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Directional speech enhancement method based on small microphone array

A microphone array and speech enhancement technology, applied in speech analysis, instruments, etc., can solve the problems of high noise correlation, limited distance between microphones, and difficulty in applying post-filtering, and achieve the effect of improving the signal-to-noise ratio.

Active Publication Date: 2009-11-25
INST OF ACOUSTICS CHINESE ACAD OF SCI +1
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AI Technical Summary

Problems solved by technology

However, due to the limited distance between the microphones of the small array and the high correlation of noise, post-filtering based on the correlation function is difficult to be applied.

Method used

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  • Directional speech enhancement method based on small microphone array
  • Directional speech enhancement method based on small microphone array
  • Directional speech enhancement method based on small microphone array

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 As shown, the stereo signal received by the two microphones is first delayed and subtracted, and the results x(t) and y(t) are regarded as a frame every 32ms, and the adaptive filter coefficient w(n) is calculated, where n is the frame number . If the number of sampling points contained in a frame signal is L, the adaptive filter coefficient can be obtained by the following formula:

[0031] w ( n ) = αw ( n - 1 ) + ( 1 - α ) Σ t = 0 L ...

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Abstract

The invention provides a directional speech enhancement method based on a small microphone array, which comprises the following steps of: 1) utilizing two fully directional microphones to acquire a sound signal; 2) utilizing a self-adaptive null-forming algorithm to perform data processing on the acquired sound signal to obtain a delay substraction signal x(t) and a signal z(t) after the self-adaptive filtering; 3) processing the x(t) and the z(t) to form speech spectrums, namely X (omega) and Z(omega) respectively; 4) calculating preliminary gain G'(omega) by utilizing a single-channel speech enhancement method according to the X (omega) and the Z(omega), and calculating the existence probability P(omega) of a target signal according to the X (omega) and the Z(omega); 5) utilizing the existence probability P(omega) of the target signal to amend the preliminary gain G'(omega) to obtain final gain G(omega), wherein the G(omega) is equal to (the G'(omega))Gm, and Gm is a preset minimum gain value; and 6) utilizing the final gain G(omega) to enhance the signal z(t) after the self-adaptive filtering to obtain a final enhanced speech signal r(t). The method can realize a directional speech enhancement algorithm in small volume, can obtain noise suppression to a greater extent, and improve the signal-to-noise ratio.

Description

technical field [0001] The present invention relates to the technical field of speech processing, and in particular, the present invention particularly relates to a microphone array-based directional speech enhancement method. Background technique [0002] The enhancement of speech signal and the elimination of noise have always been research hotspots. In response to this problem, there are already many algorithms based on microphone arrays to achieve the effect of enhancing speech signals while suppressing interference (including various noises and other speech). Microphone arrays are generally bulky and difficult to use in portable devices (such as mobile phones, etc.). Elko and Luo et al. proposed and developed an adaptive valley-forming algorithm (Elko and Nguyen, A steerable and variable first-order differential microphone array, ICASSP, 1997; Luo, et al.Adaptivenull-forming scheme in digital hearing aids, IEEE Trans .Signal Processing, 2002), directional speech enhan...

Claims

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Application Information

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IPC IPC(8): G10L21/02
Inventor 颜永红付强张恒
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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