Post-filtering method and device for beam forming, storage medium and equipment
A post-filtering and beam technology, applied in direction finders using ultrasonic/sonic/infrasonic waves, systems for determining direction or offset, speech analysis, etc. Signal quality and other issues, to achieve the effect of improving voice signal quality and suppressing directional interference
Pending Publication Date: 2022-03-29
深圳市联洲国际技术有限公司
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Problems solved by technology
An ideal beamformer has a gain of 1 for signals in the desired direction and a gain of 0 for other directions, but in real life, due to errors caused by various factors such as noise, it is difficult to achieve the beamformer alone. Interfering sound sources in other directions are completely eliminated, that is, it is difficult to obtain an ideal beamformer
Therefore, a post-filtering scheme is proposed, that is, a post-filtering algorithm is added after beamforming, and the gain of each frequency point is adjusted according to the first-order and second-order statistical characteristics of the desired sound source and the interference sound source. However, this scheme Cannot further suppress directional interference after beamforming, affecting voice signal quality
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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0044] see figure 1 , figure 1 It is a flowchart of a beamforming post-filtering method provided by an embodiment of the present invention, and the beamforming post-filtering method includes:
[0045] S1. Obtain M audio input signals received by M array elements in the microphone array;
[0046] S2. Using a sound source localization algorithm to perform sound source localization on the M audio input signals to obtain N sound source directions, wherein the N sound...
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The invention discloses a post-filtering method for beam forming. The post-filtering method comprises the following steps: acquiring M audio input signals in a microphone array; performing sound source positioning on the M audio input signals to obtain N sound source directions; fourier transform is carried out on the M audio input signals to obtain each frequency domain signal on each frequency point; on each frequency point, carrying out beam former calculation on N sound source directions to obtain expressions of every N beam formers; calculating the gain of each frequency point according to each N array response vectors and each N beam former expressions; the method comprises the following steps: constructing an equation set about an expression and gain of a beam former, and solving to obtain every N powers; performing power proportion calculation on each frequency point to obtain a gain parameter of each post-filter; and filtering each N-1 interference components according to the gain parameter of each post filter and the beam former expression of each expected sound source direction. By adopting the embodiment of the invention, the directional interference can be further suppressed.
Description
technical field [0001] The present invention relates to the field of speech signal processing, in particular to a beamforming post-filtering method, device, storage medium and equipment. Background technique [0002] At present, microphone arrays are widely used in the research of speech signal processing. Using the beamformer for the processing of the microphone array can make the microphone array spatially selective, that is, the sound source signal in a specified direction is allowed to pass, while the sound source signal in other directions is suppressed. An ideal beamformer has a gain of 1 for signals in the desired direction and a gain of 0 for other directions, but in real life, due to errors caused by various factors such as noise, it is difficult to achieve the beamformer alone. Interfering sound sources in other directions are completely eliminated, that is, it is difficult to obtain an ideal beamformer. Therefore, a post-filtering scheme is proposed, that is, a ...
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Login to View More IPC IPC(8): G10L19/26G10L21/0216G10L21/0232G06F17/14G01S3/802
CPCG10L19/26G10L21/0216G10L21/0232G06F17/14G01S3/802G10L2021/02166
Inventor 陈英博
Owner 深圳市联洲国际技术有限公司