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Sound noise reduction circuit and microphone

A sound and circuit technology, applied in the field of sound noise reduction circuits and microphones, can solve problems such as poor noise reduction effects, and achieve the effect of improving noise reduction effects

Active Publication Date: 2020-11-24
SIEBENHAAR SHANGHAI OFFSHORE EQUIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a sound noise reduction circuit and a microphone to improve the above-mentioned problem of poor noise reduction effect

Method used

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  • Sound noise reduction circuit and microphone
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  • Sound noise reduction circuit and microphone

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0037] see figure 1 , the embodiment of the present invention provides a sound noise reduction circuit 100, the sound noise reduction circuit 100 is applied to the microphone 10, and is used to perform noise reduction processing on the sound signal, the sound noise reduction circuit 100 includes an input circuit 110, a gain adjustment circuit 120, a subtraction The circuit 130 , the frequency band limiting circuit 140 and the output circuit 150 , the input circuit 110 , the gain adjustment circuit 120 , the subtraction circuit 130 , the frequency band limiting circuit 140 and the output circuit 150 are electrically connected in sequence.

[0038] Please refer to figure 2 and image 3 , the input circuit 110 includes a first adding unit 111 and an input amplifying unit 112 , both of the first adding unit 111 and the input amplifying unit 112 are electrically connected to the gain adjustment circuit 120 .

[0039] In the embodiment of the present invention, the first adding uni...

no. 2 example

[0062] see Figure 14 The embodiment of the present invention provides a microphone 10, which includes the sound noise reduction circuit 100 provided in the first embodiment of the present invention. The sound noise reduction circuit 100 can be arranged inside the microphone 10 for sound noise reduction.

[0063] In summary, the sound noise reduction circuit and the microphone provided by the present invention, the input circuit includes a first addition unit and an input amplification unit, by setting a plurality of sub-microphones and a main microphone to receive sound signals together, the first addition unit converts a plurality of second The sound signals received by a sensor are added to generate a first audio signal, the input amplification unit amplifies the received sound signals to generate a second audio signal, and the gain adjustment circuit is used to adjust the gain so that the gain of the first audio signal is the same as the second audio signal The gains of th...

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PUM

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Abstract

The invention relates to the technical field of audio noise reduction, and provides a sound noise reduction circuit and a microphone, wherein, the sound noise reduction circuit comprises an input circuit, a gain adjustment circuit and a subtraction circuit electrically connected in turn; the input circuit comprises a first adding unit and an input amplifying unit, wherein the first adding unit andthe input amplifying unit are electrically connected with the gain adjusting circuit; the first adding unit is configured to receive the sound signal and add the sound signal to generate a first audio signal. The input amplification unit is configured to receive the sound signal and amplify the generated second audio signal. The gain adjusting circuit is used for adjusting the gain to make the gain of the first audio signal equal to the gain of the second audio signal and outputting the first sound adjusting signal and the second sound adjusting signal. The subtracting circuit is used for subtracting and amplifying the first sound adjustment signal and the second sound adjustment signal to obtain the third audio signal after noise reduction. The subtracting circuit is used for subtractingand amplifying the first sound adjustment signal and the second sound adjustment signal to obtain the third audio signal after noise reduction. The sound noise reduction circuit and the microphone provided by the invention improve the problem that the noise reduction effect of the side direction sound source in the prior art is not good.

Description

technical field [0001] The invention relates to the technical field of audio noise reduction, in particular to a sound noise reduction circuit and a microphone. Background technique [0002] The microphone not only picks up the voice signal but also picks up the surrounding environmental noise. Too much environmental noise will affect people's reception of voice signals and cause voice failure. [0003] In the prior art, the dual-microphone technology is generally used for sound pickup, and the picked-up dual-microphone signals are subtracted in the circuit. This solution has a better effect on noise cancellation directly in front of the microphone, but for the side direction of the microphone due to the sound source When the sound waves arrive at the two microphones, there will be intensity difference and phase difference, so the noise cancellation effect for side direction sound sources is not good. Contents of the invention [0004] The object of the present invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H04R2410/01
Inventor 施永忠丁庆勇顾宗林于冬冬
Owner SIEBENHAAR SHANGHAI OFFSHORE EQUIP TECH CO LTD