A Speech Enhancement Method of Small Aperture Array Microphone
A speech enhancement, small aperture technology, applied in speech analysis, instruments, etc., can solve problems such as large amount of calculation, complex method, and complicated calculation, and achieve the effect of small amount of calculation, good noise suppression capability, and good noise suppression performance.
Inactive Publication Date: 2016-02-24
LIAONING UNIVERSITY OF TECHNOLOGY
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[0005] In the prior art, the microphone array speech enhancement method combining the fourth-order cross cumulant and the linear constrained minimum variance beamforming needs to estimate the direction vector of the speech signal in advance, which makes the calculation of the whole process more complicated. Fixed beamforming, independent component analysis Although the method of combining algorithm and post-filtering technology effectively suppresses the noise, the method is too complicated and requires a lot of calculation
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[0071] Specific embodiment: the experiment is carried out in an environment with reverberation and noise, and a uniform linear array is formed by 4 microphones with a spacing of 10cm. ), the noise source is located at (5m, 3.5m, 1.5m), the sampling frequency is 16kHz, and the reverberation model of the room adopts the Image model.
[0072] Table 1 Statistical table of different noise SNR
[0073]
[0074] It can be seen from Table 1 that this method has a better ability to suppress noise and can obtain very good results in both coherent noise field and incoherent noise field environments.
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The invention discloses a method for enhancing microphone voice through a small-bore array. According to the method, under the situation that priori knowledge such as a voice signal DOA and an array topological structure is unknown, according to the FastICA basic principle, an objective function with a separation matrix as a variable is built for an output variable, the output variable is maximized, independent isolated components are separated, and then post-processing is conducted. In the process, estimation on a voice source signal direction is removed, and calculated amount is saved.
Description
technical field [0001] The present invention relates to a space-time domain speech enhancement method, more specifically, to a small-aperture linear array blind beamforming speech enhancement method. Background technique [0002] In today's popular video conferencing, teleconferencing and other intelligent voice communication systems, due to the influence of reverberation, environmental noise and interference, the quality of the voice signal picked up by the microphone array will deteriorate , and this will directly affect the performance of speech coding and speech recognition systems. Therefore, effective noise suppression is required. [0003] Chinese patent application number 200910132345.1 discloses a method and device for speech enhancement. Wherein, the method includes: transforming the noisy speech signal to obtain the noisy speech signal in the frequency domain; setting the spectral variance of the previous frame and the square of the spectral amplitude of the pre...
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IPC IPC(8): G10L21/0208
Inventor 王冬霞秦亚光梅亚男刘艳军
Owner LIAONING UNIVERSITY OF TECHNOLOGY