excellent, described control switching circuit also comprises: be connected between the emitter of the base stage of L channel emitter follower and L channel switching transistor, L channel shunt capacitance and R channel shunt capacitance between the emitter of the base stage of R channel emitter follower and R channel switching transistor.
More excellent, described control switching circuit also comprises: be connected between L channel input signal and the L channel coupling capacitance, L channel divider resistance and R channel divider resistance between R channel input signal and the R channel coupling capacitance.
More excellent, described L channel divider resistance and described R channel divider resistance include: first resistance that is connected in series with L channel coupling capacitance or R channel coupling capacitance respectively; The one terminal common port that connects first resistance and L channel coupling capacitance or R channel coupling capacitance, second resistance of another terminal ground connection.
More excellent, described L channel emitter follower, described R channel emitter follower, described L channel switching transistor and described R channel switching transistor are NPN transistor.
Compared with prior art, the utlity model has following beneficial effect:
The utility model has been realized the purpose that the multichannel dual-channel audio switches with low cost, but and the way that at random increases and decreases switch audio as required of maneuverability, expandability is strong, and has avoided waste, has very strong practicality.
Description of drawings
Fig. 1 is the circuit diagram of the utility model first embodiment;
Fig. 2 is the circuit diagram of the utility model second embodiment;
Fig. 3 is the circuit diagram of the utility model the 3rd embodiment.
Embodiment
With reference to shown in Figure 1, present embodiment is the circuit diagram of two-way dual-channel audio commutation circuit.First via binaural audio signal comprises L channel input signal 1 and R channel input signal 1; The second road binaural audio signal comprises L channel input signal 2 and R channel input signal 2.And L channel input signal 1 or L channel input signal 2 export power amplifier to from the left channel audio signal output; And R channel input signal 1 or R channel input signal 2 export power amplifier to from the right channel audio signal output.
The commutation circuit of present embodiment comprises: two control switching circuits that are connected between first, second road binaural audio signal input and the audio signal output end; And be used to send the control signal gating wherein one road audio signal output to the controller of audio signal output end.
Each control switching circuit has identical circuit structure.With the control switching circuit that is connected with first via binaural audio signal is example, elaborates the structure of this control switching circuit.This control switching circuit comprises the two parts that are used for difference switching right and left channel audio.
Wherein, the control switching circuit of L channel partly comprises: L channel input signal 1 is by the first divider resistance R1, be coupled to the base stage of L channel emitter follower Q1 through capacitor C 1, and the collector electrode of L channel emitter follower Q1 meets external power supply+V (being generally 5 to 8 volts), and emitter connects the left channel audio signal output; And the base stage of L channel emitter follower Q1 connects the collector electrode of L channel switching transistor Q5, the collector electrode of this L channel switching transistor Q5 meets external power supply+V by resistance R 2, grounded emitter, base stage is connected with the control signal switch1 that controller first control end sends.
The control switching circuit of R channel partly comprises: R channel input signal 1 is by the first divider resistance R10, be coupled to the base stage of R channel emitter follower Q4 through capacitor C 4, and the collector electrode of R channel emitter follower Q4 meets external power supply+V, and emitter connects the right channel audio signal output; And the base stage of R channel emitter follower Q4 connects the collector electrode of R channel switching transistor Q8, the collector electrode of this R channel switching transistor Q8 meets external power supply+V by resistance R 12, grounded emitter, base stage is connected with the control signal switch1 that controller first control end sends.
As can be seen from Figure 1, the control signal switch2 that sends of second control end of controller is connected to respectively and is used for controlling the base stage of the control switching circuit L channel switching transistor Q6 that switches the second road binaural audio signal and the base stage of R channel switching transistor Q7.
In addition, by regulating the size of divider resistance,, can adjust the signal amplitude of input audio signal such as the resistance of adjusting resistance R 1 and R3; Shunt capacitance C5, C6, C7 and C8 then are respectively applied for the interference signal of each path sound intermediate frequency signal of filtering.
Therefore, when control signal switch1 that controller sends is 0 (analog level is about 0V), when control signal switch2 is 1 (analog level is about 3.3V), Q5 and Q8 are in cut-off state, the L channel input signal and the R channel input signal of first via binaural audio signal enter Q1 and Q4 respectively, almost the emitter from Q1 and Q4 of constant amplitude is exported, and exports power amplifier to from audio signal output end.And the complete saturation conduction of Q6, Q7, its collector electrode short circuit ground connection, Q2 and Q3 input are 0V, thus the second road binaural audio signal can't arrive audio signal output end.In like manner, the control signal switch1 that sends when controller is 1, and switch2 is 0 o'clock, only select to make the second road binaural audio signal to arrive audio signal output end, and first via binaural audio signal can't arrive audio signal output end.
Maximum characteristics of the present utility model are, can be according to actual needs, and by increasing or deleting that control switching circuit realizes control is selected in the switching of multichannel binaural audio signal.
As shown in Figure 2, when having three road binaural audio signals, only need increase a control switching circuit between the L channel input signal 3 of Third Road binaural audio signal and R channel input signal 3 and audio signal output end, the control signal switch3 that utilizes the 3rd control end of controller to send controls:
When control signal switch1=0, control signal switch2=1, control signal switch3=1, select output L channel input signal 1 and R channel input signal 1; When control signal switch1=1, control signal switch2=0, control signal switch3=1, select output L channel input signal 2 and R channel input signal 2; When control signal switch1=1, control signal switch2=1, control signal switch3=0, select output L channel input signal 3 and R channel input signal 3.
As shown in Figure 3, for four road binaural audio signals being controlled the circuit diagram of switching.Its concrete course of work is as follows: when control signal switch1=0, control signal switch2=1, control signal switch3=1, control signal switch4=1, select output L channel input signal 1 and R channel input signal 1; When control signal switch1=1, control signal switch2=0, control signal switch3=1, control signal switch4=1, select output L channel input signal 2 and R channel input signal 2; When control signal switch1=1, control signal switch2=1, control signal switch3=0, control signal switch4=1, select output L channel input signal 3 and R channel input signal 3; When control signal switch1=1, control signal switch2=1, control signal switch3=1, control signal switch4=0, select output L channel input signal 4 and R channel input signal 4.
Circuit structure of the present utility model can decide the operating position of circuit by that analogy fully according to actual needs, does not waste to reach used to make the best.
Claims (5)
1, a kind of multichannel dual-channel audio commutation circuit is characterized in that, comprising:
A plurality of every road audio signal input end of dual track and control switching circuits between the audio signal output end of being connected to, this control switching circuit comprises:
L channel emitter follower and R channel emitter follower, its base stage couple the L channel input signal and the R channel input signal of this road audio input signal respectively by electric capacity, its collector electrode connects external power supply, and emitter connects audio signal output end;
L channel switching transistor and R channel switching transistor, its collector electrode connects the base stage of L channel emitter follower or R channel emitter follower respectively, and connects external power supply by resistance respectively, and its grounded emitter;
Be used to send the control signal gating wherein one road audio signal output to the controller of audio signal output end, it has a plurality of control ends that send control signal, and each control end connects the base stage of the L channel switching transistor in one road control switching circuit wherein and the base stage of R channel switching transistor respectively.
2, multichannel dual-channel audio commutation circuit according to claim 1, it is characterized in that described control switching circuit also comprises: be connected between the emitter of the base stage of L channel emitter follower and L channel switching transistor, L channel shunt capacitance and R channel shunt capacitance between the emitter of the base stage of R channel emitter follower and R channel switching transistor.
3, multichannel dual-channel audio commutation circuit according to claim 2, it is characterized in that described control switching circuit also comprises: be connected between L channel input signal and the L channel coupling capacitance, L channel divider resistance and R channel divider resistance between R channel input signal and the R channel coupling capacitance.
4, multichannel dual-channel audio commutation circuit according to claim 1 is characterized in that, described L channel divider resistance and described R channel divider resistance include: first resistance that is connected in series with L channel coupling capacitance or R channel coupling capacitance respectively; The one terminal common port that connects first resistance and L channel coupling capacitance or R channel coupling capacitance, second resistance of another terminal ground connection.
5, multichannel dual-channel audio commutation circuit according to claim 1 is characterized in that, described L channel emitter follower, described R channel emitter follower, described L channel switching transistor and described R channel switching transistor are NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200934514U CN201185409Y (en) | 2008-04-16 | 2008-04-16 | Multipath double track audio commutation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200934514U CN201185409Y (en) | 2008-04-16 | 2008-04-16 | Multipath double track audio commutation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201185409Y true CN201185409Y (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200934514U Expired - Fee Related CN201185409Y (en) | 2008-04-16 | 2008-04-16 | Multipath double track audio commutation circuit |
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| CN (1) | CN201185409Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105592274A (en) * | 2015-12-24 | 2016-05-18 | 四川迪佳通电子有限公司 | Set top box sound channel mixing selection circuit and method |
| CN108200518A (en) * | 2018-03-07 | 2018-06-22 | 合肥惠科金扬科技有限公司 | A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise |
-
2008
- 2008-04-16 CN CNU2008200934514U patent/CN201185409Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105592274A (en) * | 2015-12-24 | 2016-05-18 | 四川迪佳通电子有限公司 | Set top box sound channel mixing selection circuit and method |
| WO2017107971A1 (en) * | 2015-12-24 | 2017-06-29 | 深圳市九洲电器有限公司 | Circuit and method for selecting audio channel of set-top box and mixing audio thereof |
| CN105592274B (en) * | 2015-12-24 | 2018-08-10 | 四川迪佳通电子有限公司 | Set-top box sound channel mixes selection circuit and method |
| CN108200518A (en) * | 2018-03-07 | 2018-06-22 | 合肥惠科金扬科技有限公司 | A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise |
| CN108200518B (en) * | 2018-03-07 | 2024-04-12 | 合肥惠科金扬科技有限公司 | Audio circuit and audio equipment for eliminating instant noise during power-on |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090121 Termination date: 20110416 |