CN218277040U - Gain change noise reduction circuit for capacitor sound head microphone - Google Patents
Gain change noise reduction circuit for capacitor sound head microphone Download PDFInfo
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- CN218277040U CN218277040U CN202222546384.XU CN202222546384U CN218277040U CN 218277040 U CN218277040 U CN 218277040U CN 202222546384 U CN202222546384 U CN 202222546384U CN 218277040 U CN218277040 U CN 218277040U
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Abstract
The utility model discloses a circuit of making an uproar falls in electric capacity sound head microphone gain change relates to audio input output field, and this circuit of making an uproar falls in electric capacity sound head microphone gain change includes: the audio input module is used for inputting audio information and outputting the audio information to the audio amplification module; the audio amplification module is used for amplifying audio information and outputting the audio information to the microphone output module; compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a traditional mechanical toggle switch of electronic switch circuit collocation, the circuit of electronic switch part connects on the high impedance sound head input circuit of electric capacity microphone, mechanical toggle switch connects on the circuit of the low impedance part of microphone, mechanical toggle switch has been realized and has been kept apart through electronic switch and microphone high impedance part's circuit, thereby the noise of microphone output when having avoided user's hand touch switch and other external interference sources to disturb, the pickup quality of microphone has been guaranteed, make user's acquisition good experience effect.
Description
Technical Field
The utility model relates to an audio input output field specifically is a circuit of making an uproar falls in electric capacity sound head microphone gain change.
Background
The capacitor sound head microphone on the market usually has the function of a gain attenuation selection switch (such as 0dB, -10dB, -20dB selection), and the function selection is to adopt the traditional mechanical toggle switch to select the gain attenuation function, and the switch is directly connected to the high impedance sound head input circuit of the microphone circuit.
Because of the high impedance circuit easily receives when touching the plastic handle on the switch in hand and other external interference sources carry out signal interference through the space coupling to make the great noise of microphone output, seriously influenced user's use and experienced, need improve.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a circuit of making an uproar falls in electric capacity sound head microphone gain change to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a capacitance head microphone gain change noise reduction circuit comprising:
the audio input module is used for inputting audio information and outputting the audio information to the audio amplification module;
the audio amplification module is used for amplifying audio information and outputting the audio information to the microphone output module;
the gain adjusting module is used for adjusting the mechanical toggle switch, changing the conduction state of an electronic switch of the audio input module and further changing the size of an audio signal output to the audio amplifying module by the audio input module;
the microphone output module is used for outputting audio information;
the audio input module is connected with the audio amplification module, the audio amplification module is connected with the microphone output module, and the gain adjustment module is connected with the audio input module.
As a further aspect of the present invention: the audio input module comprises a sound head, a capacitor C1, a resistor R5, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a field effect transistor G1, a field effect transistor G2, a resistor R7 and a resistor R8, one end of the sound head is grounded, the other end of the sound head is connected with one end of the capacitor C1 and one end of the resistor R5, the other end of the resistor R5 is connected with a polarization voltage, the other end of the capacitor C1 is connected with one end of the capacitor C2, one end of the capacitor C3 and the audio amplification module, the other end of the capacitor C2 is connected with one end of the resistor R1 and a second end of the field effect transistor G1, the other end of the resistor R1 is grounded, the first end of the field effect transistor G2 is grounded, the third end of the field effect transistor G1 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the gain adjustment module, the other end of the capacitor C3 is connected with one end of the resistor R2 and the second end of the field effect transistor G2, the other end of the resistor R7 is connected with the gain adjustment module.
As a further aspect of the present invention: the audio amplification module comprises a resistor R9, a field effect transistor T1, a resistor R10, a resistor R11, a resistor R12 and a resistor R13, wherein one end of the resistor R9 is connected with a power supply voltage VCC, the other end of the resistor R9 is connected with the first end of the field effect transistor T1, the third end of the field effect transistor T1 is connected with one end of the resistor R10, the audio input module, the second end of the field effect transistor T1 is connected with one end of the resistor R11 and one end of the resistor R13, the other end of the resistor R10 is connected with the other end of the resistor R11 and one end of the resistor R12, the other end of the resistor R12 is grounded, and the other end of the resistor R13 is grounded.
As a further aspect of the present invention: the gain adjustment module comprises a resistor R3, a resistor R4, a capacitor C6, a capacitor C7, a resistor R6, a switch K1A, a switch K1B, an interface 1, an interface 2, an interface 3, an interface 4, an interface 5, an interface 6, an interface 7, one end of the resistor R3 is connected with one end of the resistor R4, a power supply voltage VCC, one end of the capacitor C6 is connected with the other end of the resistor R3, an interface 7, the other end of the resistor R7 is grounded, the other end of the capacitor C6 is grounded, the other end of the resistor R4 is connected with the interface 1, an interface 5, one end of the capacitor C7, the other end of the resistor R8, the other end of the capacitor C7 is grounded, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected with one end of the switch K1A and one end of the switch K1B, the other end of the switch K1A is connected with the interface 1/2/3, the other end of the switch K1B is connected with the interface 5/6/7, and the interface 2 and the interface 6 are suspended.
As the utility model discloses further scheme again: the field effect transistor G1 and the field effect transistor G2 are P-channel field effect transistors.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a traditional mechanical toggle switch of electronic switch circuit collocation, the circuit of electronic switch part connects on the high impedance sound head input circuit of electric capacity microphone, mechanical toggle switch connects on the circuit of the low impedance part of microphone, mechanical toggle switch has been realized and has been kept apart through electronic switch and microphone high impedance part's circuit, thereby the noise of microphone output when having avoided user's hand touch switch and other external interference sources to disturb, the pickup quality of microphone has been guaranteed, make user's acquisition good experience effect.
Drawings
Fig. 1 is a schematic diagram of a gain-changing noise reduction circuit for a condenser microphone.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1, a gain-changing noise reduction circuit for a condenser microphone comprises:
the audio input module is used for inputting audio information and outputting the audio information to the audio amplification module;
the audio amplification module is used for amplifying audio information and outputting the audio information to the microphone output module;
the gain adjusting module is used for adjusting the mechanical toggle switch, changing the conduction state of an electronic switch of the audio input module and further changing the size of an audio signal output to the audio amplifying module by the audio input module;
the microphone output module is used for outputting audio information;
the audio input module is connected with the audio amplification module, the audio amplification module is connected with the microphone output module, and the gain adjustment module is connected with the audio input module.
In this embodiment: referring to fig. 1, the audio input module includes a sound head, a capacitor C1, a resistor R5, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a fet G1, a fet G2, a resistor R7, and a resistor R8, one end of the sound head is grounded, the other end of the sound head is connected to one end of the capacitor C1, one end of the resistor R5, the other end of the resistor R5 is connected to a polarization voltage, the other end of the capacitor C1 is connected to one end of the capacitor C2, one end of the capacitor C3, and the audio amplification module, the other end of the capacitor C2 is connected to one end of the resistor R1, the second end of the fet G1, the other end of the resistor R1 is grounded, the first end of the fet G1 is grounded, the third end of the fet G1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the gain adjustment module, the other end of the capacitor C3 is connected to one end of the resistor R2, the second end of the fet G2, the other end of the resistor R2 is connected to the gain adjustment module.
The sound head receives an audio signal, and the audio signal is output to the audio amplification module through the coupling capacitor C1.
In this embodiment: referring to fig. 1, the audio amplifying module includes a resistor R9, a fet T1, a resistor R10, a resistor R11, a resistor R12, and a resistor R13, one end of the resistor R9 is connected to the supply voltage VCC, the other end of the resistor R9 is connected to the first end of the fet T1, the third end of the fet T1 is connected to one end of the resistor R10 and the audio input module, the second end of the fet T1 is connected to one end of the resistor R11 and one end of the resistor R13, the other end of the resistor R10 is connected to the other end of the resistor R11 and one end of the resistor R12, the other end of the resistor R12 is grounded, and the other end of the resistor R13 is grounded.
The input audio signal is amplified through a field effect transistor T1 (N channel) and then output to the microphone output module to output the audio signal.
In this embodiment: referring to fig. 1, the gain adjustment module includes a resistor R3, a resistor R4, a capacitor C6, a capacitor C7, a resistor R6, a switch K1A, a switch K1B, an interface 1, an interface 2, an interface 3, an interface 4, an interface 5, an interface 6, an interface 7, one end of the resistor R3 is connected to one end of the resistor R4, a power supply voltage VCC, the other end of the resistor R3 is connected to one end of the capacitor C6, the interface 3, the interface 7, the other end of the resistor R7, the other end of the capacitor C6 is grounded, the other end of the resistor R4 is connected to the interface 1, the interface 5, one end of the capacitor C7, the other end of the resistor R8, the other end of the capacitor C7 is grounded, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected to one end of the switch K1A and one end of the switch K1B, the other end of the switch K1A is connected to the interface 1/2/3, the other end of the switch K1B is connected to the interface 5/6/7, and the interface 2 and the interface 6 are suspended.
The voltage of the third end (grid) of the field effect tube G1 and the field effect tube G2 is changed by turning the switch K1A and the switch K1B, so that the conduction conditions of the field effect tube G1 and the field effect tube G2 are changed, the strength of an audio signal output to the audio amplification module by the audio input module is further changed, the audio output by the microphone output module is changed, and the gain adjustment of 0dB, -10dB and-20 dB is realized.
In this embodiment: referring to fig. 1, the fets G1 and G2 are P-channel fets.
The P-channel fet is turned on when the third terminal (gate) is low.
The utility model discloses a theory of operation is: the audio input module inputs audio information, outputs the audio information to the audio amplification module, the audio amplification module amplifies the audio information and outputs the audio information to the microphone output module, the gain adjustment module adjusts the mechanical toggle switch to change the conduction state of an electronic switch of the audio input module, the audio signal output by the audio input module to the audio amplification module is changed, and the microphone output module outputs the audio information.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a circuit of making an uproar falls in change of electric capacity sound head microphone gain which characterized in that:
this electric capacity sound head microphone gain changes noise reduction circuit includes:
the audio input module is used for inputting audio information and outputting the audio information to the audio amplification module;
the audio amplification module is used for amplifying audio information and outputting the audio information to the microphone output module;
the gain adjusting module is used for adjusting the mechanical toggle switch, changing the conduction state of an electronic switch of the audio input module and further changing the size of an audio signal output to the audio amplifying module by the audio input module;
the microphone output module is used for outputting audio information;
the audio input module is connected with the audio amplification module, the audio amplification module is connected with the microphone output module, and the gain adjustment module is connected with the audio input module.
2. The circuit of claim 1, wherein the audio input module comprises a sound head, a capacitor C1, a resistor R5, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a fet G1, a fet G2, a resistor R7, and a resistor R8, one end of the sound head is grounded, the other end of the sound head is connected to one end of the capacitor C1 and one end of the resistor R5, the other end of the resistor R5 is connected to a polarization voltage, the other end of the capacitor C1 is connected to one end of the capacitor C2, one end of the capacitor C3, and an audio amplification module, the other end of the capacitor C2 is connected to one end of the resistor R1 and the second end of the fet G1, the other end of the resistor R1 is grounded, the first end of the fet G1 is grounded, the third end of the fet G1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to a gain adjustment module, the other end of the capacitor C3 is connected to one end of the resistor R2 and the second end of the fet G2, the other end of the resistor R7 is connected to a gain adjustment module.
3. The circuit of claim 1, wherein the audio amplifying module comprises a resistor R9, a fet T1, a resistor R10, a resistor R11, a resistor R12, and a resistor R13, one end of the resistor R9 is connected to the supply voltage VCC, the other end of the resistor R9 is connected to the first end of the fet T1, the third end of the fet T1 is connected to one end of the resistor R10 and the audio input module, the second end of the fet T1 is connected to one end of the resistor R11 and one end of the resistor R13, the other end of the resistor R10 is connected to the other end of the resistor R11 and one end of the resistor R12, the other end of the resistor R12 is grounded, and the other end of the resistor R13 is grounded.
4. The circuit of claim 2, wherein the gain adjustment module comprises a resistor R3, a resistor R4, a capacitor C6, a capacitor C7, a resistor R6, a switch K1A, a switch K1B, an interface 1, an interface 2, an interface 3, an interface 4, an interface 5, an interface 6, and an interface 7, one end of the resistor R3 is connected to one end of the resistor R4 and the supply voltage VCC, the other end of the resistor R3 is connected to one end of the capacitor C6, the interface 3, the interface 7, and the other end of the resistor R7, the other end of the capacitor C6 is grounded, the other end of the resistor R4 is connected to one end of the interface 1, the interface 5, one end of the capacitor C7 and the other end of the resistor R8, the other end of the capacitor C7 is grounded, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected to one end of the switch K1A and one end of the switch K1B, the other end of the switch K1A is connected to the interface 1/2/3, and the other end of the switch K1B is connected to the interface 5/6/7, the interface 2 and the interface 6.
5. The circuit for changing gain and reducing noise of a condenser microphone according to claim 2 or 4, wherein the fet G1 and the fet G2 are P-channel fets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222546384.XU CN218277040U (en) | 2022-09-26 | 2022-09-26 | Gain change noise reduction circuit for capacitor sound head microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222546384.XU CN218277040U (en) | 2022-09-26 | 2022-09-26 | Gain change noise reduction circuit for capacitor sound head microphone |
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| Publication Number | Publication Date |
|---|---|
| CN218277040U true CN218277040U (en) | 2023-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222546384.XU Active CN218277040U (en) | 2022-09-26 | 2022-09-26 | Gain change noise reduction circuit for capacitor sound head microphone |
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| Country | Link |
|---|---|
| CN (1) | CN218277040U (en) |
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- 2022-09-26 CN CN202222546384.XU patent/CN218277040U/en active Active
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