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Speech noise reduction method applied to dual-microphone small handheld device

A dual-microphone, voice noise reduction technology, applied in voice analysis, instruments, etc., can solve problems such as residual music noise, voice distortion, music noise, etc.

Active Publication Date: 2016-09-28
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0003] This approach produces musical noise in the presence of inconsistent background noise, and speech distortion when the secondary mic contains the desired speech component
In addition, the dual-channel filtering technology using phase difference (time delay estimation) will leave music noise, and the feasibility of calculating the sound source direction from the phase difference is based on far-field conditions and is not suitable for handheld near-field environments

Method used

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  • Speech noise reduction method applied to dual-microphone small handheld device
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  • Speech noise reduction method applied to dual-microphone small handheld device

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Embodiment Construction

[0093] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0094] Such as figure 1 As shown, it is a flow chart of a voice noise reduction method applied to a small handheld device with dual microphones provided by an embodiment of the present invention, which mainly includes the following steps:

[0095] Step 11, receiving the voice signal of the dual microphones, and discriminating the call mode;

[0096] Step 12. If it is currently in the handheld call mode, use a voice noise reduction method based on ...

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Abstract

The invention discloses a speech noise reduction method applied to a dual-microphone small handheld device. A corresponding noise reduction method can be selected according to a different mode used by a user. In a normal handheld conversation mode, a method based on power level differences is applied to a near field signal model in the mode, and large difference information in the energy of speech signal receiving by primary and secondary microphones can be effectively used; in a loudspeaker using mode, when a method based on relevance between the two microphones is used, estimation of a noise power spectrum is not needed, and influences of inconsistency noise receiving by the two microphones on the method based on power level differences can be avoided; and in addition, compared with the traditional method based on the power level differences, the method of the invention can effectively avoid music noise caused by error power spectrum estimation through built Wiener filtering.

Description

technical field [0001] The invention relates to the technical field of speech noise reduction, in particular to a speech noise reduction method applied to a small handheld device with two microphones. Background technique [0002] In existing small handheld devices, dual microphones and three microphones are often used. In the prior art, the primary microphone is used to receive the desired voice and background noise, and the secondary microphone is used to receive the background noise. Assuming that the background noise received by the two microphones is consistent, the difference between the signals received by the two microphones is used as the desired signal output. [0003] This approach produces musical noise where the background noise is inconsistent, and speech distortion when the secondary microphone contains the desired speech component. In addition, the dual-channel filtering technology using phase difference (time delay estimation) will leave music noise, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216G10L21/0224G10L25/21
CPCG10L21/0216G10L21/0224G10L25/21G10L2021/02165
Inventor 叶中付鲍光照罗友
Owner UNIV OF SCI & TECH OF CHINA
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