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Method and apparatus for noise elimination of microphone array

A technology of microphone array and noise elimination, which is applied in the field of signal processing, can solve problems affecting the effect of noise elimination, achieve the effects of improving stability, improving matching, and ensuring voice quality

Inactive Publication Date: 2008-06-18
江苏博悦物联网技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a noise elimination method for a microphone array, which is used to solve the problem in the prior art that the effect of noise elimination is affected when two microphones do not match

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  • Method and apparatus for noise elimination of microphone array
  • Method and apparatus for noise elimination of microphone array

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Embodiment Construction

[0030] The embodiment of the present invention aims at the problem that the mismatch of two microphones in the prior art will affect the noise cancellation effect of a small-distance single full-dual microphone array, and proposes a method of calibrating the gain of the target direction signal collected by the two microphones to be the same to improve the two microphones. The matching of the microphone, and the noise elimination processing on the calibrated signal improves the stability of the noise elimination effect and ensures the voice quality.

[0031] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] The small-distance-single-full dual-microphone array in the embodiment of the present invention refers to the use of a cardioid unidirectional microphone and an omnidirectional microphone to form a shoulder-to-shoulder dual-microphone array, and the distance...

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Abstract

The invention discloses a method for eliminating noises of microphone array. The microphone array comprises a unidirectional microphone and an omnidirectional microphone. The procedures are as follows: calibrating the gain of the target direction signal collected by two microphones, so as to lead the target direction signal collected by the two microphones to have the same gain; decreasing the signal collected by the two microphones, which has already calibrated; judging if target speech signal exists in the signal collected by the unidirectional microphone according to average energy of the signal difference between the signal collected by the unidirectional microphone and the signal collected by the two microphones which has already decreased; if target speech signal exists, noise in the signal collected by the unidirectional microphone is eliminated by adopting adaptive filter coefficients from fixed frequency domain; if target speech signal does not exist, noise in the signal collected by the unidirectional microphone is eliminated by adopting adaptive filter coefficients from a new frequency domain.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for eliminating noise of a microphone array. Background technique [0002] The microphone array has a larger size, consisting of at least two microphones, and the distance between the microphones is also relatively large, and is mostly used on a laptop or a camera with sound collection function; there is also a smaller size, consisting of only two microphones, Moreover, the distance between the two microphones is small, and it is mostly used in small devices such as mobile phones. [0003] A single full dual-microphone array with a small distance is composed of a unidirectional microphone and an omnidirectional microphone, and the distance between the two microphones is relatively small. [0004] At present, microphone array algorithms are increasingly used in noise cancellation. The microphone array algorithm mainly uses the difference between the...

Claims

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Application Information

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IPC IPC(8): H04R3/02
Inventor 张晨冯宇红
Owner 江苏博悦物联网技术有限公司
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