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Quaternary Differential Microphone Array Super-Directional Frequency Invariant Beamforming Method

A microphone array, frequency-invariant technology, applied in speech analysis, instruments, etc., can solve problems such as inability to accurately distinguish ambient noise and speech signals, and achieve the effect of overcoming hardware dependence

Active Publication Date: 2020-05-12
HUBEI UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the above technologies, to provide a four-element differential microphone array super-directional frequency invariant beamforming method to enhance speech, and to solve the problem that traditional speech enhancement methods cannot accurately distinguish between environmental noise and speech signals

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Embodiment Construction

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] A four-element differential microphone array super-directional frequency-invariant beamforming method, such as figure 1 shown, including the following steps:

[0047] A) The microphone array is composed of four omnidirectional microphone array elements evenly distributed on the unit circle, and the output signal of the microphone array is collected. In the microphone array, the mth microphone array element collects the sound signal:

[0048]

[0049] In the formula, 1≤m≤4, x m (ω) is the voice signal collected by the mth microphone array element, v m (ω) is the noise signal collected by the mth microphone array element, ω is the angular frequency, e is a natural constant, j is an imaginary unit, j 2 =-1, when 1≤m≤3, τ m is the time difference between the sound signal arriving at the mth microphone element and the next mi...

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Abstract

The invention relates to the field of speech enhancement, and discloses a quaternary differential microphone array super directivity frequency invariant beamforming method. An output signal of a microphone array is decomposed into a plurality of sub-frequency bands according to a frequency band after the output signal is collected, after compensation or inhibition, reconstitution and synthesis areconducted to obtain a target signal, and then directivity adjustment is conducted on the microphone array, a maximum directivity factor is obtained, maximum white noise suppression capability of themicrophone array is obtained, then the target signal is output after directivity treatment and white noise suppression treatment are conducted through the microphone array, then a matrix vector is designed, and the output signal is subjected to speech signal enhancement and noise signal suppression. According to the quaternary differential microphone array super directivity frequency invariant beamforming method.

Description

technical field [0001] The invention relates to the field of speech enhancement, in particular to a super-directivity frequency-invariant beamforming method of a four-element differential microphone array. Background technique [0002] Human-computer interaction is an important part of artificial intelligence. The quality of voice collection has become an issue of increasing concern, especially in complex acoustic environments. When collecting tiny voice signals, it is necessary to suppress environmental noise. In order to solve this problem, voice The beamforming technology came into being. [0003] In order to collect pure speech signals and suppress noise, there have been noise reduction methods based on microphone arrays and microphone beamforming noise suppression methods. Traditional noise suppression methods generally use methods such as spectral subtraction and Wiener filtering, but these methods will distort the frequency of the voice signal in low-frequency noise ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0216G10L21/02G10L21/0232
CPCG10L21/02G10L21/0216G10L2021/02166
Inventor 巩朋成郑毅豪饶鼎邵荣堂张正文孙家豪张祺
Owner HUBEI UNIV OF TECH
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