Echo Cancellation Method and Device for Reducing Influence of Cavity Resonance

A technology of echo cancellation and cavity, which is applied in the direction of two-way sound reinforcement telephone system, etc., and can solve the problem that the adaptive filter is difficult to track and converge correctly

Active Publication Date: 2018-03-06
ZHUHAI JIELI TECH
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Problems solved by technology

[0003] Based on this, it is necessary to solve the problem that the adaptive filter in the echo cancellation method in the traditional technology is difficult to track and converge correctly, and provide a new method that can quickly converge the adaptive filter with a general length in the prior art and reduce the influence of cavity resonance. Echo cancellation method and device for

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  • Echo Cancellation Method and Device for Reducing Influence of Cavity Resonance

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[0058] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation of the echo cancellation method and device for reducing the influence of cavity resonance of the present invention will be described below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0059] An echo cancellation method that reduces the influence of cavity resonance in an embodiment of the present invention, such as figure 1 shown, including the following steps:

[0060] S100, collect the output signal u sent to the speaker.

[0061] S200. Collect an input signal d input by a microphone corresponding to the output signal u.

[0062] It should be noted here that there is no strict sequence between step S100 and step S200 , and the sampling chip can be used to sample the signal sent to the loudsp...

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Abstract

The invention discloses an echo elimination method and device for reducing the influence of cavity resonance. Wherein, the method includes the following steps: collecting the output signal sent to the loudspeaker and the input signal input by the microphone; respectively calculating the output spectrum and output power spectrum of the output signal, and the input spectrum and input power spectrum of the input signal; calculating the determined Within the scope of the resonance area, the power ratio of the input power spectrum and the output power spectrum at the corresponding frequency; according to the power ratio, the resonance area corresponding to the input spectrum is corrected to obtain the corrected input spectrum; the corrected input spectrum is time-domain transformed to obtain the corrected input signal ; Subtracting the modified input signal from the echo prediction signal obtained by the adaptive filter based on the output signal of the loudspeaker to obtain the output signal of the echo cancellation output signal. It can make the adaptive filter of general length converge accurately, and can effectively guarantee the elimination of echo without increasing the length of the adaptive filter and thus not increasing the cost.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to an echo cancellation method and device for reducing the influence of cavity resonance. Background technique [0002] The echo in the hands-free equipment seriously affects the call quality, so echo cancellation is very important in the hands-free equipment system. However, in some hands-free devices, such as Bluetooth speakers, if the cavity near the microphone is not designed as an independent cavity and separated from the resonance cavity of the speaker, or the space of the microphone cavity is too large, it is easy to cause the sound collected by the microphone to resonate, and The formant frequency is in the speech frequency region, and the resonance strength is too strong, so that the adaptive filter with a general length cannot track and converge correctly. As a result, the echo cancellation fails, which seriously affects the call quality. A more complex iterativ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
Inventor 肖全之黄荣均方桂平闫玉凤
Owner ZHUHAI JIELI TECH
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