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Microphone array channel mismatch calibration method based on Volterra filters

A technology of microphone array and calibration method, which is applied in the direction of electrical components, etc., can solve problems such as beamforming performance degradation, and achieve the effect of improving quality and performance

Inactive Publication Date: 2017-07-21
SYSU CMU SHUNDE INT JOINT RES INST +1
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Problems solved by technology

[0005] In order to solve the problem that the beamforming performance of the microphone array is degraded due to channel characteristic mismatch, the present invention provides a microphone array channel mismatch calibration method based on a Volterra filter, which can calibrate the output signal of the microphone array due to the linearity of the microphone array Distortion caused by non-linear mismatch effectively improves the performance of beamforming and improves the quality of voice communication

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  • Microphone array channel mismatch calibration method based on Volterra filters
  • Microphone array channel mismatch calibration method based on Volterra filters
  • Microphone array channel mismatch calibration method based on Volterra filters

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Embodiment 1

[0026] Such as figure 1 , 2 As shown, the voice signal s[n] from the sound source is received by the microphone array, and the microphone array outputs the signal x after receiving the voice signal 1 (t), x 2 (t), x 3 (t), x 4 (t),....,x N (t), for x 1 (t), x 2 (t), x 3 (t), x 4 (t),....,x N (t) Perform AD conversion to obtain the output signal x 1 [n],x 2 [n],x 3 [n], ... x N [n].

[0027] Such as figure 1 , 4 As shown, the method provided by the present invention first outputs the signal x 1 [n],x 2 [n],x 3 [n], ... x N [n] Construct a Volterra filter respectively, and use the minimum mean square error algorithm to output the signal x of each microphone 1 [n],x 2 [n],x 3 [n], ... x N The Volterra filter of [n] adjusts the parameters; then the output signal x of each microphone is 1 [n],x 2 [n],x 3 [n], ... x N [n] are respectively input to the corresponding Volterra filter for filter calibration processing. Finally, the output signals of each chan...

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Abstract

The invention relates to a microphone array channel mismatch calibration method based on Volterra filters. The method comprises the steps of S1, carrying out AD conversion on output signals of microphones; S2, establishing a Volterra filter for the output signal of each microphone, and carrying out parameter adjustment on the Volterra filters of the output signals of the microphones through utilization of a minimum mean square error algorithm, and inputting the output signals of the microphones into the corresponding Volterra filters for filter calibration; and S3, inputting the output signals after the filter calibration into a beam former, thereby obtaining a single sound signal.

Description

technical field [0001] The present invention relates to the technical field of speech processing, and more specifically, to a method for calibrating the channel mismatch of a microphone array based on a Volterra filter. Background technique [0002] In voice processing systems such as in-vehicle systems, conference calls, and multimedia conferences, the signal picked up by the microphone is usually a noisy voice signal due to factors such as reverberation, background noise, and interference. This not only affects the intelligibility of speech, but also affects the overall performance of the speech processing system. Therefore, effective noise suppression is required to enhance the quality of the speech signal. The microphone array has the characteristics of space selection and high signal gain, so it becomes an important means to capture the speaker's voice in the non-handheld intelligent voice processing system. In recent years, speech enhancement methods based on microph...

Claims

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Application Information

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IPC IPC(8): H04R29/00
CPCH04R29/004
Inventor 李宇何粤谭洪舟蔡彬农革
Owner SYSU CMU SHUNDE INT JOINT RES INST
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