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
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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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