Microphone Array Spatial Filtering Method Based on Array Virtual Expansion

A technology of microphone array and virtual expansion matrix, which is applied in the directions of transducer circuits, sensors, electrical components, etc., to achieve the effect of improving voice enhancement, simple implementation and ensuring consistency

Inactive Publication Date: 2017-11-21
XIDIAN UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a spatial filtering method for microphone array speech enhancement, which solves the consistency of the whole frequency band during microphone array spatial filtering, so as to improve the spatial filtering performance and speech enhancement performance of the microphone array

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  • Microphone Array Spatial Filtering Method Based on Array Virtual Expansion
  • Microphone Array Spatial Filtering Method Based on Array Virtual Expansion
  • Microphone Array Spatial Filtering Method Based on Array Virtual Expansion

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Embodiment Construction

[0035] In order to make the above and other objects, features and advantages of the present invention more apparent, the following specifically cites the embodiments of the present invention, together with the accompanying drawings, for a detailed description as follows.

[0036] Aiming at the special requirements of microphone array voice enhancement processing, the present invention improves the noise, interference and echo suppression performance based on microphone array processing on the basis of array virtual extension, and improves the low-frequency beam directing performance through a microphone array virtual extension method, In turn, narrower main lobe beam width and lower side lobe level are obtained to reduce spatial noise, interference and echo signal reception. At the same time, the spatial filtering consistency of the microphone array in the full frequency band of speech processing is realized.

[0037] In the following description, a lot of specific details are...

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Abstract

The microphone array spatial domain filtering method based on array virtual expansion, the steps are: obtain the frequency domain segmentation microphone array data; calculate the frequency unit sequence for voice signal processing; form the frequency domain microphone array data corresponding to the frequency unit sequence; construct the target voice signal array steering matrix and virtual extended array steering matrix; estimate the array virtual extended matrix; perform virtual extended transformation on the array data corresponding to the frequency unit sequence; perform robust adaptive beamforming on the array data corresponding to the virtual extended array; output the virtual extended array according to The frequency domain segmented microphone array data format is combined to obtain the frequency domain segmented microphone array output data; the inverse Fourier transform is performed on each sub-segment data of the frequency domain segmented microphone array output data to obtain the time domain segmented array processing Speech signal: synthesize the output speech signal, and average the overlapping parts of adjacent sub-segment data to obtain the final microphone array output speech signal.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a spatial filtering method for voice signals, which can reduce the influence of spatial noise and other voice interference, and further enhance the signal-to-noise ratio of useful voice signals, and can be used for broadband signals such as communication, radar and sonar Spatial filtering and other fields. Background technique [0002] In speech signal processing, as a key device to improve speech quality, the microphone array is mainly used for speech signal enhancement such as noise suppression, echo cancellation, and speech signal selection, and is also used for azimuth determination and spatial position estimation of sound sources. Due to the spatial selectivity of the microphone array, the performance of speech acquisition and processing can be improved through spatial processing. However, due to the particularity of the speech signal, it also brings d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 刘聪锋杨洁朱燕张煜李平王兰美
Owner XIDIAN UNIV
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