Binary microphone microarray voice beam forming method

A microphone and microarray technology, applied in the direction of frequency/direction characteristic devices, etc., can solve the problems of high algorithm complexity, poor versatility, and small application range

Inactive Publication Date: 2011-02-02
ZHEJIANG UNIV
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Problems solved by technology

[0006] In order to overcome the disadvantages of poor versatility, strong dependence on hardware, strict requirements on target sound source and noise source angle, high algorithm complexity and small application range in the prior art, the present invention provides a It has low dependen...

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  • Binary microphone microarray voice beam forming method
  • Binary microphone microarray voice beam forming method
  • Binary microphone microarray voice beam forming method

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Embodiment Construction

[0049] With reference to accompanying drawing, further illustrate the present invention:

[0050] The binary microphone microarray speech beamforming method comprises the following steps:

[0051] 1. Build a microphone microarray to receive external analog signals. A microarray is composed of two omnidirectional microphones; convert the received analog signal into a digital signal to be processed;

[0052] 2. Analyze the digital signal to obtain the relative time delay of the target sound source relative to the two microphones; according to the time delay, perform time delay correction on the digital signals corresponding to the two microphones to obtain the corrected signal; The corrected signal completes the fixed beamforming;

[0053] 3. According to the two corrected signals, use the blocking matrix to obtain the noise reference signal;

[0054] 4. Through the frequency domain adaptive processing algorithm, the fixed wave velocity is converted into a preliminary gain sig...

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Abstract

The invention discloses a binary microphone microarray voice beam forming method, which comprises the following steps of: constructing a microphone microarray so as to receive external signals; analyzing the signals to obtain relative time delay of a target sound source relative to two microphones; respectively carrying out time delay correction on digital signals corresponding to the two microphones according to the time delay to obtain corrected signals; completing fixed beam forming according to the two corrected signals; obtaining a noise reference signal by using a block matrix according to the two corrected signals; by using a frequency domain self-adaption processing algorithm, converting the fixed beam forming into a primary gain signal and converting the noise reference signal into an estimated noise reference signal; and removing noise energy out of the primary gain signal to obtain a final beam forming signal. The invention has the advantages of good generality, low dependence on hardware, no requirement on angles of the target sound source and a noise source, application to a moving environment, a mixed-sound environment and a nonstationary noise environment and good denoising effect.

Description

technical field [0001] The invention relates to the technical field of voice enhancement, in particular, the invention relates to a microphone microarray target voice beamforming method for the mobile phone field. Background technique [0002] At present, mobile phones have become an essential communication device in our daily life, so the quality of calls has become an issue of increasing concern, especially in a noisy environment, which will seriously affect the communication between the two parties. In order to solve this problem, voice noise reduction Technology came into being. [0003] In order to suppress noise, a single-channel noise reduction method and a microphone array beamforming noise suppression method have emerged. For single-channel noise, techniques such as spectral subtraction and Wiener filtering are commonly used. The disadvantages of these methods are that the suppression effect on non-stationary noise is poor, and it will cause large speech distortion...

Claims

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Application Information

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IPC IPC(8): H04R1/40
Inventor 钱沄涛杨立春王文宏沈言浩
Owner ZHEJIANG UNIV
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