CN204810249U - Delay circuit based on bluetooth audio frequency detects - Google Patents
Delay circuit based on bluetooth audio frequency detects Download PDFInfo
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- CN204810249U CN204810249U CN201520520466.4U CN201520520466U CN204810249U CN 204810249 U CN204810249 U CN 204810249U CN 201520520466 U CN201520520466 U CN 201520520466U CN 204810249 U CN204810249 U CN 204810249U
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Abstract
The utility model relates to a bluetooth audio frequency technical field especially relates to one (b) and plants delay circuit based on bluetooth audio frequency detects (b). It is including the audio frequency input interface, audio frequency range detection circuitry, audio frequency range control circuit, time delay trigger circuit, the bluetooth control module group that are used for receiving audio signal, when audio signal from audio frequency input interface input, after handling, simultaneous input to audio frequency range control circuit and audio frequency range detection circuitry, audio frequency range control circuit import the bluetooth control module group to audio signal, audio frequency range detection circuitry enlargies the processing to audio signal, and the audio signal after enlargeing triggers time delay trigger circuit, and the bluetooth control module group is given to time delay trigger circuit output low level, when no audio input, time delay trigger circuit output high level triggers the bluetooth control module group and closes to the bluetooth control module group. The utility model discloses a design time delay trigger circuit triggers the bluetooth control module group through time delay trigger circuit and closes with low costs and convenient to use.
Description
Technical field
The utility model relates to radio circuit technical field, specifically, relates to a kind of delay circuit detected based on Bluetooth audio frequency.
Background technology
Along with the development of electronic technology, Bluetooth audio frequency technical applications is more and more wider, wherein based on wireless headset, wireless acoustics; Bluetooth audio frequency circuit start, close time, great majority be by MCU to Bluetooth audio frequency circuit sending signal time, operate.But adopt MCU to control, make cost larger.
Summary of the invention
The purpose of this utility model is to solve the deficiencies in the prior art, and provide a kind of delay trigger circuit detected based on Bluetooth audio frequency, this delay trigger circuit can be closed automatically to Bluetooth audio frequency, reduces costs and easy to use.
For achieving the above object, the technical solution adopted in the utility model is:
Based on the delay circuit that Bluetooth audio frequency detects, comprise audio input interface, audio amplitude testing circuit, audio amplitude control circuit, delay trigger circuit, the Bluetooth control module for received audio signal; When audio signal inputs from audio input interface, be input to audio amplitude control circuit and audio amplitude testing circuit, audio amplitude control circuit is to being input to Bluetooth control module after Audio Signal Processing simultaneously; Audio amplitude testing circuit carries out amplification process to audio signal, the audio signal Time delay circuits for triggering after amplification, and delay trigger circuit output low level is to Bluetooth control module; When absence of audio inputs, delay trigger circuit exports high level to Bluetooth control module, and trigger Bluetooth controls module and closes.
Further, described delay trigger circuit comprises triode Q3, triode Q4, triode Q5 and electric capacity C7, the base stage of triode Q3 is connected with the output of audio amplitude testing circuit, the base stage of triode Q3 is connected with the negative pole of electric capacity C7, the positive pole of electric capacity C7 is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, the collector electrode of triode Q3 is connected with the base stage of triode Q4 by resistance R11, the collector electrode of triode Q4 is connected with the base stage of triode Q5 by resistance R14, the base stage of triode Q3, the base stage of triode Q4, the base stage of triode Q5 is respectively by resistance R9, resistance R12, resistance R15 ground connection, the collector electrode of triode Q3, the collector electrode of triode Q4, the collector electrode of triode Q5 is respectively by resistance R10, resistance R13, resistance R16 is connected with power supply Vin, the base stage of triode Q4 is connected with the collector electrode of triode Q4 by electric capacity C8, the collector electrode of triode Q5 is by resistance R17 ground connection, triode Q5 collector electrode is by resistance R16, R17 dividing potential drop output level is to Bluetooth control module.
Further, described audio amplitude testing circuit comprises two-stage amplifying circuit, every grade of amplifying circuit comprises a coupling capacitance and a triode, coupling capacitance is connected with the base stage of triode, the base stage of triode is connected with power supply Vin respectively by a resistance with collector electrode, the grounded emitter of triode, the collector electrode of the triode of rear class amplifying circuit is connected with delay trigger circuit signal by diode.
Further, audio amplitude control circuit comprises resistance R1, resistance R2, resistance R3, electric capacity C1 and electric capacity C2; Audio input interface is provided with two outputs, and one of them output is connected with Bluetooth control module signal by resistance R1, circuit C1 successively, and another output is connected with Bluetooth control module signal by resistance R2, circuit C3 successively; And the signal output part of the signal output part of resistance R1 and resistance R2 is respectively by resistance R3 ground connection.
The beneficial effect that the utility model obtains is: the utility model is by design delay trigger circuit, and control module by delay trigger circuit trigger Bluetooth and close, cost is low and easy to use.
Accompanying drawing explanation
Fig. 1 is operation principle schematic diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Reference numeral:
10---audio input interface; 20---audio amplitude testing circuit; 30---audio amplitude control circuit; 40---delay trigger circuit.
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 delay trigger circuit 40 detected based on Bluetooth audio frequency, comprises audio input interface 10, audio amplitude testing circuit 20, audio amplitude control circuit 30, delay trigger circuit 40, the Bluetooth control module for received audio signal; When audio signal inputs from audio input interface 10, be input to audio amplitude control circuit 30 and audio amplitude testing circuit 20 simultaneously, after audio amplitude control circuit 30 pairs of Audio Signal Processing, be input to Bluetooth control module; Audio amplitude testing circuit 20 pairs of audio signals carry out amplification process, the audio signal Time delay circuits for triggering 40 after amplification, and delay trigger circuit 40 output low level is to Bluetooth control module; When absence of audio inputs, delay trigger circuit 40 exports high level to Bluetooth control module, and trigger Bluetooth controls module and closes.
By the input state of audio signal, the level adjusting delay trigger circuit 40 pairs of Bluetooth control modules exports, thus reaches the effect of delays time to control bluetooth module closedown.
Wherein, described delay trigger circuit 40 comprises triode Q3, triode Q4, triode Q5 and electric capacity C7, the base stage of triode Q3 is connected with the output of audio amplitude testing circuit 20, the base stage of triode Q3 is connected with the negative pole of electric capacity C7, the positive pole of electric capacity C7 is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, the collector electrode of triode Q3 is connected with the base stage of triode Q4 by resistance R11, the collector electrode of triode Q4 is connected with the base stage of triode Q5 by resistance R14, the base stage of triode Q3, the base stage of triode Q4, the base stage of triode Q5 is respectively by resistance R9, resistance R12, resistance R15 ground connection, the collector electrode of triode Q3, the collector electrode of triode Q4, the collector electrode of triode Q5 is respectively by resistance R10, resistance R13, resistance R16 is connected with power supply Vin, the base stage of triode Q4 is connected with the collector electrode of triode Q4 by electric capacity C8, the collector electrode of triode Q5 is by resistance R17 ground connection, triode Q5 collector electrode is by resistance R16, R17 dividing potential drop output level is to Bluetooth control module.
This delay trigger circuit 40 operation principle is: R9, Q3, C7 in circuit form discharge circuit, R9 is Q3 base bleederresistance and C7 discharge loop resistance, C7 is electricity storage capacitor, R10 is that Q3 collector resistance is also for Q3 collector electrode is powered, C7 is charged simultaneously, R10, C7, R11, R12 are RC timing circuit, when Q3 enters into cut-off state by conducting state, namely during no audio signal input; RC timing circuit charges to C7, Q4 is made to enter conducting state when C7 cathode voltage rises to, Q5 base stage receives electronegative potential by resistance R15, make it enter and carry only state, the extremely electric level of Q5 exports high potential to Bluetooth control module I/0 mouth by resistance R16, R17 dividing potential drop, and Bluetooth control module detects that high potential performs shutdown action.
Further, described audio amplitude testing circuit 20 comprises two-stage amplifying circuit, every grade of amplifying circuit comprises a coupling capacitance and a triode, coupling capacitance is connected with the base stage of triode, the base stage of triode is connected with power supply Vin respectively by a resistance with collector electrode, the grounded emitter of triode, the collector electrode of the triode of rear class amplifying circuit is connected with delay trigger circuit 40 signal by diode.
Further, audio amplitude control circuit 30 comprises resistance R1, resistance R2, resistance R3, electric capacity C1 and electric capacity C2; Audio input interface 10 is provided with two outputs, and one of them output is connected with Bluetooth control module signal by resistance R1, circuit C1 successively, and another output is connected with Bluetooth control module signal by resistance R2, circuit C3 successively; And the signal output part of the signal output part of resistance R1 and resistance R2 is respectively by resistance R3 ground connection.
In audio amplitude control circuit 30, R1, R2, R3 form audio signal bleeder circuit, play current limliting and pressure limiting effect, be input to Bluetooth control module audio frequency input pin BT_Module_LineP and BT_Module_LineN by C1, C2 after dividing potential drop, the chip DSP of Bluetooth control module does audio frequency process
Whole circuit working principle is: whole circuit comprises power input, audio amplitude testing circuit 20, time delay timing circuits for triggering, Bluetooth control module.First, power supply Vin powers to audio amplitude testing circuit 20 and delay trigger circuit 40 through electric capacity C9, C10, and wherein C9, C10 play power filter and Anti-Jamming respectively, ensures that power good normally works.J1 inputs left and right audio signal, be input to audio amplitude control circuit 30 and audio amplitude testing circuit 20 by L1, L2 simultaneously, wherein L1, L2 play high-frequency signal decoupling and anti-High-frequency Interference effect, in audio amplitude control circuit 30, R1, R2, R3 form audio signal bleeder circuit, play current limliting and pressure limiting effect, Bluetooth control module audio frequency input pin BT_Module_LineP and BT_Module_LineN is input to by C1, C2 after dividing potential drop, chip DSP does audio frequency process, C1, C2 are audio signal input coupling capacitance, play isolated DC effect simultaneously.C3 in audio amplitude testing circuit 20, C4 merges output to left and right audio signal, C3, C4, C5 audio signal input coupling capacitance, play isolated DC effect, resistance R4 is limited ductility limit piezoresistance, Q1 simultaneously, Q2, R5, R6, R7, R8, C6 forms two-stage audio amplifier circuit, wherein Q1, Q2 is NPN transistor, electrification stream amplification, R5 is Q1 base biasing resistor, rise and provide base current to Q1, make it be operated in amplification, R6 is Q1 collector resistance, for Q1 collector electrode is powered, C6 is that audio signal exports input coupling capacitance, and play isolated DC effect, R7 is Q2 base biasing resistor simultaneously, rise and provide base current to Q2, make it be operated in amplification, R8 is Q2 collector resistance, for Q2 collector electrode is powered, become voltage to export the current conversion of amplification simultaneously, exporting direct current through diode D1 rectification again makes it enter conducting state to time delay timing circuits for triggering Q3 ground level, discharges to electric capacity C7, wherein R9, Q3, C7 forms discharge circuit, and R9 is Q3 base bleederresistance and C7 discharge loop resistance, and C7 is electricity storage capacitor, and R109 is Q3 collector resistance, for Q3 collector electrode is powered, simultaneously to C7 charging, and R10, C7, R11, R12 is RC timing circuit, and when Q3 enters into cut-off state by conducting state, RC timing circuit charges to C7, Q4 is made to enter conducting state when C7 cathode voltage rises to, Q5 base stage receives electronegative potential by resistance R15, and make it enter and carry only state, the extremely electric level of Q5 is by resistance R16, R17 dividing potential drop exports high potential to Bluetooth control module I/0 mouth, and Bluetooth control module detects that high potential performs shutdown action.Bluetooth control module can adopt the Bluetooth chip of prior art to control.
Below be only the preferred embodiment of the application, equivalent technical solutions on this basis still falls into application protection range.
Claims (4)
1., based on the delay circuit that Bluetooth audio frequency detects, it is characterized in that: comprise audio input interface, audio amplitude testing circuit, audio amplitude control circuit, delay trigger circuit, the Bluetooth control module for received audio signal; When audio signal inputs from audio input interface, be input to audio amplitude control circuit and audio amplitude testing circuit, audio amplitude control circuit is to being input to Bluetooth control module after Audio Signal Processing simultaneously; Audio amplitude testing circuit carries out amplification process to audio signal, the audio signal Time delay circuits for triggering after amplification, and delay trigger circuit output low level is to Bluetooth control module; When absence of audio inputs, delay trigger circuit exports high level to Bluetooth control module, and trigger Bluetooth controls module and closes.
2. a kind of delay circuit detected based on Bluetooth audio frequency according to claim 1, it is characterized in that: described delay trigger circuit comprises triode Q3, triode Q4, triode Q5 and electric capacity C7, the base stage of triode Q3 is connected with the output of audio amplitude testing circuit, the base stage of triode Q3 is connected with the negative pole of electric capacity C7, the positive pole of electric capacity C7 is connected with the collector electrode of triode Q3, the grounded emitter of triode Q3, the collector electrode of triode Q3 is connected with the base stage of triode Q4 by resistance R11, the collector electrode of triode Q4 is connected with the base stage of triode Q5 by resistance R14, the base stage of triode Q3, the base stage of triode Q4, the base stage of triode Q5 is respectively by resistance R9, resistance R12, resistance R15 ground connection, the collector electrode of triode Q3, the collector electrode of triode Q4, the collector electrode of triode Q5 is respectively by resistance R10, resistance R13, resistance R16 is connected with power supply Vin, the base stage of triode Q4 is connected with the collector electrode of triode Q4 by electric capacity C8, the collector electrode of triode Q5 is by resistance R17 ground connection, triode Q5 collector electrode is by resistance R16, R17 dividing potential drop output level is to Bluetooth control module.
3. a kind of delay circuit detected based on Bluetooth audio frequency according to claim 2, it is characterized in that: described audio amplitude testing circuit comprises two-stage amplifying circuit, every grade of amplifying circuit comprises a coupling capacitance and a triode, coupling capacitance is connected with the base stage of triode, the base stage of triode is connected with power supply Vin respectively by a resistance with collector electrode, the grounded emitter of triode, the collector electrode of the triode of rear class amplifying circuit is connected with delay trigger circuit signal by diode.
4. a kind of delay circuit detected based on Bluetooth audio frequency according to claim 3, is characterized in that: audio amplitude control circuit comprises resistance R1, resistance R2, resistance R3, electric capacity C1 and electric capacity C2; Audio input interface is provided with two outputs, and one of them output is connected with Bluetooth control module signal by resistance R1, circuit C1 successively, and another output is connected with Bluetooth control module signal by resistance R2, circuit C3 successively; And the signal output part of the signal output part of resistance R1 and resistance R2 is respectively by resistance R3 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520520466.4U CN204810249U (en) | 2015-07-17 | 2015-07-17 | Delay circuit based on bluetooth audio frequency detects |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520520466.4U CN204810249U (en) | 2015-07-17 | 2015-07-17 | Delay circuit based on bluetooth audio frequency detects |
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| CN204810249U true CN204810249U (en) | 2015-11-25 |
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| CN201520520466.4U Expired - Fee Related CN204810249U (en) | 2015-07-17 | 2015-07-17 | Delay circuit based on bluetooth audio frequency detects |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504756A (en) * | 2021-07-23 | 2021-10-15 | 巨翊科技（上海）有限公司 | Time delay method and system based on voice circuit, circuit protection method and device |
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2015
- 2015-07-17 CN CN201520520466.4U patent/CN204810249U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504756A (en) * | 2021-07-23 | 2021-10-15 | 巨翊科技（上海）有限公司 | Time delay method and system based on voice circuit, circuit protection method and device |
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| 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: 20151125 Termination date: 20170717 |