Echo eliminating method, device and system

A technology of echo cancellation and input signal, which is applied in the electronic field and can solve problems such as large signal transmission delay

Active Publication Date: 2018-04-06
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides an echo cancellation method, device and system, which are used to solv

Method used

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  • Echo eliminating method, device and system
  • Echo eliminating method, device and system
  • Echo eliminating method, device and system

Examples

Experimental program
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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 invention provide an echo eliminating method, device and system. The method comprises steps of acquiring near-end input signals and far-end input signals; filtering the near-end input signals corresponding to all sub-bands according to the far-end input signals corresponding to all sub-bands, and generating residual signals corresponding to all sub-bands; combining the residualsignals corresponding to all sub-bands, performing frequency-to-time conversion on the combined residual signal, so as to acquire a near-end input signal with echo eliminated, wherein when the near-end input signals and the far-end input signals are processed, association of the near-end input signals and the far-end input signals corresponding to all sub-bands is detected according to a set period, when it is determined that sequence numbers of sub-bands with highest association of the near-end input signals and far-end input signals in all the sub-bands are less than K in N consecutive periods, near-end sub-band signals corresponding to sub-band K to sub-band M-1 are stopped filtering, wherein 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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IPC IPC(8): H04M9/08
CPCH04M9/082G10K2210/108G10K11/17854
Inventor 孙智勇陈琦方伟
Owner ZHEJIANG DAHUA TECH CO LTD
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