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Rapid echo cancellation method in intelligent sound box

An echo cancellation, smart speaker technology, applied in speech analysis, frequency response correction, instruments, etc., can solve the problems of high residual echo, distortion of target speech signal, affecting speech intelligibility, etc., to reduce the amount of calculation, suppress echo, The effect of reducing the phenomenon of speech distortion

Active Publication Date: 2020-06-19
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE +1
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Problems solved by technology

However, under the condition of low echo-to-noise ratio, due to the overestimation of the residual echo in beamforming, the target speech signal will be distorted to a certain extent, affecting speech intelligibility

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  • Rapid echo cancellation method in intelligent sound box
  • Rapid echo cancellation method in intelligent sound box
  • Rapid echo cancellation method in intelligent sound box

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Embodiment Construction

[0073] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0074] Such as Figure 1-3 As shown, the fast echo cancellation method in the smart speaker provided by the present invention comprises the following steps:

[0075] Step 1, use the speaker of the sound box to play the sound wave signal, and use a uniform linear array composed of multiple omnidirectional microphones to collect the signal sent by the speaker, and establish an acoustic function model including the voice signal, the background noise of the echo signal and the signal received by the microphone;

[0076] The acoustic function model is:

[0077] Y n (l,k)=D n (l,k)+S n (l,k)+V n (l,k);

[0078] Among them, D n (l,k) represents the echo signal. When the room reverberation is large, the echo signal can be approximated by the convolution transfer function as: ...

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Abstract

The invention discloses a rapid echo cancellation method in an intelligent sound box. The method comprises the following steps: 1, establishing an acoustic function model comprising a voice signal, anecho signal, background noise and a microphone receiving signal; 2, obtaining an acoustic transfer function model of each microphone; 3, obtaining the upper branch voice reference signal of the fixedbeamformer; 4, calculating a first channel echo signal; 5, calculating the relative echo transfer function of the first second echo signal according to the space structure of the microphone array toobtain echo signals of other channels of the microphone array; and 6, constructing a cost function according to the minimum mean square error value between the voice reference signal obtained by fixedbeamforming and the adaptive beamforming noise reference signal to update and iterate a beamformer coefficient. According to the method, echo cancellation is carried out in combination with an adaptive beam forming algorithm, residual echo estimation does not need to be carried out, and small distortion of a target voice signal can be guaranteed while the echo is well suppressed.

Description

technical field [0001] The invention relates to the field of sound box echo processing, in particular to a fast echo cancellation method in an intelligent sound box. Background technique [0002] In recent years, with the continuous development of artificial intelligence technology, voice interaction has become the most convenient and efficient way of human-computer interaction, among which smart speakers are the main daily application objects of people. When the speaker in the smart speaker plays music, it will be collected by the microphone in the smart speaker after being transmitted through the room, which is the echo in the smart speaker. Wake-up and recognition results, so that effective voice control of smart speakers cannot continue. Therefore, it is more and more important to study how to remove the echo in the smart speaker. [0003] In communication, traditional single-channel acoustic echo cancellation mainly adopts adaptive filtering technology. Existing adapt...

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0216H04R3/04
CPCG10L21/0208G10L21/0216H04R3/04G10L2021/02082G10L2021/02166
Inventor 王冬霞张伟周城旭
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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