CN203136138U - Audio signal input converting circuit and audio player - Google Patents
Audio signal input converting circuit and audio player Download PDFInfo
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- CN203136138U CN203136138U CN201220736603.4U CN201220736603U CN203136138U CN 203136138 U CN203136138 U CN 203136138U CN 201220736603 U CN201220736603 U CN 201220736603U CN 203136138 U CN203136138 U CN 203136138U
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Abstract
The utility model discloses an audio signal input converting circuit and an audio player having the audio signal input converting circuit. The audio signal input converting circuit comprises an audio input terminal, a first electronic switch, a second electronic switch, a first audio output terminal, a second audio output terminal, an attenuation resistor, and a control chip, wherein the audio input terminal is connected with the first audio output terminal through the first electronic switch and connected with the second audio output terminal through the attenuation resistor; a connection point of the attenuation resistor and the second audio output terminal is grounded through the second electronic switch. The control chip is respectively connected with control terminals of the first electronic switch and the second electronic switch and controls the working states of the first electronic switch and the second electronic switch according to a signal source input by the audio input terminal. The audio signal input converting circuit realizes the switching of audio signal input, and the cost of the circuit is reduced.
Description
Technical field
The utility model relates to technical field of electronic products, particularly a kind of audio signal input change-over circuit and audio player.
Background technology
In the present consumer electronics product (especially in portable product), microphone and outer audio equipment need be by independently audio frequency input seat inputs respectively.Owing to be provided with two audio frequency input seat, need to design two audio signal input circuits simultaneously and the signal of two audio frequency input seats is transferred to respectively carry out audio frequency in the power amplifier module and play, therefore make that the cost of circuit is higher, need improvement badly.
The utility model content
Main purpose of the present utility model is to provide a kind of audio signal input change-over circuit, is intended to realize the switching of audio signal input, has reduced the cost of circuit.
To achieve these goals, the utility model provides a kind of audio signal input change-over circuit, described audio signal input change-over circuit comprises audio input end, first electronic switch, second electronic switch, first audio output, second audio output, damping resistance and control chip, wherein audio input end is connected with described first audio output by first electronic switch, and is connected with described second audio output by damping resistance; The junction of damping resistance and second audio output is by the second electronic switch ground connection; Control chip is connected with the control end of described first electronic switch and second electronic switch respectively, and controls the operating state of first electronic switch and second electronic switch according to the signal source of audio input end input.
Preferably, also connect an audio frequency between described first electronic switch and first audio output and amplify electronic circuit.
Preferably, described audio input end comprises the first sound channel input and second sound channel input, described damping resistance comprises first damping resistance and second damping resistance, wherein the first sound channel input is connected with first audio output by first damping resistance, and the second sound channel input is connected with first audio output by second damping resistance; The end that described second damping resistance is connected with the second sound channel input is connected with described first electronic switch, and the end that described second damping resistance is connected with first audio output is connected with described second electronic switch.
Preferably, described first electronic switch comprises first triode, second triode, first electric capacity, second electric capacity, first resistance, second resistance and the 3rd resistance, wherein first triode is the NPN triode, its collector electrode is connected to the end that described second damping resistance is connected with the second sound channel input by first electric capacity, emitter amplifies electronic circuit by second electric capacity and described audio frequency and is connected, and base stage is connected with the collector electrode of second triode by first resistance; Second triode is the PNP triode, and it launches the control end of very described first electronic switch, and is connected with the control signal output of described control chip, and base stage is by second grounding through resistance; One end of the 3rd resistance is connected other end ground connection with the emitter of described first triode.
Preferably, described second electronic switch comprises the 3rd triode, the 4th triode, the 4th resistance, the 5th resistance and the 3rd electric capacity, wherein the 3rd triode is the PNP triode, the control end of very described second electronic switch of its emission, collector electrode is connected with the base stage of described the 4th triode by the 4th resistance, and base stage is by the 5th grounding through resistance; The 4th triode is the NPN triode, its grounded emitter, and collector electrode is connected to the end that described second damping resistance is connected with first audio output; One end of the 3rd electric capacity is connected other end ground connection with the emitter of described the 3rd triode.
Preferably, described audio frequency amplifies electronic circuit and comprises the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity, first operational amplifier and second operational amplifier, wherein the inverting input of first operational amplifier is connected with described second electric capacity by the 6th resistance, and by the 4th capacity earth, be connected with its output by the 7th resistance, in-phase input end is respectively by the 8th resistance and the 5th capacity earth, and be connected with positive source with the tenth resistance by the 9th resistance of series connection successively, output passes through the 6th electric capacity and is connected with the in-phase input end of described second operational amplifier; The 7th electric capacity is parallel to the two ends of described the 7th resistance; The end that described the 9th resistance is connected with the tenth resistance is connected with the power end of described first operational amplifier and the power end of described second operational amplifier respectively; The output of second operational amplifier is connected with described first audio output by the 8th electric capacity, and inverting input is connected with its output with the 9th electric capacity by the 11 resistance respectively; One end of the 12 resistance is connected with the inverting input of described second operational amplifier, and the other end is by the tenth capacity earth; One end of the 13 resistance is connected with the in-phase input end of described second operational amplifier, and the other end is connected with the in-phase input end of described first operational amplifier; One end of the 11 electric capacity is connected with the in-phase input end of described second operational amplifier, other end ground connection.
Preferably, described audio input end is the audio frequency input seat of 3.5mm.
The utility model also provides a kind of audio player, this audio player comprises audio signal input change-over circuit, this audio signal input change-over circuit comprises audio input end, first electronic switch, second electronic switch, first audio output, second audio output, damping resistance and control chip, wherein audio input end is connected with described first audio output by first electronic switch, and is connected with described second audio output by damping resistance; The junction of damping resistance and second audio output is by the second electronic switch ground connection; Control chip is connected with the control end of described first electronic switch and second electronic switch respectively, and controls the operating state of first electronic switch and second electronic switch according to the signal source of audio input end input.
The audio signal input change-over circuit that the utility model provides, when insert from audio input end be other audio signals of non-microphone input the time, control chip will export that control signal is controlled first electronic switch and second electronic switch is in cut-off state, at this moment, the audio signal of audio input end input exports power amplifier through behind the damping resistance to from second audio output.When insert from audio input end be the audio signal of microphone input the time, control chip will export that control signal is controlled first electronic switch and second electronic switch is in conducting state, at this moment, the audio signal of audio input end input exports power amplifier to from first audio output after through first electronic switch.Because the audio signal that the utility model provides input change-over circuit has been realized the switching of audio signal input, thereby can reduce the quantity of audio frequency input seat, be conducive to the miniaturization design of product; Reduce the components and parts of audio signal input circuit simultaneously, and then reduced the cost of circuit.
Description of drawings
Fig. 1 is the structural representation of the utility model audio signal input change-over circuit preferred embodiment;
Fig. 2 is the circuit diagram of the utility model audio signal input change-over circuit preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
With reference to Fig. 1, Fig. 1 is the structural representation of the utility model audio signal input change-over circuit preferred embodiment.The audio signal input change-over circuit that present embodiment provides comprises audio input end 10, first electronic switch 20, second electronic switch 30, first audio output 40, second audio output 50, damping resistance 60 and control chip 70, wherein audio input end 10 is connected with first audio output 40 by first electronic switch 20, and is connected with second audio output 50 by damping resistance 60; The junction of damping resistance 60 and second audio output 50 is by second electronic switch, 30 ground connection; Control chip 70 is connected with the control end of first electronic switch 20 and second electronic switch 30 respectively, and controls the operating state of first electronic switch 20 and second electronic switch 30 according to the signal source of audio input end 10 inputs.
In the present embodiment, above-mentioned signal source comprises microphone and other audio signal input source (as, the audio signal of computer output), the audio frequency input that above-mentioned audio input end 10 be 3.5mm.
The audio signal input change-over circuit that the utility model provides, when insert from audio input end 10 be other audio signals of non-microphone input the time, control chip 70 will export that control signal is controlled first electronic switch 20 and second electronic switch 30 is in cut-off state, at this moment, the audio signal of audio input end 10 inputs exports power amplifier through damping resistance 60 backs to from second audio output 50.When insert from audio input end 10 be the audio signal of microphone input the time, control chip 70 will export that control signal is controlled first electronic switch 20 and second electronic switch 30 is in conducting state, at this moment, the audio signal of audio input end 10 inputs exports power amplifier through first electronic switch, 20 backs to from first audio output 40.Because the audio signal that the utility model provides input change-over circuit has been realized the switching of audio signal input, thereby can reduce the quantity of audio frequency input seat, be conducive to the miniaturization design of product; Reduce the components and parts of audio signal input circuit simultaneously, and then reduced the cost of circuit.
Further, also connect an audio frequency between above-mentioned first electronic switch 20 and first audio output 40 and amplify electronic circuit 80.
Because after audio signal that audio frequency amplifies 80 pairs of above-mentioned microphones inputs of electronic circuit is set amplifies, again by 40 outputs of first audio output, carry out audio frequency and play, thereby can prevent from therefore can improving the effect that audio frequency is play because of the more weak dropout that produces of audio signal by the microphone input.
In conjunction with seeing figures.1.and.2, Fig. 2 is the circuit diagram of the utility model audio signal input change-over circuit one embodiment.Based on above-described embodiment, in the present embodiment, above-mentioned audio input end 10 comprises the first sound channel input L and second sound channel input R, above-mentioned damping resistance 60 comprises first damping resistance 61 and second damping resistance 62, wherein the first sound channel input L is connected with first audio output 40 by first damping resistance 61, and second sound channel input R is connected with first audio output 40 by second damping resistance 62; The end that second damping resistance 62 is connected with second sound channel input R is connected with first electronic switch 20, and the end that second damping resistance 62 is connected with first audio output 40 is connected with second electronic switch 30.
In the present embodiment, above-mentioned first electronic switch 20 comprises the first triode Q1, the second triode Q2, first capacitor C 1, second capacitor C 2, first resistance R 1, second resistance R 2 and the 3rd resistance R 3, wherein the first triode Q1 is the NPN triode, its collector electrode is connected to the end that second damping resistance 62 is connected with second sound channel input R by first capacitor C 1, emitter amplifies electronic circuit 80 by second capacitor C 2 and audio frequency and is connected, and base stage is connected with the collector electrode of the second triode Q2 by first resistance R 1; The second triode Q2 is the PNP triode, and its emission is the control end of first electronic switch 20 very, and is connected with the control signal output of control chip 70, and base stage is by second resistance R, 2 ground connection; One end of the 3rd resistance R 3 is connected other end ground connection with the emitter of the first triode Q1.
Above-mentioned second electronic switch 30 comprises the 3rd triode Q3, the 4th triode Q4, the 4th resistance R 4, the 5th resistance R 5 and the 3rd capacitor C 3, wherein the 3rd triode Q3 is the PNP triode, its emission is the control end of second electronic switch 30 very, collector electrode is connected with the base stage of the 4th triode Q4 by the 4th resistance R 4, and base stage is by the 5th resistance R 5 ground connection; The 4th triode is the NPN triode, its grounded emitter, and collector electrode is connected to the end that second damping resistance 62 is connected with first audio output 40; One end of the 3rd capacitor C 3 is connected other end ground connection with the emitter of the 3rd triode Q3.
Should be noted that in the present embodiment that above-mentioned control chip 70 is controlled the operating state of first electronic switch 20 and second electronic switch 30 according to the signal source of audio input end 10 inputs.Particularly, control chip 70 can be judged the signal source of audio input end 10 inputs according to the operational order of user's input.For example, be common input pattern when the user selects current input pattern by function selecting key, namely Shu Ru signal source is other audio input device (as computer) of non-microphone input.At this moment, then control chip 70 is exported the control end of low level signal to the first electronic switch 20 and the control end of second electronic switch 30 respectively with the control signal output, thereby makes the second triode Q2 end, and causes the first triode Q1 to end; Make the 3rd triode Q3 end simultaneously, cause the 4th triode Q4 to end.Therefore will be directly by behind the damping resistance 60, from 50 outputs of second audio output by the computer input audio signal.
Be the microphone input pattern when the user selects current input pattern by function selecting key, namely Shu Ru signal source is microphone.At this moment, then control chip 70 is exported the control end of high level signal to the first electronic switch 20 and the control end of second electronic switch 30 respectively with the control signal output, thereby make the second triode Q2 conducting, cause the first triode Q1 conducting, audio signal by the microphone input will export in the audio frequency amplification electronic circuit 80 by the first triode Q1, after audio frequency amplification electronic circuit 80 carries out the signal amplification, from first signal output part 40; Make simultaneously the 3rd triode Q3 conducting to cause the 4th triode Q4 conducting that the audio signal of importing by microphone will arrive ground through the 4th triode Q4 by behind second damping resistance 62.
Particularly, above-mentioned audio frequency amplification electronic circuit 80 comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, the 9th capacitor C 9, the tenth capacitor C 10, the 11 capacitor C 11, the first operational amplifier U1 and the second operational amplifier U2.Wherein the inverting input of the first operational amplifier U1 is connected with second capacitor C 2 by the 6th resistance R 6, and by the 4th capacitor C 4 ground connection, be connected with its output by the 7th resistance R 7, in-phase input end is respectively by the 8th resistance R 8 and the 5th capacitor C 5 ground connection, and be connected with positive source VCC with the tenth resistance R 10 by the 9th resistance R 9 of series connection successively, output passes through the 6th capacitor C 6 and is connected with the in-phase input end of the second operational amplifier U2; The 7th capacitor C 7 is parallel to the two ends of the 7th resistance R 7; The end that the 9th resistance R 9 is connected with the tenth resistance R 10 is connected with the power end of the first operational amplifier U1 and the power end of the second operational amplifier U2 respectively; The output of the second operational amplifier U2 is connected with described first audio output 40 by the 8th capacitor C 8, and inverting input is connected with its output with the 9th capacitor C 9 by the 11 resistance R 11 respectively; One end of the 12 resistance R 12 is connected with the inverting input of the described second operational amplifier U2, and the other end is by the tenth capacitor C 10 ground connection; One end of the 13 resistance R 13 is connected with the in-phase input end of the described second operational amplifier U2, and the other end is connected with the in-phase input end of the first operational amplifier U1; One end of the 11 capacitor C 11 is connected with the in-phase input end of the described second operational amplifier U2, other end ground connection.
The utility model also provides a kind of audio player, and this audio player comprises audio signal input change-over circuit, and structure and the principle of this audio signal input change-over circuit can not repeat them here with reference to above-described embodiment.Naturally, because the audio player of present embodiment has adopted the technical scheme of above-mentioned audio signal input change-over circuit, so this audio player has all beneficial effects of above-mentioned audio signal input change-over circuit.
It below only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (8)
1. an audio signal is imported change-over circuit, it is characterized in that, comprise audio input end, first electronic switch, second electronic switch, first audio output, second audio output, damping resistance and control chip, wherein audio input end is connected with described first audio output by first electronic switch, and is connected with described second audio output by damping resistance; The junction of damping resistance and second audio output is by the second electronic switch ground connection; Control chip is connected with the control end of described first electronic switch and second electronic switch respectively, and controls the operating state of first electronic switch and second electronic switch according to the signal source of audio input end input.
2. audio signal input change-over circuit as claimed in claim 1 is characterized in that, also connects an audio frequency between described first electronic switch and first audio output and amplifies electronic circuit.
3. audio signal as claimed in claim 1 is imported change-over circuit, it is characterized in that, described audio input end comprises the first sound channel input and second sound channel input, described damping resistance comprises first damping resistance and second damping resistance, wherein the first sound channel input is connected with first audio output by first damping resistance, and the second sound channel input is connected with first audio output by second damping resistance; The end that described second damping resistance is connected with the second sound channel input is connected with described first electronic switch, and the end that described second damping resistance is connected with first audio output is connected with described second electronic switch.
4. audio signal as claimed in claim 3 is imported change-over circuit, it is characterized in that, described first electronic switch comprises first triode, second triode, first electric capacity, second electric capacity, first resistance, second resistance and the 3rd resistance, wherein first triode is the NPN triode, its collector electrode is connected to the end that described second damping resistance is connected with the second sound channel input by first electric capacity, emitter amplifies electronic circuit by second electric capacity and described audio frequency and is connected, and base stage is connected with the collector electrode of second triode by first resistance; Second triode is the PNP triode, and it launches the control end of very described first electronic switch, and is connected with the control signal output of described control chip, and base stage is by second grounding through resistance; One end of the 3rd resistance is connected other end ground connection with the emitter of described first triode.
5. audio signal as claimed in claim 4 is imported change-over circuit, it is characterized in that, described second electronic switch comprises the 3rd triode, the 4th triode, the 4th resistance, the 5th resistance and the 3rd electric capacity, wherein the 3rd triode is the PNP triode, the control end of very described second electronic switch of its emission, collector electrode is connected with the base stage of described the 4th triode by the 4th resistance, and base stage is by the 5th grounding through resistance; The 4th triode is the NPN triode, its grounded emitter, and collector electrode is connected to the end that described second damping resistance is connected with first audio output; One end of the 3rd electric capacity is connected other end ground connection with the emitter of described the 3rd triode.
6. audio signal as claimed in claim 5 is imported change-over circuit, it is characterized in that, described audio frequency amplifies electronic circuit and comprises the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity, first operational amplifier and second operational amplifier, wherein the inverting input of first operational amplifier is connected with described second electric capacity by the 6th resistance, and by the 4th capacity earth, be connected with its output by the 7th resistance, in-phase input end is respectively by the 8th resistance and the 5th capacity earth, and be connected with positive source with the tenth resistance by the 9th resistance of series connection successively, output passes through the 6th electric capacity and is connected with the in-phase input end of described second operational amplifier; The 7th electric capacity is parallel to the two ends of described the 7th resistance; The end that described the 9th resistance is connected with the tenth resistance is connected with the power end of described first operational amplifier and the power end of described second operational amplifier respectively; The output of second operational amplifier is connected with described first audio output by the 8th electric capacity, and inverting input is connected with its output with the 9th electric capacity by the 11 resistance respectively; One end of the 12 resistance is connected with the inverting input of described second operational amplifier, and the other end is by the tenth capacity earth; One end of the 13 resistance is connected with the in-phase input end of described second operational amplifier, and the other end is connected with the in-phase input end of described first operational amplifier; One end of the 11 electric capacity is connected with the in-phase input end of described second operational amplifier, other end ground connection.
7. as each described audio signal input change-over circuit in the claim 1 to 6, it is characterized in that described audio input end is the audio frequency input seat of 3.5mm.
8. an audio player is characterized in that, comprises as each described audio signal input change-over circuit in the claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220736603.4U CN203136138U (en) | 2012-12-27 | 2012-12-27 | Audio signal input converting circuit and audio player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220736603.4U CN203136138U (en) | 2012-12-27 | 2012-12-27 | Audio signal input converting circuit and audio player |
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| Publication Number | Publication Date |
|---|---|
| CN203136138U true CN203136138U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220736603.4U Expired - Fee Related CN203136138U (en) | 2012-12-27 | 2012-12-27 | Audio signal input converting circuit and audio player |
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| Country | Link |
|---|---|
| CN (1) | CN203136138U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113131931A (en) * | 2021-04-27 | 2021-07-16 | 中安智联未来有限公司 | Analog input and output hybrid circuit |
-
2012
- 2012-12-27 CN CN201220736603.4U patent/CN203136138U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113131931A (en) * | 2021-04-27 | 2021-07-16 | 中安智联未来有限公司 | Analog input and output hybrid circuit |
| CN113131931B (en) * | 2021-04-27 | 2024-05-07 | 中安智联未来有限公司 | Analog input/output hybrid circuit |
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| C14 | Grant of patent or utility model | ||
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| 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: 20130814 Termination date: 20201227 |