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A method, device and system for echo cancellation

A technology of echo cancellation and input signal, applied in the field of electronics, can solve the problem of large signal transmission delay and so on

Active Publication Date: 2019-09-17
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an echo cancellation method, device and system, which are used to solve the technical problem of large signal transmission delay existing in the existing echo cancellation scheme

Method used

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  • A method, device and system for echo cancellation
  • A method, device and system for echo cancellation
  • A method, device and system for echo cancellation

Examples

Experimental program
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Effect test

Embodiment 1

[0054] An embodiment of the present invention provides an echo cancellation system, which is used to solve the technical problem of long signal transmission delay time existing in the existing echo cancellation method. refer to figure 1 , the system at least includes a near-end filter bank, a near-end buffer pool, a far-end filter bank, a far-end buffer pool, an adaptive filter bank, and a controller; the controller and the near-end filter bank, The near-end buffer pool, the far-end filter bank, the remote buffer pool, and the adaptive filter bank are respectively connected.

[0055] Wherein, the near-end buffer pool is used to buffer the original near-end input signal collected at the microphone; the far-end buffer pool is used to buffer the original far-end input signal at the speaker; the near-end filter bank is used to obtain the original The near-end inputs the signal and processes it to generate M near-terminal band signals d i (n), and sent to the adaptive filter bank...

Embodiment 2

[0082] Embodiment 2 of the present invention provides an echo cancellation method, which is applied to the adaptive filter bank in Embodiment 1 above. Refer to Figure 4 , the method includes:

[0083] Step 101: Obtain a near-end input signal D(n) and a far-end input signal X(n); wherein, the near-end input signal D(n) includes M near-terminal band signals d i (n), the remote input signal X(n) includes M remote sub-band signals x i (n), n is the sampling moment, i is the sequence number of the subband, i=0,1,...,M-1;

[0084] Step 102: According to the remote input signal x corresponding to each subband i (n) The near-end input signal d corresponding to each sub-band i (n) Perform filtering processing to generate the residual signal e corresponding to each sub-band i (n);

[0085] Step 103: The residual signal e corresponding to all subbands i (n) performing synthesis processing to generate a synthesized residual signal ec(n);

[0086] Step 104: Perform frequency-time c...

Embodiment 3

[0103]Embodiment 3 of the present invention provides an echo canceling device, which is used to implement the echo canceling method described in Embodiment 2 above. Refer to Figure 5 , the device includes:

[0104] An acquisition unit 201, configured to acquire a near-end input signal D(n) and a far-end input signal X(n); wherein, the near-end input signal D(n) includes M near-terminal band signals d i (n), the remote input signal X(n) includes M remote sub-band signals x i (n), n is the sampling moment, i is the sequence number of the subband, i=0,1,...,M-1;

[0105] The processing unit 202 is configured to, according to the remote input signal x corresponding to each subband i (n) The near-end input signal d corresponding to each sub-band i (n) Perform filtering processing to generate the residual signal e corresponding to each sub-band i (n);

[0106] Combining unit 203, configured to combine residual signals e corresponding to all subbands i (n) performing synthesis...

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Abstract

Embodiments of the present invention provide an echo cancellation method, device and system. The method includes: obtaining a near-end input signal and a far-end input signal; respectively performing filtering processing on the near-end input signal corresponding to each sub-band according to the far-end input signal corresponding to each sub-band, and generating a residual signal corresponding to each sub-band; Residual signals corresponding to all sub-bands are synthesized, and frequency-time conversion is performed on the synthesized residual signals to obtain near-end input signals after echo cancellation; wherein, the near-end input signals and the far-end input signals are In the process of processing, according to the set period, the correlation between the near-end input signal and the far-end input signal corresponding to each sub-band is detected, and the near-end input signal and the far-end input signal in all sub-bands are determined in consecutive N cycles. When the sequence numbers of the subbands with the highest correlation of the input signal are all less than K, stop filtering the near-subband signals corresponding to subband K to subband M‑1, where K is less than or equal to M‑1.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to an echo cancellation method, device and system. Background technique [0002] In a voice communication system, echoes are often generated due to the coupling between the loudspeaker and the microphone, that is, when the loudspeaker plays the far-end input signal, a part of the far-end input signal is captured by the near-end microphone and mixed with the near-end input signal. Together, the near-end input signal is echoed. [0003] The main process for the existing echo cancellation system to cancel the echo of the near-end input signal is: to send the far-end input signal sent to the speaker to the adaptive filter bank at the same time, and the adaptive filter bank to the far-end input signal at the speaker. Calculation is performed to simulate the echo signal in the near-end input signal, and then the simulated echo signal is filtered out from the near-end input si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
CPCH04M9/082G10K11/17854G10K2210/108
Inventor 孙智勇陈琦方伟
Owner ZHEJIANG DAHUA TECH CO LTD