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Echo elimination method and system based on microphone array

A microphone array, echo cancellation technology, applied in two-way sound reinforcement telephone system, speech analysis, instruments, etc., can solve the problem of affecting the natural call quality of full-duplex communication

Active Publication Date: 2018-08-07
厦门亿联通讯技术有限公司
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AI Technical Summary

Problems solved by technology

At this time, the far-end talker will receive the high and low pickup signal, which seriously affects the natural call quality of full-duplex communication.

Method used

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  • Echo elimination method and system based on microphone array
  • Echo elimination method and system based on microphone array
  • Echo elimination method and system based on microphone array

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Embodiment Construction

[0119] Such as figure 1 As shown, the present invention discloses a microphone array-based echo cancellation method, which specifically includes the following steps:

[0120] Step 1, to the multi-channel input time-domain audio signal x M Carry out framing and short-term time-frequency domain transformation to obtain the frequency domain input signal X n ; The reference signal ref is divided into frames, and the short-time time-frequency transformation is obtained to obtain the frequency-domain reference signal REF n .

[0121] Among them, the short-time time-frequency transform is an overlap-add method short-time Fourier transform (STFT), and the window function selects the Hanning window, and the obtained frequency domain input signal X n As shown in formula (2):

[0122]

[0123]Wherein, k=0,...,N / 2-1; N=2R, R is the frame length; m=0,...,M-1, M is the total number of microphones in the microphone array; n is the frame number. In subsequent steps, k all represent su...

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Abstract

The invention relates to an echo elimination method and system based on a microphone array; the method uses wave beam formation, linearity echo elimination and non-linear echo elimination triple structures to inhibit echo energy in pickup signals, wherein a wave beam forming module can stably inhibit direct sound wave signals in a horn direction without being affected by environment changes; a linearity echo elimination module can inhibit residual echo after wave beam formation, thus eliminating echo reflection portion; a non-linearity echo elimination module uses a reference signal and residual echo signal long time amplitude correlation degree to carry out gain inhibition, thus further inhibiting echo energy. The method and system can greatly improve the echo inhabitation effect while ensuring the pickup signal to be clear and nature, thus having stronger performance and better stability when compared with the prior art.

Description

technical field [0001] The invention relates to the field of audio signal processing, in particular to an echo cancellation method and system based on a microphone array. Background technique [0002] When a real-time communication device picks up sound with a microphone, it will be disturbed by environmental noise, reverberation, circuit noise, and also by echo. When the speech of the far-end talker is played through the receiver, the microphone picks up the receiver signal as well as the speaker's voice. The receiver signal will be transmitted directly to the microphone, and will also be transmitted to the microphone through object reflection, diffraction, resonance, etc. Therefore, while the far-end talker is talking, he will hear his own voice coming back from the other party. When the total delay between the signal processing system and communication exceeds 10ms, the speaker will perceive his own echo; when the total delay of the echo exceeds tens of milliseconds, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/0216H04M9/08
CPCG10L21/0208G10L21/0216G10L2021/02082G10L2021/02166H04M9/08G10L2021/02085
Inventor 张惠荣王伟廷朴志刚
Owner 厦门亿联通讯技术有限公司
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