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Double-microphone voice noise reduction device and noise reduction method

A voice noise reduction, dual microphone technology, applied in voice analysis, instruments, etc., to achieve the effects of convenient processing, simple structure, and reduced noise reduction costs

Pending Publication Date: 2020-11-20
杭州芯声智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the beamforming composed of dual mics in this scheme has a main lobe that is too wide, and there are certain requirements for the distance between the dual mics.

Method used

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  • Double-microphone voice noise reduction device and noise reduction method
  • Double-microphone voice noise reduction device and noise reduction method
  • Double-microphone voice noise reduction device and noise reduction method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 As shown, a dual-microphone speech noise reduction device includes a first microphone 10 and a second microphone 20, the first microphone 10 and the second microphone 20 are on the same horizontal line, and the first microphone 10 is set to be 0° of the mouth direction, the second microphone 20 is 180° away from the mouth, and the distance between the first microphone 10 and the second microphone 20 is 1.1 cm.

Embodiment 2

[0048] A dual-microphone speech noise reduction device, comprising a first microphone 10 and a second microphone 20, the first microphone 10 and the second microphone 20 are on the same horizontal line, and the first microphone 10 is set to be in the 0° direction of the mouth, then The second microphone 20 is 180° away from the mouth, and the distance between the first microphone 10 and the second microphone 20 is 3 cm.

Embodiment 3

[0050] A dual-microphone speech noise reduction device, comprising a first microphone 10 and a second microphone 20, the first microphone 10 and the second microphone 20 are on the same horizontal line, and the first microphone 10 is set to be in the 0° direction of the mouth, then The second microphone 20 is 180° away from the mouth, and the distance between the first microphone 10 and the second microphone 20 is 2 cm.

[0051] In the above-mentioned embodiment, there is no problem that the main lobe of beamforming composed of dual mics is too wide, and the distance requirements for the dual mics are not high, which can not only achieve the acquisition of dual-channel voice signals for noise reduction processing, but also reduce costs and The purpose of the device requirements.

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Abstract

The invention discloses a double-microphone voice noise reduction device. The device comprises a first microphone and a second microphone, wherein the first microphone and the second microphone are located on the same horizontal line, the first microphone is set to be in the 0-degree direction of the mouth, the second microphone is far away from the 180-degree direction of the mouth, and the distance between the first microphone and the second microphone ranges from 1.1cm to 3cm. The invention also discloses a double-microphone voice noise reduction method, which comprises the steps of firstly, receiving and acquiring two paths of voice signals s0 and s1, wherein the sampling rate is integral multiple of the sampling rate of actually processed data; then down-sampling to an actual samplingrate needing to be processed; performing spectral analysis on the down-sampled data, and iteratively calculating a filter coefficient; multiplying the filter by one path of input signal in a frequency domain, and performing inverse Fourier transform and overlapping addition to obtain an output voice signal s2. According to the invention, stable and non-stable voices in a non-target direction canbe effectively filtered to obtain processed clean voices; not only can an efficient noise reduction effect be achieved, but also the noise reduction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of speech noise reduction, in particular to a dual-microphone speech noise reduction device and a noise reduction method thereof. Background technique [0002] Dual microphone noise reduction technology refers to the use of two microphones as the receiving unit, through a series of signal processing, to complete the signal enhancement in a given direction and the attenuation of speech signals in non-receiving directions and environmental noise, so as to enhance the reception of speech in a given direction The purpose of the signal-to-noise ratio. [0003] In the prior art, one technique is to use the main microphone to receive the desired voice and background noise, and the secondary microphone to receive the background noise, and assume that the background noise received by the two microphones is consistent, and use the noise signal received by the secondary microphone as a reference Signal, carry out digi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0232G10L21/0208G10L21/0216
CPCG10L21/0232G10L21/0208G10L21/0216G10L2021/02165
Inventor 郭东风胡奎姜黎
Owner 杭州芯声智能科技有限公司
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