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Audio signal extraction method and device based on parametric super-gain beamformer

An audio signal and parameterization technology, which is applied in the direction of instruments, speech analysis, and sound-generating devices, can solve problems such as difficult selection of loading factors, insufficient practicability, and difficulty in implementing super-gain beam technology, so as to alleviate the difficulty of loading factor selection , Strong practicability and simple implementation

Active Publication Date: 2019-12-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventor found in the research that although the super-gain beamforming based on diagonal loading in the related art can improve the white noise gain, the range of theoretical loading factors is from zero to infinity. In practical applications, it will be difficult to choose An appropriate loading factor leads to difficulties in the implementation of super-gain beamforming technology based on diagonal loading and insufficient practicability

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  • Audio signal extraction method and device based on parametric super-gain beamformer
  • Audio signal extraction method and device based on parametric super-gain beamformer
  • Audio signal extraction method and device based on parametric super-gain beamformer

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Embodiment 1

[0028] This embodiment provides an audio signal extraction method based on a parameterized super-gain beamformer. The execution subject of the embodiment of the present invention is an audio signal extraction server, and the audio signal extraction server first constructs a normalized autocorrelation of isotropic noise matrix, and then introduce parameters into the normalized autocorrelation matrix to construct a parametric super-gain beamformer, then obtain the audio signal collected by each sensor in the sensor array, and finally use the parametric super-gain beamformer to extract the audio signal, Get an audio signal from the desired direction. Wherein, the audio signal from the desired direction is referred to as the desired direction signal for short, and the audio signal extraction server can use any existing computing terminal, which will not be repeated here.

[0029] figure 2 It shows a schematic flowchart of an audio signal extraction method based on a parametric s...

Embodiment 2

[0094] Corresponding to the audio signal extraction method based on the parametric super-gain beamformer in Embodiment 1, this embodiment provides an audio signal extraction device based on a parametric super-gain beamformer, such as Figure 4 As shown, the device includes:

[0095] The matrix construction module 31 is used to obtain the structural information of the sensor array, and construct a normalized autocorrelation matrix of isotropic noise based on the structural information of the sensor array;

[0096] The beamformer construction module 32 is used to introduce parameters in the normalized autocorrelation matrix, and constructs a parameterized super-gain beamformer according to the normalized autocorrelation matrix after introducing the parameters;

[0097] A signal acquisition module 33, configured to acquire an audio signal collected by each sensor in the above-mentioned sensor array, the audio signal being a time-domain signal;

[0098] The signal extraction modu...

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Abstract

The invention provides an audio signal extraction method and apparatus based on a parameterization supergain beam former. The method comprises the following steps: obtaining structure information of a sensor array, and based on the structure information of the sensor array, constructing normalization autocorrelation matrix of isotropic noise; introducing parameters in the normalization autocorrelation matrix, and according to the normalization autocorrelation matrix after the parameters are introduced, constructing parameterization supergain beam former; obtaining audio signals acquired by each sensor in the sensor array, wherein the audio signals are time domain signals; and extracting the audio signals by use of the parameterization supergain beam former to obtain audio signals from an expected direction. According to the audio signal extraction method and apparatus based on the parameterization supergain beam former, a quite good balance can be obtained between white-noise gains and directive factors simply by selecting one proper parameter in a quite small scope, the implementation is simple, and the practicality is high.

Description

technical field [0001] The invention relates to the field of acoustic signal processing, in particular to an audio signal extraction method and device based on a parametric super-gain beamformer. Background technique [0002] Beamforming technology has a wide range of applications in the field of signal processing. It usually uses sensor arrays to form a filter in space. The direction of the filter with the largest response is aligned with the desired direction. The suppression of interference by the filter depends on the filtering in the interference direction magnitude of the sensor response. figure 1 A schematic diagram showing the response of the sensor array in the related art, such as figure 1 As shown, the sensor array has the largest response in the 0° direction. [0003] Beamforming can be roughly divided into two categories, one is fixed beamforming and the other is adaptive beamforming. The filter coefficients of fixed beamforming do not change with the change ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/008G10L21/02G10K11/34
CPCG10K11/34G10L19/008G10L21/02
Inventor 陈景东黄公平雅各布·贝内斯蒂
Owner NORTHWESTERN POLYTECHNICAL UNIV