CN207369275U - A kind of circuit structure of sound pick-up - Google Patents
A kind of circuit structure of sound pick-up Download PDFInfo
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- CN207369275U CN207369275U CN201721223486.0U CN201721223486U CN207369275U CN 207369275 U CN207369275 U CN 207369275U CN 201721223486 U CN201721223486 U CN 201721223486U CN 207369275 U CN207369275 U CN 207369275U
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Abstract
The utility model discloses a kind of circuit structure of sound pick-up, it includes microphone, filter amplification circuit, differential-to-single-ended circuit, adder circuit, inverter circuit, the first differential signal outputs mouth, the second differential signal outputs mouth, the first differential signal input mouth, the second differential signal input mouth and bias voltage circuit；Microphone is connected with the input terminal of filter amplification circuit, and the output terminal of filter amplification circuit is connected with the first input end of adder circuit；First differential signal input mouth and the second differential signal input mouth are connected with two input terminals of differential-to-single-ended circuit respectively, the output terminal of differential-to-single-ended circuit is connected with the second input terminal of adder circuit, and the output terminal of adder circuit is connected with the first differential signal outputs mouth；The output terminal of adder is also connected with the input terminal of inverter circuit, and the output terminal of inverter circuit is connected with the second differential signal outputs mouth.The utility model possesses long distance transmission ability and has cascade function.
Description
Technical field
Sound pick-up field is the utility model is related to, particularly relates to a kind of pickup cascaded and possess long distance transmission ability
The circuit structure of device.
Background technology
The main function of sound pick-up is to be picked up the voice signal at county town using microphone and be converted to electric signal, warp
Exported after crossing amplifying circuit；In order to ensure the pickup effect of sound pick-up, usually using tone frequency channel wire by sound pick-up expand come so that
Sound pick-up can arrange that in place the audio signal of sound pick-up output is then linked into big part host by tone frequency channel wire, because
This sound pick-up is independent with respect to host.
But the sound pick-up of existing expansion is only applicable to the usage scenario compared with short audio line, if using longer audio
Line（For example 10 meters）When carrying out the audio signal transmission of long range, the signal-to-noise ratio of the audio signal of transmission will be seriously affected, therefore
Existing sound pick-up does not possess the ability of long distance transmission generally.
Utility model content
The purpose of this utility model is to provide a kind of circuit for the sound pick-up for cascading and possessing long distance transmission ability
Structure.
In order to achieve the above objectives, the solution of the utility model is：
A kind of circuit structure of sound pick-up, it includes microphone, filter amplification circuit, differential-to-single-ended circuit, adder
Circuit, inverter circuit, the first differential signal outputs mouth, the second differential signal outputs mouth, the first differential signal input
Mouthful, the second differential signal input mouth and be microphone, filter amplification circuit, differential-to-single-ended circuit, adder circuit, anti-
Phase device circuit provides the bias voltage circuit of bias voltage；The microphone is connected with the input terminal of the filter amplification circuit,
The output terminal of the filter amplification circuit is connected with the first input end of the adder circuit；The first differential signal input
Port and the second differential signal input mouth are connected with two input terminals of the differential-to-single-ended circuit respectively, the difference
Turn the output terminal of single-end circuit with the second input terminal of the adder circuit to be connected, the output terminal of the adder circuit and institute
The first differential signal outputs mouth is stated to be connected；Input terminal phase of the output terminal of the adder circuit also with the inverter circuit
Even, the output terminal of the inverter circuit is connected with the second differential signal outputs mouth.
The bias voltage circuit includes power end VCC, resistance R16, resistance R19, capacitance C17, operational amplifier U3；Institute
State one end of power end VCC connecting resistances R16, the in-phase input end of the other end concatenation operation amplifier U3 of the resistance R16, institute
The other end for stating resistance R16 is also connected with the other end ground connection of one end of resistance R19 and capacitance C17, resistance R19 and capacitance C17, fortune
The inverting input for calculating amplifier U3 is connected with the output terminal of operational amplifier U3, and the output terminal of operational amplifier U3 is biased electrical
The output terminal of volt circuit.
The filter amplification circuit includes MFB circuit of high pass filter and MFB low-pass filter circuits, the MFB high passes
The input terminal of filter circuit is the input terminal of the filter amplification circuit, and the output terminal of the MFB low-pass filter circuits is
The output terminal of the filter amplification circuit, the output terminal of the MFB circuit of high pass filter and the MFB low-pass filter circuits
Input terminal be connected.
The MFB circuit of high pass filter includes capacitance C1, capacitance C2, capacitance C4, capacitance C7, resistance R1, resistance R6, electricity
Hinder R8, operational amplifier U1；One end of capacitance C2 is the input terminal of MFB circuit of high pass filter, one end of resistance R6 be used for
The output terminal of bias voltage circuit is connected, and the output terminal of operational amplifier U1 is the output terminal of MFB circuit of high pass filter；Capacitance
The other end of C2 is connected with one end of capacitance C1 and capacitance C4, and the one end of one end of capacitance C4 also with resistance R8 is connected, resistance R8
The other end ground connection；The other end of capacitance C1 is connected with one end of resistance R1, the other end of resistance R1 and the other end of capacitance C4
It is connected, the inverting input of the other end of capacitance C4 also with operational amplifier U1 is connected；The other end and operation amplifier of resistance R6
The in-phase input end of device U1 is connected, and the one end of the other end of resistance R6 also with capacitance C7 is connected, the other end ground connection of capacitance C7.
The MFB low-pass filter circuits include capacitance C3, capacitance C5, capacitance C8, resistance R3, resistance R4, resistance R5, electricity
Hinder R7, operational amplifier U2；One end of capacitance C5 is the input terminal of MFB low-pass filter circuits, one end of resistance R7 be used for
The output terminal of bias voltage circuit is connected, and the output terminal of operational amplifier U2 is the output terminal of MFB low-pass filter circuits；Capacitance
The other end of C5 is connected with one end of resistance R4, and the other end of resistance R4 is connected with one end of capacitance C6, resistance R3, resistance R5,
The other end ground connection of capacitance C6, the other end of resistance R3 are connected with one end of capacitance C3, and the other end of capacitance C3 is with resistance R5's
The other end is connected, and the inverting input of the other end of resistance R5 also with operational amplifier U2 is connected；The other end and fortune of resistance R7
The in-phase input end for calculating amplifier U1 is connected, and the one end of the other end of resistance R7 also with capacitance C8 is connected, the other end of capacitance C8
Ground connection.
The differential-to-single-ended circuit includes resistance R12, resistance R17, resistance R20, resistance R23, capacitance C16, capacitance
C18, capacitance C12, capacitance C22, operational amplifier U4；One end of capacitance C16 is the first input end of differential-to-single-ended circuit, electric
The one end for holding C17 is the second input terminal of differential-to-single-ended circuit, and one end of resistance R23 is used for the output with bias voltage circuit
End is connected, and the output terminal of operational amplifier U4 is the output terminal of differential-to-single-ended circuit；The other end of capacitance C16 and resistance R17
One end is connected, and the other end of resistance R17 is connected with the inverting input of operational amplifier U4, the anti-phase input of operational amplifier U4
One end also with resistance R12 and capacitance C12 is held to be connected, the other end of resistance R12 and capacitance C12 and the output of operational amplifier U4
End is connected, and the other end of capacitance C18 is connected with one end of resistance R20, the other end of resistance R20 and the same phase of operational amplifier U4
Input terminal is connected, and one end of resistance R23 is connected with one end of capacitance C22, the in-phase input end of operational amplifier U4 also with resistance
R23 is connected with the other end of capacitance C22.
The adder circuit includes capacitance C9, capacitance C11, capacitance C13, resistance R9, resistance R10, resistance R13, resistance
R15, operational amplifier U5；One end of capacitance C9 is the first input end of adder circuit, and one end of capacitance C11 is adder electricity
Second input terminal on road, one end of resistance R13 are used to be connected with the output terminal of bias voltage circuit, the output of operational amplifier U5
Hold the output terminal for adder circuit；The other end of capacitance C9 is connected with resistance R10 one end, the other end of resistance R10 and computing
The inverting input of amplifier U5 is connected；The other end of capacitance C11 is connected with resistance R15 one end, the other end and fortune of resistance R15
The inverting input for calculating amplifier U5 is connected;One end of resistance R9 is connected with the inverting input of operational amplifier U5, resistance R9
The other end be connected with the output terminal of operational amplifier U5；The other end of resistance R13 and the in-phase input end of operational amplifier U5
It is connected, the one end of the in-phase input end of operational amplifier U5 also with capacitance C13 is connected, the other end ground connection of capacitance C13.
The inverter circuit includes capacitance C23, capacitance C19, capacitance C10, resistance R22, resistance R24, resistance R25, fortune
Calculate amplifier U6；One end of capacitance C10 is the input terminal of inverter circuit, and one end of resistance R25 is used for and bias voltage circuit
Output terminal be connected, the output terminal of operational amplifier U6 is the output terminal of inverter circuit；The other end and resistance of capacitance C10
R24 one end is connected, and the other end of resistance R24 is connected with the inverting input of operational amplifier U6, and operational amplifier U6's is anti-phase
The one end of input terminal also with resistance R22 and capacitance C19 is connected, and the other end of resistance R22 and capacitance C19 are with operational amplifier U4's
Output terminal is connected, and the other end of resistance R25 is connected with the in-phase input end of operational amplifier U6, and operational amplifier U6's is same mutually defeated
Enter the one end of end also with capacitance C23 to be connected, the other end ground connection of capacitance C23.
The cathode of the microphone is connected by resistance R2 with the output terminal of bias voltage circuit, the anode of the microphone
Ground connection.
With the above structure, a kind of circuit structure of sound pick-up of the utility model both passes through microphone pickup, moreover it is possible to logical
The first differential signal input mouth and the second differential signal input mouth access differential audio signal are crossed, and the utility model is also
The high high-amplitude of strong antijamming capability, signal-to-noise ratio is exported by the first differential signal outputs mouth and the second differential signal outputs mouth
Value difference multi-voice frequency signal, and amplitude difference audio signal is adapted to transmit on longer tone frequency channel wire, therefore the utility model band
There is the function of cascade and possess long distance transmission ability.
Brief description of the drawings
Fig. 1 is the functional block diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
Embodiment
In order to which the technical solution of the utility model is explained further, below by specific embodiment come to the utility model into
Row elaborates.
As shown in Figure 1, the utility model discloses a kind of circuit structure of sound pick-up, it includes microphone A, filter and amplification
It is circuit B, differential-to-single-ended circuit D, adder circuit C, inverter circuit E, the first differential signal outputs mouth In1, second poor
Sub-signal output port In2, the first differential signal input mouth Out1, the second differential signal input mouth Out2 and biased electrical
Volt circuit F.
Wherein described microphone A is connected with the input terminal of the filter amplification circuit B, and the filter amplification circuit B's is defeated
Outlet is connected with the first input end of the adder circuit C；The first differential signal input mouth In1 and described second poor
Sub-signal input port In2 is connected with two input terminals of the differential-to-single-ended circuit D with by the difference of other sound pick-ups respectively
Audio signal is input to differential-to-single-ended circuit D, and the output terminal of the differential-to-single-ended circuit D is with the adder circuit C's
Second input terminal is connected, and the output terminal of the adder circuit C is connected with the first differential signal outputs mouth Out1；It is described
Input terminal of the output terminal of adder circuit C also with the inverter circuit E is connected, the output terminal of the inverter circuit E with
The second differential signal outputs mouth Out2 is connected；The bias voltage circuit F is microphone A, filter amplification circuit B, difference
Divide and single-end circuit D, adder circuit C, inverter circuit E offer bias voltages are provided.
A kind of circuit structure of sound pick-up of the utility model can be poor by the first differential signal outputs mouth Out1 and second
Sub-signal output port Out2 output difference audio signals, moreover it is possible to pass through the first differential signal input mouth In1 and the second difference
Signal input port In2 access differential audio signals；Therefore the utility model carries cascade function, i.e. rear class sound pick-up exports
Difference audio signal can be input to the first differential signal input mouth In1 and the second differential signal input mouth of prime sound pick-up
Exported again after In2.
During utility model works, the audio signal that is produced after microphone A pickups is input to filter amplification circuit B and is put
Eliminate the first single-ended audio signal for becoming amplitude after the outer interference signal of audio during Datong District, and what rear class sound pick-up transmitted
Difference audio signal is linked into difference by the first differential signal input mouth In1 and the second differential signal input mouth In2 and turns
Become the second single-ended audio signal after single-end circuit D；And the second single-ended audio signal and the first single-ended audio signal are again via adding
Adder circuit C is overlapped the first difference audio signal of output amplitude, and then the first difference audio signal is via first
The second difference audio while differential signal outputs mouth Out1 is exported also via inverter circuit E anti-phase output amplitude is believed
Number, the second difference audio signal is then exported via the second differential signal outputs mouth Out2；First difference audio signal and first
Difference audio signal is the difference audio signal of the utility model output, therefore the utility model can be microphone A generations
Audio signal switchs to the output of amplitude difference audio signal, since amplitude difference audio signal has strong antijamming capability, letter
Make an uproar than high characteristic, be adapted to transmit on longer tone frequency channel wire, so the utility model possesses the energy of long distance transmission ability
Power.
Coordinate Fig. 2, be specifically described the particular circuit configurations of following the utility model below.
The bias voltage circuit F includes power end VCC, resistance R16, resistance R19, capacitance C17, operational amplifier U3；
One end of the power end VCC connecting resistances R16, the in-phase input end of the other end concatenation operation amplifier U3 of the resistance R16,
The other end of the resistance R16 is also connected with the other end ground connection of one end of resistance R19 and capacitance C17, resistance R19 and capacitance C17,
The inverting input of operational amplifier U3 is connected with the output terminal of operational amplifier U3, and the output terminal of operational amplifier U3 is biasing
The output terminal of potential circuit F.
The cathode of the microphone A is connected by resistance R2 with the output terminal of bias voltage circuit F, the microphone A's
Anode is grounded.
The filter amplification circuit B includes MFB circuit of high pass filter B1 and MFB low-pass filter circuits B2, the MFB
The input terminal of circuit of high pass filter B1 is the input terminal of the filter amplification circuit B, the MFB low-pass filter circuits B2's
Output terminal is the output terminal of the filter amplification circuit B, and the output terminal of the MFB circuit of high pass filter B1 is low with the MFB
The input terminal of bandpass filter circuit B2 is connected.Wherein described MFB circuit of high pass filter B1 includes capacitance C1, capacitance C2, capacitance
C4, capacitance C7, resistance R1, resistance R6, resistance R8, operational amplifier U1；One end of capacitance C2 is MFB circuit of high pass filter B1
Input terminal, one end of resistance R6 is used to be connected with the output terminal of bias voltage circuit F, and the output terminal of operational amplifier U1 is
The output terminal of MFB circuit of high pass filter B1；The other end of capacitance C2 is connected with one end of capacitance C1 and capacitance C4, capacitance C4's
The one end of one end also with resistance R8 is connected, the other end ground connection of resistance R8；The other end of capacitance C1 is connected with one end of resistance R1,
The other end of resistance R1 is connected with the other end of capacitance C4, the inverting input of the other end of capacitance C4 also with operational amplifier U1
It is connected；The other end of resistance R6 is connected with the in-phase input end of operational amplifier U1, and the other end of resistance R6 is also with capacitance C7's
One end is connected, the other end ground connection of capacitance C7.The MFB low-pass filter circuits B2 include capacitance C3, capacitance C5, capacitance C8,
Resistance R3, resistance R4, resistance R5, resistance R7, operational amplifier U2；One end of capacitance C5 is MFB low-pass filter circuits B2's
Input terminal, one end of resistance R7 are used to be connected with the output terminal of bias voltage circuit F, and the output terminal of operational amplifier U2 is MFB
The output terminal of low-pass filter circuit B2；The other end of capacitance C5 is connected with one end of resistance R4, the other end and the electricity of resistance R4
Appearance C6, resistance R3, one end of resistance R5 are connected, the other end ground connection of capacitance C6, the other end of resistance R3 and one end of capacitance C3
It is connected, the other end of capacitance C3 is connected with the other end of resistance R5, and the other end of resistance R5 is also anti-phase with operational amplifier U2
Input terminal is connected；The other end of resistance R7 is connected with the in-phase input end of operational amplifier U1, the other end of resistance R7 also with electricity
The one end for holding C8 is connected, the other end ground connection of capacitance C8.By setting MFB circuit of high pass filter B1 and MFB low-pass filters
Circuit B2 can cause the audio signal that microphone A is produced to carry out two-stage amplification and can filter out low-frequency interference signal and High-frequency Interference
Signal so that the audio signal that microphone A is produced becomes the first single-ended audio signal of amplitude, therefore with stronger anti-dry
Disturb ability.
The differential-to-single-ended circuit D includes resistance R12, resistance R17, resistance R20, resistance R23, capacitance C16, capacitance
C18, capacitance C12, capacitance C22, operational amplifier U4；One end of capacitance C16 is the first input end of differential-to-single-ended circuit D,
One end of capacitance C17 is the second input terminal of differential-to-single-ended circuit D, and one end of resistance R23 is used for bias voltage circuit F's
Output terminal is connected, and the output terminal of operational amplifier U4 is the output terminal of differential-to-single-ended circuit D；The other end of capacitance C16 and electricity
Resistance R17 one end is connected, and the other end of resistance R17 is connected with the inverting input of operational amplifier U4, and operational amplifier U4's is anti-
The one end of phase input terminal also with resistance R12 and capacitance C12 is connected, the other end and the operational amplifier U4 of resistance R12 and capacitance C12
Output terminal be connected, the other end of capacitance C18 is connected with one end of resistance R20, the other end of resistance R20 and operational amplifier U4
In-phase input end be connected, one end of resistance R23 is connected with one end of capacitance C22, and the in-phase input end of operational amplifier U4 is also
It is connected with the other end of resistance R23 and capacitance C22.
The adder circuit C includes capacitance C9, capacitance C11, capacitance C13, resistance R9, resistance R10, resistance R13, resistance
R15, operational amplifier U5；One end of capacitance C9 is the first input end of adder circuit C, and one end of capacitance C11 is adder
The second input terminal of circuit C, one end of resistance R13 are used to be connected with the output terminal of bias voltage circuit F, operational amplifier U5's
Output terminal is the output terminal of adder circuit C；The other end of capacitance C9 is connected with resistance R10 one end, the other end of resistance R10 with
The inverting input of operational amplifier U5 is connected；The other end of capacitance C11 is connected with resistance R15 one end, the other end of resistance R15
It is connected with the inverting input of operational amplifier U5;One end of resistance R9 is connected with the inverting input of operational amplifier U5, electricity
The other end of resistance R9 is connected with the output terminal of operational amplifier U5；The other end of resistance R13 is same mutually defeated with operational amplifier U5's
Enter end to be connected, the one end of the in-phase input end of operational amplifier U5 also with capacitance C13 is connected, the other end ground connection of capacitance C13.
The inverter circuit E includes capacitance C2, capacitance C19, capacitance C10, resistance R22, resistance R24, resistance R25, fortune
Calculate amplifier U6；One end of capacitance C10 is the input terminal of inverter circuit E, and one end of resistance R25 is used for and bias voltage circuit
The output terminal of F is connected, and the output terminal of operational amplifier U6 is the output terminal of inverter circuit E；The other end and resistance of capacitance C10
R24 one end is connected, and the other end of resistance R24 is connected with the inverting input of operational amplifier U6, and operational amplifier U6's is anti-phase
The one end of input terminal also with resistance R22 and capacitance C19 is connected, and the other end of resistance R22 and capacitance C19 are with operational amplifier U4's
Output terminal is connected, and the other end of resistance R25 is connected with the in-phase input end of operational amplifier U6, and operational amplifier U6's is same mutually defeated
Enter the one end of end also with capacitance C23 to be connected, the other end ground connection of capacitance C23.
To sum up, a kind of circuit structure of sound pick-up of the utility model both passes through microphone A pickups, moreover it is possible to passes through the first difference
Signal input port In1 and the second differential signal input mouth In2 access differential audio signals, and the utility model also passes through
First differential signal outputs mouth Out1 and the second differential signal outputs mouth Out2 outputs strong antijamming capability, signal-to-noise ratio are high
Amplitude difference audio signal, and amplitude difference audio signal is adapted to transmit on longer tone frequency channel wire, therefore this practicality is new
Function of the type with cascade simultaneously possesses long distance transmission ability.
The product form and style of above-described embodiment and schema and non-limiting the utility model, any technical field
The appropriate change or modification that those of ordinary skill does it, all should be regarded as not departing from the patent category of the utility model.
Claims (9)
- A kind of 1. circuit structure of sound pick-up, it is characterised in that：Including microphone, filter amplification circuit, differential-to-single-ended circuit, Adder circuit, inverter circuit, the first differential signal outputs mouth, the second differential signal outputs mouth, the first differential signal Input port, the second differential signal input mouth and for microphone, filter amplification circuit, differential-to-single-ended circuit, adder Circuit, inverter circuit provide the bias voltage circuit of bias voltage；The microphone is connected with the input terminal of the filter amplification circuit, and the output terminal of the filter amplification circuit adds with described The first input end of adder circuit is connected；The first differential signal input mouth and the second differential signal input mouth point It is not connected with two input terminals of the differential-to-single-ended circuit, the output terminal of the differential-to-single-ended circuit and adder electricity Second input terminal on road is connected, and the output terminal of the adder circuit is connected with the first differential signal outputs mouth；It is described Input terminal of the output terminal of adder circuit also with the inverter circuit is connected, the output terminal of the inverter circuit with it is described Second differential signal outputs mouth is connected.
- A kind of 2. circuit structure of sound pick-up as claimed in claim 1, it is characterised in that：The bias voltage circuit includes electricity Source VCC, resistance R16, resistance R19, capacitance C17, operational amplifier U3；One end of the power end VCC connecting resistances R16, the other end concatenation operation amplifier U3's of the resistance R16 is same mutually defeated Enter end, the other end of the resistance R16 is also connected with the other end of one end of resistance R19 and capacitance C17, resistance R19 and capacitance C17 Ground connection, the inverting input of operational amplifier U3 are connected with the output terminal of operational amplifier U3, the output terminal of operational amplifier U3 For the output terminal of bias voltage circuit.
- A kind of 3. circuit structure of sound pick-up as claimed in claim 1, it is characterised in that：The filter amplification circuit includes MFB circuit of high pass filter and MFB low-pass filter circuits, the input terminal of the MFB circuit of high pass filter is the filtering The input terminal of amplifying circuit, the output terminal of the MFB low-pass filter circuits is the output terminal of the filter amplification circuit, described The output terminal of MFB circuit of high pass filter is connected with the input terminal of the MFB low-pass filter circuits.
- A kind of 4. circuit structure of sound pick-up as claimed in claim 3, it is characterised in that：The MFB circuit of high pass filter Including capacitance C1, capacitance C2, capacitance C4, capacitance C7, resistance R1, resistance R6, resistance R8, operational amplifier U1；One end of capacitance C2 is the input terminal of MFB circuit of high pass filter, and one end of resistance R6 is used for and bias voltage circuit Output terminal is connected, and the output terminal of operational amplifier U1 is the output terminal of MFB circuit of high pass filter；The other end of capacitance C2 is connected with one end of capacitance C1 and capacitance C4, one end phase of one end of capacitance C4 also with resistance R8 Even, the other end ground connection of resistance R8；The other end of capacitance C1 is connected with one end of resistance R1, the other end and the capacitance C4 of resistance R1 The other end be connected, the inverting input of the other end of capacitance C4 also with operational amplifier U1 is connected；The other end of resistance R6 with The in-phase input end of operational amplifier U1 is connected, and the one end of the other end of resistance R6 also with capacitance C7 is connected, and capacitance C7's is another End ground connection.
- A kind of 5. circuit structure of sound pick-up as claimed in claim 3, it is characterised in that：The MFB low-pass filter circuits Including capacitance C3, capacitance C5, capacitance C8, resistance R3, resistance R4, resistance R5, resistance R7, operational amplifier U2；One end of capacitance C5 is the input terminal of MFB low-pass filter circuits, and one end of resistance R7 is used for and bias voltage circuit Output terminal is connected, and the output terminal of operational amplifier U2 is the output terminal of MFB low-pass filter circuits；The other end of capacitance C5 is connected with one end of resistance R4, the other end and capacitance C6, resistance R3, the one of resistance R5 of resistance R4 End is connected, and the other end ground connection of capacitance C6, the other end of resistance R3 is connected with one end of capacitance C3, the other end and the electricity of capacitance C3 The other end of resistance R5 is connected, and the inverting input of the other end of resistance R5 also with operational amplifier U2 is connected；Resistance R7's is another End is connected with the in-phase input end of operational amplifier U1, and the one end of the other end of resistance R7 also with capacitance C8 is connected, capacitance C8's The other end is grounded.
- A kind of 6. circuit structure of sound pick-up as claimed in claim 1, it is characterised in that：The differential-to-single-ended circuit includes Resistance R12, resistance R17, resistance R20, resistance R23, capacitance C16, capacitance C18, capacitance C12, capacitance C22, operational amplifier U4；One end of capacitance C16 is the first input end of differential-to-single-ended circuit, and one end of capacitance C17 is differential-to-single-ended circuit Second input terminal, one end of resistance R23 are used to be connected with the output terminal of bias voltage circuit, and the output terminal of operational amplifier U4 is The output terminal of differential-to-single-ended circuit；The other end of capacitance C16 is connected with resistance R17 one end, the other end of resistance R17 and the anti-phase input of operational amplifier U4 End is connected, and the one end of the inverting input of operational amplifier U4 also with resistance R12 and capacitance C12 is connected, resistance R12 and capacitance The other end of C12 is connected with the output terminal of operational amplifier U4, and the other end of capacitance C18 is connected with one end of resistance R20, resistance The other end of R20 is connected with the in-phase input end of operational amplifier U4, and one end of resistance R23 is connected with one end of capacitance C22, fortune The other end of the in-phase input end of amplifier U4 also with resistance R23 and capacitance C22 is calculated to be connected.
- A kind of 7. circuit structure of sound pick-up as claimed in claim 1, it is characterised in that：The adder circuit includes capacitance C9, capacitance C11, capacitance C13, resistance R9, resistance R10, resistance R13, resistance R15, operational amplifier U5；One end of capacitance C9 is the first input end of adder circuit, and one end of capacitance C11 inputs for the second of adder circuit End, one end of resistance R13 are used to be connected with the output terminal of bias voltage circuit, and the output terminal of operational amplifier U5 is adder electricity The output terminal on road；The other end of capacitance C9 is connected with resistance R10 one end, the other end of resistance R10 and the inverting input of operational amplifier U5 It is connected；The other end of capacitance C11 is connected with resistance R15 one end, the other end of resistance R15 and the anti-phase input of operational amplifier U5 End is connected;One end of resistance R9 is connected with the inverting input of operational amplifier U5, the other end and operational amplifier of resistance R9 The output terminal of U5 is connected；The other end of resistance R13 is connected with the in-phase input end of operational amplifier U5, and operational amplifier U5's is same The one end of phase input terminal also with capacitance C13 is connected, the other end ground connection of capacitance C13.
- A kind of 8. circuit structure of sound pick-up as claimed in claim 1, it is characterised in that：The inverter circuit includes capacitance C23, capacitance C19, capacitance C10, resistance R22, resistance R24, resistance R25, operational amplifier U6；One end of capacitance C10 is the input terminal of inverter circuit, and one end of resistance R25 is used for the output terminal with bias voltage circuit It is connected, the output terminal of operational amplifier U6 is the output terminal of inverter circuit；The other end of capacitance C10 is connected with resistance R24 one end, the other end of resistance R24 and the anti-phase input of operational amplifier U6 End is connected, and the one end of the inverting input of operational amplifier U6 also with resistance R22 and capacitance C19 is connected, resistance R22 and capacitance The other end of C19 is connected with the output terminal of operational amplifier U4, the other end of resistance R25 and the homophase input of operational amplifier U6 End is connected, and the one end of the in-phase input end of operational amplifier U6 also with capacitance C23 is connected, the other end ground connection of capacitance C23.
- A kind of 9. circuit structure of sound pick-up as claimed in claim 1, it is characterised in that：The cathode of the microphone passes through electricity Resistance R2 is connected with the output terminal of bias voltage circuit, the anode ground connection of the microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721223486.0U CN207369275U (en) | 2017-09-22 | 2017-09-22 | A kind of circuit structure of sound pick-up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721223486.0U CN207369275U (en) | 2017-09-22 | 2017-09-22 | A kind of circuit structure of sound pick-up |
Publications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086101A (en) * | 2020-08-19 | 2020-12-15 | 广州亚美智造科技有限公司 | Noise reduction circuit, voice recognition module and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086101A (en) * | 2020-08-19 | 2020-12-15 | 广州亚美智造科技有限公司 | Noise reduction circuit, voice recognition module and electronic equipment |
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