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Processing system, method and device for echo suppression audio signal feature tracking

An audio signal and feature tracking technology, which is applied in speech analysis, instruments, etc., can solve the problems of adaptive filter divergence, reducing the accuracy of adaptive filter tracking echo signal, long silence time, etc.

Active Publication Date: 2021-05-11
SHANGHAI XIAODU TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Muting will affect the characteristics of the adaptive filter to capture the echo signal
Long periods of silence can cause divergence of an adaptive filter that has converged to a steady state of operation
When the next echo comes, the adaptive filter needs to re-converge, resulting in a convergence delay, which reduces the accuracy of the adaptive filter to track the characteristics of the echo signal, and affects the stable working state of the adaptive filter and the performance of echo cancellation.
At the same time, due to the repeated convergence of the adaptive filter, the complexity of the operation is increased

Method used

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  • Processing system, method and device for echo suppression audio signal feature tracking
  • Processing system, method and device for echo suppression audio signal feature tracking
  • Processing system, method and device for echo suppression audio signal feature tracking

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Embodiment 1

[0034] figure 2 It is a schematic structural diagram of a processing system for echo suppression audio signal feature tracking provided by Embodiment 1 of the present invention. This embodiment is applicable to the processing of audio signals, such as figure 2 As shown, the processing system for feature tracking of the echo suppressed audio signal includes: a sound pickup device 201, an audio playback device 202, an echo cancellation device 203, and a processor 204;

[0035] The sound pickup device 201 is used to pick up sound information in the external environment and generate a sound pickup signal;

[0036] Audio playback device 202, used to play the playback signal to the external environment;

[0037] The echo canceling device 203 includes an adaptive filter, configured to eliminate the echo signal in the pickup signal according to the estimated echo signal output by the adaptive filter;

[0038] An adaptive filter is used to update filter parameters in real time acco...

Embodiment 2

[0051] Figure 4 It is a flowchart of a processing method for echo suppression audio signal feature tracking provided by Embodiment 2 of the present invention. This embodiment is applicable to the case of processing audio signals, and this method can be applied to the echo signal provided by the embodiment of the present invention. In processing systems that suppress audio signal feature tracking. Such as Figure 4 As shown, it specifically includes the following steps:

[0052] Step 401 , when it is detected that the audio playback device is switched from the mute state to the working state, acquire filter parameters updated in real time by the adaptive filter.

[0053] Wherein, when the processor detects that the audio playback device is switched from the mute state to the working state, it obtains the filter parameters updated in real time by the adaptive filter. The filter parameters that are updated in real time by the adaptive filter are filter parameters that are alw...

Embodiment 3

[0061] Figure 5 It is a flowchart of a processing method for feature tracking of an echo-suppressed audio signal provided by Embodiment 3 of the present invention. On the basis of the above-mentioned embodiments, this embodiment optimizes the processing method of feature tracking of an echo-suppressed audio signal: except for the steps In addition to 401 and 402, it also includes: during the process of determining that the audio playback device is in a continuous working state, intercepting the playback signal of the audio playback device as a local processing signal according to a set time interval, and obtaining the energy state of the local processing signal; Adapting the filter parameters of the filter under the local processing signal and the energy state of the local processing signal, and updating the candidate filter parameters corresponding to the energy state.

[0062] Such as Figure 5 As shown, the method includes:

[0063] Step 501. During the process of determ...

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Abstract

The embodiment of the invention discloses a processing system, method and device for echo suppression audio signal feature tracking. Wherein, the system includes: a sound pickup device, an audio playback device, an echo cancellation device, and a processor; the sound pickup device generates a pickup signal; the audio playback device plays the playback signal to the external environment; the echo cancellation device eliminates the echo signal according to the estimated The echo signal in the pickup signal; when the processor detects that the audio playback device is switched from the mute state to the working state, it obtains the filter parameters updated in real time by the adaptive filter, and according to the filter parameters updated in real time and at least one set of pre-stored Select filter parameters to determine the current filter parameters of the adaptive filter. The technical solution of the embodiment of the present invention can quickly converge the adaptive filter in the scene where the echo signals are mixed with silence, so that the adaptive filter can re-enter the working stable state as soon as possible, reduce the complexity of the operation, and improve the performance of echo cancellation.

Description

technical field [0001] Embodiments of the present invention relate to audio processing technology, and in particular to a processing system, method and device for echo suppression audio signal feature tracking. Background technique [0002] When using an electronic device (such as a mobile phone, a conference phone or a video call terminal) to make a call, an acoustic echo phenomenon often occurs. This phenomenon is due to the fact that the sound sent by the speaker of the electronic device is transmitted through the outside world (such as air, solid vibration of the local device, external wall reflection, etc.), and then picked up by the microphone. Such signals are called acoustic echoes. During the call, the user of the device is also sending normal voice to the microphone, and the voice signal acquired by the microphone will be a mixed signal composed of normal voice and echo. The echo phenomenon will inevitably affect the call quality, so it needs to be eliminated. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0208G10L21/0232
CPCG10L21/0208G10L21/0232G10L2021/02082
Inventor 李伟南邓滨宋晨枫
Owner SHANGHAI XIAODU TECHNOLOGY CO LTD