CN110049405A - A kind of Campatible car microphone circuit - Google Patents
A kind of Campatible car microphone circuit Download PDFInfo
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- CN110049405A CN110049405A CN201810035537.XA CN201810035537A CN110049405A CN 110049405 A CN110049405 A CN 110049405A CN 201810035537 A CN201810035537 A CN 201810035537A CN 110049405 A CN110049405 A CN 110049405A
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 62
- 230000005236 sound signal Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 8
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001394 sodium malate Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
A kind of Campatible car microphone circuit, including socket, detection circuit, the first input matching circuit, the second input matching circuit, the first switching circuit, the second switching circuit and CPU；The detection circuit input terminal is connected with test socket state with socket；First switching circuit is connected to control the matching for opening or closing input circuit with the second switching circuit；Second switching circuit is connected to control the first input matching circuit of access or the second input matching circuit with the first input matching circuit and the second input matching circuit；The CPU is connected to control whether acquisition socket voltage value according to outlet status with detection circuit output end, the first switching circuit, the second switching circuit and socket, and voltage value is compared to the matching for judging microphone type and controlling the first switching circuit and the second switching circuit movement realization input circuit with the threshold value prestored.The present invention is able to achieve dynamic microphones and the compatibility of Electret Condencer Microphone uses, and circuit is simple, low in cost.
Description
Technical field
The present invention relates to microphone circuit field, especially a kind of Campatible car microphone circuit.
Background technique
For vehicle-mounted multimedia terminal equipment in the utilization on car, especially tourist bus vehicle generally can all require more matchmakers
Body terminal device needs the function of propagandaing directed to communicate of microphone, the diversification with people to amusement function, some clients need to be equipped with
Moving-coil type wire microphone, some customer requirements are equipped with condenser type wire microphone, and the principle of two kinds of microphones is different, makes
Obtain the compatibility issue that circuit needs to consider in the design process two kinds of microphone input circuits.
Dynamic microphones are to be turned voice signal in magnetic field intercepts magnetic induction line by coil using electromagnetic induction principle
It is changed to electric signal.And capacitance microphone, also referred to as electret microphone, its core component are a grade heads, by two panels metal
Film composition；When sound wave causes its vibration, the difference of metallic film spacing causes the difference of capacitor, to generate electricity
Stream is the variation using capacitance size, converts electric signal for voice signal, it is necessary to and there is independent power supply power supply to be driven,
It could use, generally 1.5V, if both microphone inputs, in the same interface, and input circuit is not set as compatibility
Meter, then will bring inconvenience in actual use, or cause to have a kind of microphone can not normal use the problem of.
In addition when actually using both microphones, can usually encounter had when opening microphone moment " flutterring " one
Sound often brings a kind of ear-piercing sound to passenger as without processing for this switching noise.It is asked for these
Topic just needs a kind of circuit and method for being compatible with vehicle-mounted dynamic microphones and Electret Condencer Microphone, to solve both microphones
Compatibility issue in actual use, and optimization noise problem.
Summary of the invention
It is a primary object of the present invention to overcome drawbacks described above in the prior art, propose it is a kind of it is at low cost, using convenient
Campatible car microphone circuit.
The present invention adopts the following technical scheme:
A kind of Campatible car microphone circuit, including socket, it is characterised in that: further include detection circuit, the first input
Match circuit, the second input matching circuit, the first switching circuit, the second switching circuit and CPU；The detection circuit input terminal and insert
Seat is connected with test socket state；First switching circuit is connected to control and open or close input circuit with the second switching circuit
Matching；Second switching circuit is connected to control the first input of access with the first input matching circuit and the second input matching circuit
Match circuit or the second input matching circuit；The CPU and detection circuit output end, the first switching circuit, the second switching circuit and
Socket is connected to control whether acquisition socket voltage value according to outlet status, and voltage value is compared with the threshold value prestored and is sentenced
Disconnected microphone type and the matching for controlling the first switching circuit and the second switching circuit movement realization input circuit.
It preferably, further include having filter capacitor C7, the one end filter capacitor C7 is connected with first switching circuit, another
End ground connection.
Preferably, the detection circuit includes voltage comparator U2, the audio signal input end of anode and the socket
It is connected, negative terminal connects reference voltage VREF, and output end is connected with the input terminal of the CPU.
Preferably, first input matching circuit includes resistance R3, build-out resistor Rd and capacitor C3；The one end resistance R3
It is connected with first switching circuit, the other end is connected with second switching circuit and the socket；Build-out resistor Rd mono-
End is connected with the second switching circuit, other end ground connection；Capacitor C3 and build-out resistor Rd and company.
Preferably, second input matching circuit include resistance R4, resistance R5, build-out resistor Rc, filter capacitor C4 and
Voltage-stabiliser tube D1；The one end resistance R4 is connected with second switching circuit, and the other end is connected with the one end resistance R5, and resistance R5 is another
One end is connected with first switching circuit and the socket；The voltage-stabiliser tube anode is connected with the one end resistance R5, negativing ending grounding；It should
The one end build-out resistor Rc is connected with the second switching circuit, other end ground connection；Capacitor C4 and build-out resistor Rc and company.
Preferably, second switching circuit includes relay K1 and relay K3；The movable contact of relay K1 and institute
It states the first switching circuit to be connected, normally-closed contact is connected with first switching circuit, normally opened contact and second switching circuit
It is connected；The movable contact of relay K3 connects VCC, and normally-closed contact is connected with first switching circuit, normally opened contact with it is described
Second switching circuit is connected；The control terminal of relay K1 and relay K3 are connected with the CPU.
Preferably, first switching circuit includes relay K2, movable contact and first input matching circuit, the
Two input matching circuits are connected with the socket, and normally-closed contact is connected with the capacitor C7, normally opened contact and described second
Switching circuit is connected, and control terminal is connected with the CPU.
It preferably, further include having capacitor C5 and capacitor C6, the one end capacitor C5 is connected with the ground terminal of the socket, another
End is connected with the audio signal input end of the socket；Capacitor C6 and capacitor C5 and company.
It preferably, further include resistance R1, resistance R2, capacitor C1 and capacitor C2；The one end resistance R1 ground connection, the other end and electricity
Hold the one end C1 to be connected；The one end resistance R2 is connected with the audio signal input end of the socket, the other end and the one end capacitor C2 phase
Even.
It preferably, further include audio amplifier amplifying circuit U3, voice-grade channel selectivity device U4 and the vehicle being connected with the CPU
Carry power amplifier U5；The audio amplifier amplifying circuit U3 input terminal is connected with the other end of the capacitor C1 and the capacitor C2, output
End is connected with the input terminal of voice-grade channel selector U4, the input of the output end and vehicle-mounted power amplifier U5 of voice-grade channel selector U4
End is connected.
By the above-mentioned description of this invention it is found that compared with prior art, the invention has the following beneficial effects:
1, the present invention output impedance characteristic different using dynamic microphones and Electret Condencer Microphone, using detection electricity
Road carries out microphone insertion detection, judges moving-coil type or capacitive microphone with the A/D acquisition of CPU, finally leads to
Cross I O mouthfuls of the first switching circuits of control and the second switching circuit carry out the input circuit matching of moving-coil type and Electret Condencer Microphone,
The compatibility use of dynamic microphones and Electret Condencer Microphone is realized with this, circuit is simple, low in cost.
2, circuit of the present invention optimizes microphone using filter capacitor C7 and opens " flutterring " that moment is generated due to level mutation
Noise has the advantages that reduce switching noise.
3, the present invention is able to achieve the same input interface to the compatibility of dynamic microphones and Electret Condencer Microphone, can apply
In the multimedia terminal equipment with wire microphone functional requirement, for meeting client to dynamic microphones and condenser type
The individualized selection of microphone.
4, the present invention is equipped with the first input matching circuit and the second input matching circuit, realizes input to different microphones
The matching (inputting 5-10 times that build-out resistor takes microphone internal resistance) of impedance, guarantees that input has enough voltage transmission coefficients,
The frequency response of whole system is not influenced again.
Detailed description of the invention
Fig. 1 is circuit diagram of the present invention；
Fig. 2 is flow chart of the present invention.
Specific embodiment
Below by way of specific embodiment, the invention will be further described.
Referring to Fig.1, a kind of Campatible car microphone circuit, including socket J1, detection circuit, the first input matching electricity
Road, the second input matching circuit, the first switching circuit, the second switching circuit, CPU U1 and filter capacitor C7 etc..Socket J1 can
Using 3 foot microphone jacks (such as 6.35 audio sockets), when microphone plug is inserted into but microphone switch is not turned on, root
According to the elastic slice inside the connection type and socket of circuit, so that 1,2,3 feet are all shorted to ground, only when microphone switch is beaten
When opening, 3 feet of socket J1 just have audio signal and are input to late-class circuit, i.e. 3 feet are audio signal input end.
Further include having capacitor C5 and capacitor C6, be high frequency capacitance, for filtering out radio noise (sound caused by GSM is interfered
Frequency noise).One end of capacitor C5 and capacitor C6 are connected with the ground terminal of socket J1, the audio signal of the other end and socket J1
Input terminal is connected.
Further include resistance R1, resistance R2, capacitor C1 and capacitor C2, constitutes input circuit.The one end resistance R1 ground connection, separately
One end is connected with the one end capacitor C1, the one end resistance R2 and the audio signal input end of socket J1, pair of capacitor C5 and capacitor C6
It should hold connected, the other end is connected with the one end capacitor C2.
Further, further include audio amplifier amplifying circuit U3, the voice-grade channel selectivity device U4 being connected with CPU U1 and
Vehicle-mounted power amplifier U5 etc..The audio amplifier amplifying circuit U3 input terminal is connected with the other end of capacitor C1 and capacitor C2, output end with
The input terminal of voice-grade channel selector U4 is connected, the input terminal phase of the output end and vehicle-mounted power amplifier U5 of voice-grade channel selector U4
Even.
Voltage comparator U2 can be used in detection circuit, and the anode of voltage comparator U2 and the audio signal of socket J1 input
End is connected, and negative terminal connects reference voltage VREF, and output end is connected with the input terminal GPIO0 of CPU U1.When socket J1 is not inserted into
When microphone, voltage comparator U2 exports the input terminal GPIO0 of low level to CPU U1, when socket J1 is inserted into microphone
(dynamic microphones or Electret Condencer Microphone), voltage comparator U2 export the input terminal GPIO0 of high level to CPU U1.It should
First switching circuit includes relay K2, for controlling the matching for opening or closing input circuit.Second switching circuit includes
Relay K1 and relay K3, for controlling the first input matching circuit of access or the second input matching circuit.The relay can
Using the relay of single-pole double throw, it is equipped with movable contact, normally-closed contact, normally opened contact and control terminal.Relay K1's is normally closed
Contact is connected with the one end capacitor C7, capacitor C7 other end ground connection.Capacitor C7 is filter capacitor, is opened for eliminating microphone
The audio-frequency noise of moment.The normally opened contact of relay K2 is connected with the movable contact A1 of relay K1, the dynamic touching of relay K3
Point connection VCC.
First input matching circuit includes resistance R3, build-out resistor Rd and capacitor C3 etc..The one end resistance R3 and relay
The normally-closed contact B3 of K3 is connected, and the other end is connected with the audio signal input end of the movable contact A of relay K2, socket J1.This
It is connected with the one end resistance Rd with the normally-closed contact B1 of relay K1, other end ground connection, build-out resistor Rd is dynamic microphones
Input build-out resistor.Capacitor C3 and build-out resistor Rd and company.
Second input matching circuit includes resistance R4, resistance R5, build-out resistor Rc, filter capacitor C4 and voltage-stabiliser tube D1 etc..
The one end resistance R4 is connected with the normally opened contact C3 of relay K3, and the other end is connected with the one end resistance R5, the resistance R5 other end
It is connected with the audio signal input end of the movable contact A of relay K2, socket J1.The voltage-stabiliser tube anode and resistance R4 and resistance R5
Connected end connection, negativing ending grounding.The one end build-out resistor Rc is connected with the normally opened contact C1 of relay K1, other end ground connection, should
Capacitor C4 and build-out resistor Rc and company, resistance Rc are the input build-out resistor of Electret Condencer Microphone.Capacitor C4 is with capacitor C3
Filter capacitor can reduce the self-excitation sound of corresponding microphone (Electret Condencer Microphone, dynamic microphones) respectively.Voltage-stabiliser tube D1,
Pressure stabilizing is provided for Electret Condencer Microphone (Electret Condencer Microphone requires certain external power supply voltage that could work normally) power supply to protect
Card adjusts resistance R4, the relevant parameter of resistance R5 and voltage-stabiliser tube D1 according to different Electret Condencer Microphones is selected.Resistance R3,
R4, R5 are current-limiting resistance.
The CPU U1 is core cpu mini system, includes MCU, DDR3, EMMC, audio/video decoding module etc..It exports control
The control terminal S1 of mouthful GPIO1 connection relay K1, export control mouth GPIO2 connection relay K2 control terminal S2, A D acquire
Mouth is connected with resistance R6 and the one end resistance R7, exports the control terminal S3 of control mouth GPIO3 connection relay K3.Resistance R6 is another
End connection voltage comparator U2 anode, relay K2 movable contact A2 and socket J1 audio signal input end, resistance R7 is another
One end ground connection, resistance R6 and resistance R7 are limited flow point piezoresistance so that the A of CPU U1 D acquisition port voltage do not exceed I O mouthfuls
The ceiling voltage of itself.
The level signal that the CPU U1 can be received according to GPIO0, control A D acquisition port whether acquire the audio of socket J1
The voltage value of signal input part, and collected voltage value is compared with the threshold value prestored and judges microphone type and controls
The matching of relay K1, relay K2, relay K3 movement realization input circuit.
The output impedance (internal resistance) of dynamic microphones of the present invention is rd, and the output impedance (internal resistance) of Electret Condencer Microphone is
rc.In practice, rd will not be equal to rc, and the output impedance of common dynamic microphones is generally in 500 ohms (as obtained
Win dynamic microphones E350), (such as win victory general 350 ohms of Electret Condencer Microphone output impedance Electret Condencer Microphone PC-
K120).Build-out resistor Rd is usually 5-10 times of rd in practice, and build-out resistor Rc is usually 5-10 times of rc, so
It can guarantee enough voltage transmission coefficients, and do not influence the frequency response of whole system.The condition that reference voltage VREF meets is 0
<VREF<VCC*rd/(R3+rd)；Meet 0 < VREF < VCC*rc/ (R3+rc) simultaneously, the electricity of voltage comparator U2 anode (P point)
Pressure is indicated with VP.
Referring to Fig. 2, concrete principle of the invention is as follows:
When the microphone (either moving-coil type or condenser type) of insertion is not switched on, the foot of inside three of socket J1 is all
Be shorted to ground, under default conditions the output control I of CPU U1 O mouthfuls of GPIO1, GPIO2, GPIO3 be all for low level state, this
When, voltage comparator U2 exports low level and detects that GPIO0 is low level to GPIO0, U1, indicate the opening of not microphone,
A acquisition of the D without voltage value, the I of U1 O mouthfuls of GPIO1, GPIO2, GPIO3 remain low level state, relay K1, K2
It is connect with the movable contact of K3 with normally-closed contact, is the default conditions of equipment.
When the microphone of insertion is opened, P point voltage VP=VCC*rd/ (R3+rd) or VP=VCC*rc/ (R3+rc) lead to
Over-voltage comparator U2 comparison output high level detects that GPIO0 is high level to GPIO0, U1, indicates the opening of microphone,
The A of CPU U1 D mouthfuls of collected voltage values be Vx (Vx=VP*R7/ (R6+R7)), it is pre- with being saved in advance in CPU U1 memory
Deposit value (with V1 indicate open dynamic microphones acquisition key assignments, V2 indicate open Electret Condencer Microphone acquisition key assignments, due to
The reason of error, V1, V2 set certain error range) comparison judgement:
If Vx is in the error range of V1, then it represents that opening is dynamic microphones, and it is low that CPU U1, which controls GPIO1,
Level, GPIO2 are high level, GPIO3 is low level, and relay K1, K2 keep default conditions, and the movable contact A2 of relay K2 connects
Logical normally opened contact C2.At this time current-limiting resistance R3, input build-out resistor Rd and filter capacitor C3 by relay K3, relay K2,
Relay K1 is connected in input circuit, realizes the matching of dynamic microphones input circuit, opens moment for microphone
" flutterring " sound is filtered out and (is filtered out before the movable contact A2 of relay K2 is switched to and connects normally-closed contact C2) by C7.
If Vx is in the error range of V2, then it represents that opening is that then CPU U1 control GPIO1 is Electret Condencer Microphone
High level, GPIO2 are high level, GPIO3 is high level, and the movable contact A2 of relay K2 connects normally opened contact C2, relay at this time
The movable contact A1 of device K1 connects normally opened contact C1, and the movable contact A3 of relay K3 connects normally opened contact C3, current-limiting resistance R4, pressure stabilizing
Pipe D1, current-limiting resistance R5, input build-out resistor Rc and capacitor C4 are connected in input circuit by relay K3, K2, K1, are realized
" flutterring " sound of moment is opened microphone in the matching of Electret Condencer Microphone input circuit, is filtered out by C7 (in the movable contact of K2
A2 is filtered out before being switched to normally-closed contact C2).
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, all to utilize this
Design makes a non-material change to the present invention, and should all belong to behavior that violates the scope of protection of the present invention.
Claims (10)
1. a kind of Campatible car microphone circuit, including socket, it is characterised in that: further include detection circuit, the first input
With circuit, the second input matching circuit, the first switching circuit, the second switching circuit and CPU；The detection circuit input terminal and socket
It is connected with test socket state；First switching circuit is connected to control and open or close input circuit with the second switching circuit
Matching；Second switching circuit is connected to control the first input of access with the first input matching circuit and the second input matching circuit
With circuit or the second input matching circuit；It the CPU and detection circuit output end, the first switching circuit, the second switching circuit and inserts
Seat is connected to control whether acquisition socket voltage value according to outlet status, and voltage value is compared judgement with the threshold value prestored
Microphone type and the matching for controlling the first switching circuit and the second switching circuit movement realization input circuit.
2. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: further include having filter capacitor
C7, the one end filter capacitor C7 are connected with first switching circuit, other end ground connection.
3. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: the detection circuit includes electricity
Comparator U2 is pressed, anode is connected with the audio signal input end of the socket, and negative terminal connects reference voltage VREF, output end
It is connected with the input terminal of the CPU.
4. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: the first input matching electricity
Road includes resistance R3, build-out resistor Rd and capacitor C3；The one end resistance R3 is connected with first switching circuit, the other end and institute
The second switching circuit is stated to be connected with the socket；The one end build-out resistor Rd is connected with the second switching circuit, other end ground connection；It should
Capacitor C3 and build-out resistor Rd and company.
5. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: the second input matching electricity
Road includes resistance R4, resistance R5, build-out resistor Rc, filter capacitor C4 and voltage-stabiliser tube D1；It is cut with described second the one end resistance R4
It changes circuit to be connected, the other end is connected with the one end resistance R5, the resistance R5 other end and first switching circuit and the socket
It is connected；The voltage-stabiliser tube anode is connected with the one end resistance R5, negativing ending grounding；The one end build-out resistor Rc and the second switching circuit phase
Even, other end ground connection；Capacitor C4 and build-out resistor Rc and company.
6. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: the second switching circuit packet
Include relay K1 and relay K3；The movable contact of relay K1 is connected with first switching circuit, normally-closed contact with it is described
First switching circuit is connected, and normally opened contact is connected with second switching circuit；The movable contact of relay K3 connects VCC, often
Closed contact is connected with first switching circuit, and normally opened contact is connected with second switching circuit；Relay K1 and relay
The control terminal of device K3 is connected with the CPU.
7. a kind of Campatible car microphone circuit as claimed in claim 2, it is characterised in that: the first switching circuit packet
Relay K2 is included, movable contact is connected with first input matching circuit, the second input matching circuit and the socket, often
Closed contact is connected with the capacitor C7, and normally opened contact is connected with second switching circuit, control terminal and the CPU phase
Even.
8. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: further include having capacitor C5 and electricity
Hold C6, the one end capacitor C5 is connected with the ground terminal of the socket, and the other end is connected with the audio signal input end of the socket；
Capacitor C6 and capacitor C5 and company.
9. a kind of Campatible car microphone circuit as described in claim 1, it is characterised in that: further include resistance R1, resistance
R2, capacitor C1 and capacitor C2；The one end resistance R1 ground connection, the other end are connected with the one end capacitor C1；The one end resistance R2 with it is described
The audio signal input end of socket is connected, and the other end is connected with the one end capacitor C2.
10. a kind of Campatible car microphone circuit as claimed in claim 9, it is characterised in that: further include and the CPU phase
Audio amplifier amplifying circuit U3, voice-grade channel selectivity device U4 and vehicle-mounted power amplifier U5 even；Audio amplifier amplifying circuit U3 is defeated
Enter end to be connected with the other end of the capacitor C1 and the capacitor C2, the input terminal phase of output end and voice-grade channel selector U4
Even, the output end of voice-grade channel selector U4 is connected with the input terminal of vehicle-mounted power amplifier U5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810035537.XA CN110049405B (en) | 2018-01-15 | 2018-01-15 | Compatible vehicle-mounted microphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810035537.XA CN110049405B (en) | 2018-01-15 | 2018-01-15 | Compatible vehicle-mounted microphone circuit |
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|---|---|
| CN110049405A true CN110049405A (en) | 2019-07-23 |
| CN110049405B CN110049405B (en) | 2022-02-18 |
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|---|---|---|---|
| CN201810035537.XA Active CN110049405B (en) | 2018-01-15 | 2018-01-15 | Compatible vehicle-mounted microphone circuit |
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| CN104754484A (en) * | 2013-12-27 | 2015-07-01 | Gn瑞声达A/S | Hearing instrument with switchable power supply voltage |
| CN103929696A (en) * | 2014-03-17 | 2014-07-16 | 联想(北京)有限公司 | Earphone detection processing method, device and mobile terminal |
| CN104602164A (en) * | 2015-01-15 | 2015-05-06 | 广东小天才科技有限公司 | Earphone self-adaptation circuit and electronic equipment |
| CN105050001A (en) * | 2015-08-06 | 2015-11-11 | 宁波萨瑞通讯有限公司 | Headset compatible circuit and working method thereof |
| CN107205206A (en) * | 2016-03-17 | 2017-09-26 | 北京卓锐微技术有限公司 | Microphone test device, system and method for testing |
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