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Frequency Domain Echo Cancellation Method Based on Channel Aggregation Degree

A technology of echo cancellation and aggregation, which is applied in two-way sound reinforcement telephone systems, voice analysis, instruments, etc., can solve the problems of affecting the quality of voice communication, poor effect, and destroying the target voice spectrum structure.

Active Publication Date: 2019-11-12
深圳市雅今智慧科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The traditional echo cancellation technology does not work well in the application scenario where both ends are emitting voice at the same time (that is, the Double-Talk problem), which will cause serious distortion of the target voice
If the Double-Talk time period is not detected in time, it will destroy the target voice spectrum structure and seriously affect the quality of voice communication

Method used

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  • Frequency Domain Echo Cancellation Method Based on Channel Aggregation Degree
  • Frequency Domain Echo Cancellation Method Based on Channel Aggregation Degree
  • Frequency Domain Echo Cancellation Method Based on Channel Aggregation Degree

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Embodiment Construction

[0143] The echo cancellation processing flow of the present invention mainly includes three core steps, specifically:

[0144] Step 1. Evaluation of the aggregation degree of the microphone channel;

[0145] Set a total of M speaker reference signals and N near-field microphone signals. The reference signals of M-way loudspeakers are sent by the same point source signal in the far field, denoted as r 1 (t), r 2 (t),...,r M (t). The signal collected by N microphones is denoted as y 1 (t),y 2 (t),...,y N (t), which can be expressed as:

[0146]

[0147] In formula (1), m represents the index of the reference signal, and its value ranges from 1 to M; h i,m (t) represents the room impulse response from speaker m to microphone i, g i (t) represents the room impulse response of the target speech to microphone i, s(t) represents the unknown target speech signal, u i (t) represents system white noise and environmental noise, and "*" represents convolution operation.

[0...

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Abstract

The invention discloses a frequency domain echo eliminating method based on a channel aggregation degree. The frequency domain echo eliminating method comprises a step 1: microphone channel aggregation degree estimation and redundant information elimination; a step 2: echo response function estimation and echo elimination; a step 3, system noise elimination and target voice enhancement. The frequency domain echo eliminating method is advantageous in that by adopting a frequency domain filter, the frequency domain echo eliminating method is suitable for a long reverberation condition, and echo residual energy is low, and voice distortion is small; multi-channel echoes and system steady noises are inhibited at the same time, and voice communication quality is higher; a voice distortion inhibiting module is additionally provided, and is used to process an application scene where speakers of both ends speak at the same time, and therefore voice purity is higher.

Description

technical field [0001] The invention relates to the field of voice signal processing, in particular to a frequency-domain echo cancellation method based on channel aggregation degree. Background technique [0002] For echo cancellation: [0003] The so-called echo refers to any terminal device with a built-in microphone and speaker. The microphone will also receive the sound from the speaker while collecting the voice of the target user. For voice communication equipment, if the echo is not eliminated, it will iterate multiple times in the communication loop and form howling, making the communication equipment unusable. For applications such as smart speakers with built-in voice control centers, if the echo is not suppressed, it will affect the accuracy of voice recognition and reduce the intelligence level of voice control. [0004] In principle, echo cancellation can be regarded as a special noise suppression technology, and its particularity is reflected in the fact tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0232H04M9/08
CPCG10L21/0232H04M9/08
Inventor 蔡钢林
Owner 深圳市雅今智慧科技有限公司
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