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Residual echo inhibition method and device

A residual echo and filter coefficient technology, applied in the field of residual echo suppression methods and devices, can solve problems such as poor sound quality, unclean residual echo elimination, and inability to adapt to changing application environments.

Active Publication Date: 2016-02-17
SUZHOU KEDA TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the residual echo cancellation method in the prior art cannot adapt to the changeable application environment, and the residual echo cancellation is not clean or the sound quality is poor due to voice suppression. Thereby providing a residual echo suppression method and device

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  • Residual echo inhibition method and device

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Embodiment 1

[0069] This embodiment provides a residual echo suppression method, such as figure 1 shown, including the following steps:

[0070] S1: Obtain the energy of the error signal in the echo filtering process, the cross-power spectral density of the error signal and the signal collected by the near-end microphone, the self-power spectral density of the error signal, the signal energy collected by the near-end microphone, and the reverberation power of the reference signal Spectral density and sound attenuation coefficient of echo, the reference signal is obtained from the signal transmitted from the far end to the near end;

[0071] S2: Calculate the filter coefficient of the frequency domain Wiener filter according to the energy of the signal collected by the near-end microphone and the energy of the error signal;

[0072] S3: Calculate a filter coefficient similar to Wiener filtering according to the cross-power spectral density of the error signal and the signal collected by th...

Embodiment 2

[0119] This embodiment provides a residual echo suppression device, such as Figure 5 shown, including:

[0120] The obtaining unit U1 is used to obtain the energy of the error signal in the echo filtering process, the cross-power spectral density of the error signal and the signal collected by the near-end microphone, the self-power spectral density of the error signal, the signal energy collected by the near-end microphone, and the reference signal The reverberation power spectral density and the sound attenuation coefficient of the echo, the reference signal is obtained according to the signal transmitted from the far end to the near end;

[0121] The filter coefficient calculation unit U2 of the Wiener filter is used to calculate the filter coefficient of the Wiener filter in the frequency domain according to the energy of the signal collected by the near-end microphone and the energy of the error signal;

[0122] The filter coefficient calculation unit U3 similar to the ...

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Abstract

The invention provides a residual echo inhibition method and device. The method comprises steps of: acquiring the energy of an error signal in an echo filtering process, the cross-power spectrum density of the error signal and a near-end microphone acquisition signal, the self-power spectrum density of the error signal, the energy of the near-end microphone acquisition signal, the reverberation power spectrum density of a reference signal, and the sound attenuation coefficient of an echo; computing a filter coefficient of frequency-domain Wiener filtering according to the energy of the near-end microphone acquisition signal and the energy of the error signal; computing a filter coefficient of similar Wiener filtering according to the cross-power spectrum density of the error signal and the near-end microphone acquisition signal, the self-power spectrum density of the error signal, the reverberation power spectrum density of the reference signal, and the sound attenuation coefficient of the echo; and filtering the residual echo according to the filter coefficient of frequency-domain Wiener filtering and the filter coefficient of similar Wiener filtering. The method and the device can be suitable for varied application environments and are capable of accurately filtering the residual echo and guaranteeing good voice quality.

Description

technical field [0001] The invention relates to the field of speech echo cancellation, in particular to a residual echo suppression method and device. Background technique [0002] At present, the most widely used algorithm in adaptive echo cancellation (AEC, Acoustic Echo Canceller) processing is normalized least mean square (NLMS, normalized least mean square), which is a compromise in algorithm complexity and convergence speed compared with other algorithms . In the video conference system, due to various factors, such as: background noise, nonlinear distortion of microphone (MIC) and TV, TV delay and TV delay drift, etc., it is impossible to completely cancel the echo only with NLMS , there will be a small amount of residual echo, and sometimes the residual may be relatively large. Therefore, the frequency domain Wiener filtering algorithm based on the least mean square criterion is generally used to suppress the residual echo, which can also effectively suppress the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/02
CPCH04R3/02
Inventor 修平平鄢仁祥曹李军陈卫东
Owner SUZHOU KEDA TECH
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