Filtering method and device based on fixed beam forming

A fixed beam, post-filtering technology, applied in the field of signal processing, can solve the problem that the non-stationary interference signal cannot be effectively suppressed, and achieve the effect of effectively suppressing the interference signal and ensuring no distortion

Active Publication Date: 2018-12-28
出门问问创新科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of beamforming research, the inventor found that due to the presence of time-varying reverberation and side lobes in the beamforming algorithm in the real environment, and the constraints of sensor array geometry and intelligent terminal computing conditions, it cannot effectively suppress non- smooth jamming signal

Method used

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  • Filtering method and device based on fixed beam forming
  • Filtering method and device based on fixed beam forming
  • Filtering method and device based on fixed beam forming

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Embodiment 1

[0021] An embodiment of the present invention provides a filtering method based on fixed beamforming. In practical applications, the filtering method based on fixed beamforming can be applied to various occasions where voice signals need to be filtered to obtain clean voice signals, for example , In the field of speech recognition, in order to improve the accuracy of speech recognition, it is necessary to pre-process the speech signal containing interference signals collected by the sensor array before recognition to enhance the speech signal of the target user and remove environmental noise and other human voices. and other interference signals to obtain a clean user voice signal.

[0022] Specifically, the execution body of the filtering method based on fixed beamforming is a filtering device based on fixed beamforming, and the filtering device based on fixed beamforming can be built-in or externally connected to an electronic device.

[0023] In practical applications, the ...

Embodiment 2

[0045] Based on the foregoing embodiments, the embodiments of the present invention further provide another filtering method based on fixed beamforming, and each step in the foregoing embodiments is described in detail with specific examples. This method is used in the following scenarios: see image 3 As shown, it is assumed that the sensor array 30 is composed of M microphones that are uniformly distributed in a linear shape, and that there is a target sound source 31 and two interfering sound sources 32 in the space, where M is a positive integer, and the target sound The angle of the source 31 is θ s , the angles of the interfering sound source 32 are respectively and

[0046] The multi-channel voice signal in the above S101 will be introduced below.

[0047] Specifically, the signal x received by the Mth microphone at time t m (t) can be represented by the following formula (1).

[0048]

[0049] In formula (1), * denotes convolution, h sm (t) represents the i...

Embodiment 3

[0105] Based on the same inventive concept, as an implementation of the above method, the embodiment of the present invention provides a filtering device based on fixed beamforming. The embodiment of the device corresponds to the embodiment of the method described above. The details in the foregoing method embodiments are described one by one, but it should be clear that the device in this embodiment can correspondingly implement all the content in the foregoing method embodiments.

[0106] Figure 5 It is a schematic structural diagram of a filtering device based on fixed beamforming in Embodiment 3 of the present invention, see Figure 5 As shown, the device 50 includes: an obtaining unit 501, configured to obtain a multi-channel speech signal to be processed, wherein the multi-channel speech signal at least includes a speech signal from a target sound source and an interference signal from an interfering sound source; a beamforming unit 502, configured to perform fixed bea...

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Abstract

The invention provides a filtering method and device based on fixed beam forming. The method comprises steps that to-be-processed multi-channel voice signals are obtained, and the multi-channel voicesignals include at least a voice signal from a target sound source and an interference signal from an interference sound source; the multi-channel voice signal is subjected to fixed beam forming basedon at least two pre-set fixed beam forming coefficients directed to different directions to obtain a voice estimation signal and an interference estimation signal; a post-filtering parameter is calculated based on the voice estimation signal and the interference estimation signal; filtering processing of the voice estimation signal is performed based on the post-filtering parameter, and the processed voice signal is obtained. The method is advantaged in that the voice signal after beam forming is filtered through the post-filtering parameter, that the voice signal directed to the target soundsource is not distorted is guaranteed, and other interference signals are effectively suppressed.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of signal processing, and in particular, to a filtering method and device based on fixed beamforming. Background technique [0002] With the rise of smart homes and the Internet of Things, and the rapid popularization of electronic devices such as smart speakers, wearable devices, and smart phones, users have higher and higher requirements for the functions and intelligence of electronic devices. In order to make human-computer interaction more natural and simple , most electronic devices are equipped with intelligent voice interaction function. However, when the distance between the user and the electronic device is large, when the electronic device is picked up by the sensor array (such as a microphone array) at a long distance, due to the background noise (such as background music) contained in the real environment, other human voices, mixed Noise and other interferences will make t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216
CPCG10L21/0216G10L2021/02166
Inventor 孙思宁黄美玉
Owner 出门问问创新科技有限公司
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