CN202150929U - Audio device and audio switching circuit thereof - Google Patents
Audio device and audio switching circuit thereof Download PDFInfo
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- CN202150929U CN202150929U CN201120248043U CN201120248043U CN202150929U CN 202150929 U CN202150929 U CN 202150929U CN 201120248043 U CN201120248043 U CN 201120248043U CN 201120248043 U CN201120248043 U CN 201120248043U CN 202150929 U CN202150929 U CN 202150929U
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Abstract
The utility model discloses an audio device and an audio switching circuit thereof. The audio switching circuit is characterized in that: an audio output interface is grounded through a first resistor and a first capacitor in order, a connection point of the first resistor and the first capacitor is connected with a base electrode of a first triode through a second resistor, an emitting electrode of the first triode is grounded, a collector electrode of the first triode is connected with a high level through a third resistor, the collector electrode of the first triode is also connected with a base electrode of a second triode through a fourth resistor, an emitting electrode of the second triode is connected with the high level, a collector electrode of the second triode is connected with a base electrode of a third triode through a fifth resistor, an emitting electrode of the third triode is grounded, and a collector electrode of the third triode is connected to a left channel audio input interface through a seventh resistor and a second capacitor in order. By adopting the technical scheme of the utility model, the audio device can realize switching between an audio output and an audio input without using an electronic switch, thus the audio device has a low cost.
Description
Technical field
The utility model relates to audio frequency and switches, and relates in particular to a kind of audio frequency apparatus and frequency switch circuit thereof.
Background technology
Audio frequency apparatus all has two passages: output audio passage and input voice-grade channel.In use, the user need freely be switched between two passages usually, and prior art adopts electronic switch to accomplish this switching more, but the electronic switch price is more expensive, thereby has increased the cost of audio frequency apparatus.
The utility model content
The technical problem that the utility model will solve is that more expensive to the above-mentioned electronic switch price of prior art, the defective that the audio frequency apparatus cost is big provides a kind of cost low frequency switch circuit.
The utility model solves the technical scheme that its technical problem adopted: construct a kind of frequency switch circuit; Be connected in audio output interface, L channel audio input interface and right audio channel input interface; It is characterized in that; Said frequency switch circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, first triode, second triode, the 3rd triode and the 4th triode, and wherein, said audio output interface is successively through first resistance and first capacity earth; The tie point of first resistance and first electric capacity connects the base stage of first triode through second resistance; The grounded emitter of first triode, the collector electrode of first triode connects high level through the 3rd resistance, and the collector electrode of first triode also connects the base stage of second triode through the 4th resistance; The emitter of second triode connects high level; The collector electrode of second triode connects the base stage of the 3rd triode through the 5th resistance, the grounded emitter of the 3rd triode, and the collector electrode of the 3rd triode connects the L channel audio input interface through the 7th resistance and second electric capacity successively; The collector electrode of second triode also connects the base stage of the 4th triode through the 6th resistance, the grounded emitter of the 4th triode, and the collector electrode of the 4th triode connects the right audio channel input interface through the 8th resistance and the 3rd electric capacity successively.
The utility model is also constructed a kind of audio frequency apparatus; Comprise the Audio Processing chip; Said Audio Processing chip comprises audio output interface, L channel audio input interface and right audio channel input interface; Said audio frequency apparatus also comprises frequency switch circuit; Said frequency switch circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, first triode, second triode, the 3rd triode and the 4th triode, and wherein, said audio output interface is successively through first resistance and first capacity earth; The tie point of first resistance and first electric capacity connects the base stage of first triode through second resistance; The grounded emitter of first triode, the collector electrode of first triode connects high level through the 3rd resistance, and the collector electrode of first triode also connects the base stage of second triode through the 4th resistance; The emitter of second triode connects high level; The collector electrode of second triode connects the base stage of the 3rd triode through the 5th resistance, the grounded emitter of the 3rd triode, and the collector electrode of the 3rd triode connects the L channel audio input interface through the 7th resistance and second electric capacity successively; The collector electrode of second triode also connects the base stage of the 4th triode through the 6th resistance, the grounded emitter of the 4th triode, and the collector electrode of the 4th triode connects the right audio channel input interface through the 8th resistance and the 3rd electric capacity successively.
In the described audio frequency apparatus of the utility model, said audio output interface is L channel audio output interface or right audio channel output interface.
Implement the technical scheme of the utility model, make audio frequency apparatus need not to use electronic switch can realize the switching of audio output signal and audio input signal, so cost is low.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the circuit diagram of the utility model frequency switch circuit embodiment.
Embodiment
At first explanation is, the audio signal of exporting from the audio output interface of Audio Processing chip comprises alternating component and flip-flop, and the utility model is exactly to utilize the flip-flop in the audio signal to cut off extraneous audio input signal, specifies below.
As shown in Figure 1; In the circuit diagram of the utility model frequency switch circuit embodiment; Audio output interface is successively through first resistance R 271 and first capacitor C, 55 ground connection, and the tie point of first resistance R 271 and first capacitor C 55 connects the base stage of the first triode Q23, the grounded emitter of the first triode Q23 through second resistance R 272; The collector electrode of the first triode Q23 connects high level through the 3rd resistance R 81; The collector electrode of the first triode Q23 also connects the base stage of the second triode Q21 through the 4th resistance R 78, the emitter of the second triode Q21 connects high level, and the collector electrode of the second triode Q21 connects the base stage of the 3rd triode Q22 through the 5th resistance R 72; The grounded emitter of the 3rd triode Q22, the collector electrode of the 3rd triode Q22 connect the L channel audio input interface through the 7th resistance R 73 and second capacitor C 32 successively; The collector electrode of the second triode Q21 also connects the base stage of the 4th triode Q20 through the 6th resistance R 76; The grounded emitter of the 4th triode Q20, the collector electrode of the 4th triode Q20 connect the right audio channel input interface through the 8th resistance R 79 and the 3rd capacitor C 35 successively.
The operation principle of this frequency switch circuit is described below: when audio signal output; The flip-flop of the audio signal of output is high level, and L channel audio output interface this moment (AL) is a high level (should be noted that equally here and can judge with the right audio channel output interface); Triode Q23 conducting; The current collection of triode Q23 is high level very, triode Q21 conducting, and the current collection of triode Q21 is high level very; And then make triode Q22, Q20 conducting; The current collection of triode Q22, Q20 is low level very, thereby makes L channel audio input interface (A-IN-L), right audio channel input interface (A-IN-R) be changed to low level, has so just cut off the input of external audio signal.Close the audio frequency of output when needs; And will open when importing audio frequency, can close audio frequency output earlier, then the flip-flop of the audio signal of output is low level (can judge with the right audio channel output interface equally); Triode Q23, Q21 respectively by; Thereby make triode Q22, Q20 by, L channel audio input interface (A-IN-L), right audio channel input interface (A-IN-R) are not connected to ground like this, but external audio signal normal transmission is to the Audio Processing chip.
The utility model is also constructed a kind of audio frequency apparatus; Comprise the Audio Processing chip; This Audio Processing chip comprises audio output interface and L channel audio input interface and right audio channel input interface; This audio frequency apparatus also comprises the frequency switch circuit among the top embodiment, specifically please with reference to the description of preceding text, repeats no more at this.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the utility model.
Claims (3)
1. frequency switch circuit; Be connected in audio output interface, L channel audio input interface and right audio channel input interface; It is characterized in that; Said frequency switch circuit comprises first resistance (R271), second resistance (R272), the 3rd resistance (R81), the 4th resistance (R78), the 5th resistance (R72), the 6th resistance (R76), the 7th resistance (R73), the 8th resistance (R79), first electric capacity (C55), second electric capacity (C32), the 3rd electric capacity (C35), first triode (Q23), second triode (Q21), the 3rd triode (Q22) and the 4th triode (Q20); Wherein, Said audio output interface is successively through first resistance (R271) and first electric capacity (C55) ground connection; The tie point of first resistance (R271) and first electric capacity (C55) connects the base stage of first triode (Q23) through second resistance (R272); The grounded emitter of first triode (Q23); The collector electrode of first triode (Q23) connects high level through the 3rd resistance (R81); The collector electrode of first triode (Q23) also connects the base stage of second triode (Q21) through the 4th resistance (R78), the emitter of second triode (Q21) connects high level, and the collector electrode of second triode (Q21) connects the base stage of the 3rd triode (Q22) through the 5th resistance (R72); The grounded emitter of the 3rd triode (Q22), the collector electrode of the 3rd triode (Q22) connect the L channel audio input interface through the 7th resistance (R73) and second electric capacity (C32) successively; The collector electrode of second triode (Q21) also connects the base stage of the 4th triode (Q20) through the 6th resistance (R76); The grounded emitter of the 4th triode (Q20), the collector electrode of the 4th triode (Q20) connect the right audio channel input interface through the 8th resistance (R79) and the 3rd electric capacity (C35) successively.
2. audio frequency apparatus; Comprise the Audio Processing chip; Said Audio Processing chip comprises audio output interface, L channel audio input interface and right audio channel input interface; It is characterized in that; Said audio frequency apparatus also comprises frequency switch circuit; Said frequency switch circuit comprises first resistance (R271), second resistance (R272), the 3rd resistance (R81), the 4th resistance (R78), the 5th resistance (R72), the 6th resistance (R76), the 7th resistance (R73), the 8th resistance (R79), first electric capacity (C55), second electric capacity (C32), the 3rd electric capacity (C35), first triode (Q23), second triode (Q21), the 3rd triode (Q22) and the 4th triode (Q20); Wherein, Said audio output interface is successively through first resistance (R271) and first electric capacity (C55) ground connection, and the tie point of first resistance (R271) and first electric capacity (C55) connects the base stage of first triode (Q23), the grounded emitter of first triode (Q23) through second resistance (R272); The collector electrode of first triode (Q23) connects high level through the 3rd resistance (R81); The collector electrode of first triode (Q23) also connects the base stage of second triode (Q21) through the 4th resistance (R78), the emitter of second triode (Q21) connects high level, and the collector electrode of second triode (Q21) connects the base stage of the 3rd triode (Q22) through the 5th resistance (R72); The grounded emitter of the 3rd triode (Q22), the collector electrode of the 3rd triode (Q22) connect the L channel audio input interface through the 7th resistance (R73) and second electric capacity (C32) successively; The collector electrode of second triode (Q21) also connects the base stage of the 4th triode (Q20) through the 6th resistance (R76); The grounded emitter of the 4th triode (Q20), the collector electrode of the 4th triode (Q20) connect the right audio channel input interface through the 8th resistance (R79) and the 3rd electric capacity (C35) successively.
3. audio frequency apparatus according to claim 2 is characterized in that, said audio output interface is L channel audio output interface or right audio channel output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120248043U CN202150929U (en) | 2011-07-14 | 2011-07-14 | Audio device and audio switching circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120248043U CN202150929U (en) | 2011-07-14 | 2011-07-14 | Audio device and audio switching circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202150929U true CN202150929U (en) | 2012-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120248043U Expired - Fee Related CN202150929U (en) | 2011-07-14 | 2011-07-14 | Audio device and audio switching circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202150929U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701089A (en) * | 2013-12-31 | 2014-04-02 | 昌辉汽车转向系统（黄山）有限公司 | Hardware overload or short circuit protection circuit and DC (Direct Current) power supply circuit |
-
2011
- 2011-07-14 CN CN201120248043U patent/CN202150929U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701089A (en) * | 2013-12-31 | 2014-04-02 | 昌辉汽车转向系统（黄山）有限公司 | Hardware overload or short circuit protection circuit and DC (Direct Current) power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120222 Termination date: 20160714 |