CN204810528U - Converting circuit based on input of bluetooth audio frequency source - Google Patents
Converting circuit based on input of bluetooth audio frequency source Download PDFInfo
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- CN204810528U CN204810528U CN201520525641.9U CN201520525641U CN204810528U CN 204810528 U CN204810528 U CN 204810528U CN 201520525641 U CN201520525641 U CN 201520525641U CN 204810528 U CN204810528 U CN 204810528U
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Abstract
The utility model relates to a converting circuit based on input of bluetooth audio frequency source (b). It includes MIC audio input circuit, AUX audio input interface circuit, audio frequency source conversion selection circuit and bluetooth control module group, and audio frequency source conversion selection circuit is equipped with MIC mode and AUX mode, bluetooth control module group control audio source conversion selection circuit's mode, when being in the MIC mode, the bluetooth control module group provides offset voltage to the MIC audio input circuit, its audio signal passes through audio frequency source converting circuit and carries to the bluetooth control module group again, the bluetooth control module group is equipped with a control end that is used for responding to the AUX audio signal input, when the AUX audio frequency input interface circuit has the AUX audio signal input, bluetooth module control audio source conversion selection circuit gets into the AUX mode, AUX audio signal passes through audio frequency source conversion selection circuit input bluetooth control module group. The utility model discloses accessible bluetooth module control AUX audio signal saves the cost.
Description
Technical field
The utility model relates to radio circuit technical field, specifically, relates to
a kind of change-over circuit based on the input of Bluetooth audio frequency source.
Background technology
Along with the development of ear phone technology, in use, both can be connected by tone frequency channel wire, and also can carry out wireless connections by bluetooth, arrange according to the actual requirements; Current earphone cord is generally all equipped with MIC module, while audio reception, and can simultaneously sounding; When earphone is externally sent MIC voice signal by bluetooth module or received voice signal, adjust volume, audio signal by bluetooth module.When being connected by tone frequency channel wire, audio signal, without bluetooth module, is directly cut in earphone, and by extra arrange audio frequency processing IC carries out volume, audio frequency EQ regulates.Relatively independent with bluetooth module, cause bluetooth module to become Redundancy Design, cost is higher.
Summary of the invention
The purpose of this utility model is to solve the deficiencies in the prior art, and provide a kind of change-over circuit based on the input of Bluetooth audio frequency source, this change-over circuit can make bluetooth module control the audio signal accessed by tone frequency channel wire, thus reduces costs.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of change-over circuit based on the input of Bluetooth audio frequency source, comprise MIC audio input circuit, AUX audio input interface circuit, audio-source conversion selection circuit and Bluetooth control module, audio-source conversion selection circuit is provided with two kinds of mode of operations, and two kinds of mode of operations are MIC pattern and AUX pattern, Bluetooth control module is connected with audio conversion selection circuit signal, and control the mode of operation of audio-source conversion selection circuit, when being in MIC pattern, Bluetooth control module provides bias voltage to MIC audio input circuit, the audio signal of MIC audio input circuit is delivered to Bluetooth control module again by audio-source change-over circuit, Bluetooth control module is provided with a control end for responding to the input of AUX audio signal, when AUX audio input interface circuit has AUX audio signal to input, bluetooth module controls audio-source conversion selection circuit and enters AUX pattern, AUX audio signal is by audio-source conversion selection circuit input Bluetooth control module.
Further, audio-source conversion selection circuit comprises chip U1 and chip U2, chip U1 power end pin VCC is connected with power supply Vin respectively with chip U2 power end pin VCC, and chip U1 power end pin VCC and chip U2 power end pin VCC is respectively by electric capacity C9, electric capacity C10 ground connection; The S of chip U1 holds the S of pin and chip U2 to hold pin all by resistance R2 ground connection, and the S of chip U1 holds pin to hold pin to hold pin signal to be connected with the BT_Module_I/O2 of Bluetooth control module with the S of chip U2; The A of chip U1 holds pin to hold pin to be connected with BT_Module_LineLN, BT_Module_LineLP signal of Bluetooth control module respectively with the A of chip U2, and the B2 of chip U1 holds pin to hold pin to be connected with two outputs of MIC audio input circuit respectively with the B2 of chip U2; The B1 of chip U1 holds pin by electric capacity C5 ground connection, and the B1 of chip U2 holds pin to be connected with an output end signal of AUX audio input interface circuit.
Further, MIC audio input circuit comprises MIC, and MIC is connected with pseudo-differential circuit by inductance L 1, and pseudo-differential circuit is provided with two outputs, and these two outputs are two outputs of MIC audio input circuit.
Again further, described pseudo-differential circuit comprises electric capacity C2, electric capacity C3, resistance R2; The input of electric capacity C2 respectively with inductance L 1, the output of resistance R2 connects, and the input of resistance R2 holds pin signal to be connected with the input of circuit C3, the BT_Module_MIC_BIAS_A of Bluetooth control module respectively.
Further, AUX audio input interface circuit comprises audio interface J1, and the B1 that the left channel audio signal of audio interface J1 is input to chip U2 by resistance R3, circuit C6 holds pin; The right channel audio signal of audio interface J1 is transferred to Bluetooth control module by resistance R4, circuit C11.
The beneficial effect that the utility model obtains is: the utility model is by arranging change-over circuit, and Bluetooth control module can carry out switching controls to MIC audio frequency, AUX audio frequency; Reduce costs.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Reference numeral is:
10---MIC audio input circuit; 20---AUX audio input interface circuit; 30---audio-source conversion selection circuit; 40---Bluetooth control module.
Embodiment
Below in conjunction with the drawings and specific embodiments, book is described further to the utility model.
Implement: 1: see Fig. 1, Fig. 2.
A kind of change-over circuit based on the input of Bluetooth audio frequency source, comprise MIC audio input circuit 10, AUX audio input interface circuit 20, audio-source conversion selection circuit 30 and Bluetooth control module 40, audio-source conversion selection circuit 30 is provided with two kinds of mode of operations, and two kinds of mode of operations are MIC pattern and AUX pattern, Bluetooth control module 40 is connected with audio conversion selection circuit signal, and control the mode of operation of audio-source conversion selection circuit 3030, when being in MIC pattern, Bluetooth control module 40 provides bias voltage to MIC audio input circuit 10, the audio signal of MIC audio input circuit 10 is delivered to Bluetooth control module 40 again by audio-source change-over circuit, Bluetooth control module 40 is provided with a control end for responding to the input of AUX audio signal, when AUX audio input interface circuit 20 has AUX audio signal to input, bluetooth module controls audio-source conversion selection circuit 30 and enters AUX pattern, AUX audio signal inputs Bluetooth control module 40 by audio-source conversion selection circuit 30.
At present, Bluetooth control module 40 only has certain control for the MIC audio frequency of input, if directly controlled AUX audio signal, the interference of two kinds of input audio signals can be caused, therefore need to carry out switching controls, the utility model devises a kind of change-over circuit, the input of audio signal is switched; Priority acccess control AUX audio signal, when not having AUX audio signal, audio-source conversion selection circuit 30 is switched to MIC pattern, controls the audio signal of MIC input.Thus realize the control of Bluetooth control module 40 to two kinds of audio input signals.Bluetooth control module 40 can adopt existing Bluetooth chip.
Particularly, audio-source conversion selection circuit 30 comprises chip U1 and chip U2, chip U1, U2 model is: 74LVC1G3157DCKRE4, chip U1 power end pin VCC is connected with power supply Vin respectively with chip U2 power end pin VCC, and chip U1 power end pin VCC and chip U2 power end pin VCC is respectively by electric capacity C9, electric capacity C10 ground connection; The S of chip U1 holds the S of pin and chip U2 to hold pin all by resistance R2 ground connection, and the S of chip U1 holds pin to hold pin to hold pin signal to be connected with the BT_Module_I/O2 of Bluetooth control module 40 with the S of chip U2; The A of chip U1 holds pin to hold pin to be connected with BT_Module_LineLN, BT_Module_LineLP signal of Bluetooth control module 40 respectively with the A of chip U2, and the B2 of chip U1 holds pin to hold pin to be connected with two outputs of MIC audio input circuit 10 respectively with the B2 of chip U2; The B1 of chip U1 holds pin by electric capacity C5 ground connection, and the B1 of chip U2 holds pin to be connected with an output end signal of AUX audio input interface circuit 20.
Further, MIC audio input circuit 10 comprises MIC, and MIC is connected with pseudo-differential circuit by inductance L 1, and pseudo-differential circuit is provided with two outputs, and these two outputs are two outputs of MIC audio input circuit 10.
MIC audio input circuit 10 forms two audio signals by pseudo-differential circuit.
Again further, described pseudo-differential circuit comprises electric capacity C2, electric capacity C3, resistance R2; The input of electric capacity C2 respectively with inductance L 1, the output of resistance R2 connects, and the input of resistance R2 holds pin signal to be connected with the input of circuit C3, the BT_Module_MIC_BIAS_A of Bluetooth control module respectively.
The BT_Module_MIC_BIAS_A of Bluetooth control module holds pin to provide bias voltage to MIC audio input circuit 10.
Further, AUX audio input interface circuit 20 comprises audio interface J1, and the B1 that the left channel audio signal of audio interface J1 is input to chip U2 by resistance R3, circuit C6 holds pin; The right channel audio signal of audio interface J1 is transferred to Bluetooth control module by resistance R4, circuit C11.
During specific works: power supply Vin powers to electronic switch U1, U2 respectively through C9, C10, wherein C9, C10 play power filter and Anti-Jamming respectively, ensure that U1, U2 power and stablize normal work, Bluetooth control module 40 is when call mode, Bluetooth control module 40BT_Module_I/O2 holds pin and BT_Module_MIC_BIAS_A to hold pin to export high potential, BT_Module_I/O2 holds foot control U1, U2 electronic switch A holds and B2 holds closed, BT_Module_MIC_BIAS_A holds pin to provide biased operating voltage to MIC circuit, MIC is receiving human voice signal through inductance L 1, wherein inductance L 1 prevents peripheral RF high-frequency signal from sealing in, again by electric capacity C2, electric capacity C3, the pseudo-differential circuit that resistance R2 forms is input to electronic switch chip U1, U2, audio signal is input to the input pin BT_Module_LineLN of Bluetooth control module 40 audio frequency again, BT_Module_LineLP, the chip DSP of Bluetooth control module 40 inside does audio frequency process, wherein electric capacity C2, electric capacity C3 is AC signal coupling, resistance R1, electric capacity C4 forms RC filter circuit to BT_Module_MIC_BIAS_A power filter, to C2, C3, the pseudo-differential circuit of R2 composition provides bias voltage, left and right acoustic channels source of sound by J1 input audio signal and BT_Module_I/O1 detects electronegative potential time, Bluetooth control module 40 is not at call mode simultaneously, Bluetooth control module 40 can open AUX function automatically, BT_Module_I/O2 exports electronegative potential control U1, U2 electronic switch A holds and B1 holds closed, R3, R4, R5, R6, composition audio signal bleeder circuit, play current limliting and pressure limiting effect, C7, C8 high-frequency signal decoupling effect, wherein left channel audio signal passes through coupling capacitance C6 again to electronic switch, arrive Bluetooth control module 40 audio input end pin BT_Module_LineLP again, R channel R4, coupling capacitance C11 is passed through again to Bluetooth control module 40 audio input end pin pin BT_Module_LineRP after R6 dividing potential drop, chip DSP does audio frequency process.
Below be only the preferred embodiment of the application, equivalent technical solutions on this basis still falls into application protection range.
Claims (5)
1. the change-over circuit based on the input of Bluetooth audio frequency source, it is characterized in that: it comprises MIC audio input circuit, AUX audio input interface circuit, audio-source conversion selection circuit and Bluetooth control module, audio-source conversion selection circuit is provided with two kinds of mode of operations, and two kinds of mode of operations are MIC pattern and AUX pattern, Bluetooth control module is connected with audio conversion selection circuit signal, and control the mode of operation of audio-source conversion selection circuit, when being in MIC pattern, Bluetooth control module provides bias voltage to MIC audio input circuit, the audio signal of MIC audio input circuit is delivered to Bluetooth control module again by audio-source change-over circuit, Bluetooth control module is provided with a control end for responding to the input of AUX audio signal, when AUX audio input interface circuit has AUX audio signal to input, bluetooth module controls audio-source conversion selection circuit and enters AUX pattern, AUX audio signal is by audio-source conversion selection circuit input Bluetooth control module.
2. a kind of change-over circuit based on the input of Bluetooth audio frequency source according to claim 1, it is characterized in that: audio-source conversion selection circuit comprises chip U1 and chip U2, chip U1 power end pin VCC is connected with power supply Vin respectively with chip U2 power end pin VCC, and chip U1 power end pin VCC and chip U2 power end pin VCC is respectively by electric capacity C9, electric capacity C10 ground connection; The S of chip U1 holds the S of pin and chip U2 to hold pin all by resistance R2 ground connection, and the S of chip U1 holds pin to hold pin to hold pin signal to be connected with the BT_Module_I/O2 of Bluetooth control module with the S of chip U2; The A of chip U1 holds pin to hold pin to be connected with BT_Module_LineLN, BT_Module_LineLP signal of Bluetooth control module respectively with the A of chip U2, and the B2 of chip U1 holds pin to hold pin to be connected with two outputs of MIC audio input circuit respectively with the B2 of chip U2; The B1 of chip U1 holds pin by electric capacity C5 ground connection, and the B1 of chip U2 holds pin to be connected with an output end signal of AUX audio input interface circuit.
3. a kind of change-over circuit based on the input of Bluetooth audio frequency source according to claim 2, it is characterized in that: MIC audio input circuit comprises MIC, MIC is connected with pseudo-differential circuit by inductance L 1, pseudo-differential circuit is provided with two outputs, and these two outputs are two outputs of MIC audio input circuit.
4. a kind of change-over circuit based on the input of Bluetooth audio frequency source according to claim 3, is characterized in that: described pseudo-differential circuit comprises electric capacity C2, electric capacity C3, resistance R2; The input of electric capacity C2 respectively with inductance L 1, the output of resistance R2 connects, and the input of resistance R2 holds pin signal to be connected with the input of circuit C3, the BT_Module_MIC_BIAS_A of Bluetooth control module respectively.
5. a kind of change-over circuit based on the input of Bluetooth audio frequency source according to claim 4, it is characterized in that: AUX audio input interface circuit comprises audio interface J1, the B1 that the left channel audio signal of audio interface J1 is input to chip U2 by resistance R3, circuit C6 holds pin; The right channel audio signal of audio interface J1 is transferred to Bluetooth control module by resistance R4, circuit C11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520525641.9U CN204810528U (en) | 2015-07-20 | 2015-07-20 | Converting circuit based on input of bluetooth audio frequency source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520525641.9U CN204810528U (en) | 2015-07-20 | 2015-07-20 | Converting circuit based on input of bluetooth audio frequency source |
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| CN204810528U true CN204810528U (en) | 2015-11-25 |
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| CN201520525641.9U Expired - Fee Related CN204810528U (en) | 2015-07-20 | 2015-07-20 | Converting circuit based on input of bluetooth audio frequency source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286424A (en) * | 2018-11-22 | 2019-01-29 | 深圳市蓝蜂时代实业有限公司 | A kind of Bluetooth adapter and implementation method of changeable input pattern |
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2015
- 2015-07-20 CN CN201520525641.9U patent/CN204810528U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286424A (en) * | 2018-11-22 | 2019-01-29 | 深圳市蓝蜂时代实业有限公司 | A kind of Bluetooth adapter and implementation method of changeable input pattern |
| CN109286424B (en) * | 2018-11-22 | 2024-02-02 | 深圳市蓝蜂时代实业有限公司 | Bluetooth adapter capable of switching input modes and implementation method |
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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: 20151125 Termination date: 20170720 |