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Echo detecting method, device thereof and system

An echo and prediction module technology, which is applied in the field of echo detection and echo detection devices, can solve the problems that nonlinear echo components cannot be eliminated, echo cannot be effectively eliminated, etc., so as to improve prediction accuracy, eliminate nonlinear echo components and linear echoes ingredients, the effect of improving call quality

Inactive Publication Date: 2019-01-29
ALIBABA GRP HLDG LTD
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Problems solved by technology

[0004] In the prior art, a fir linear filter can be used for linear echo cancellation, but this filter cannot eliminate nonlinear echo components, resulting in the residual signal output by the linear filter including nonlinear echo components, making the echo unable to be effectively eliminated

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  • Echo detecting method, device thereof and system
  • Echo detecting method, device thereof and system
  • Echo detecting method, device thereof and system

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Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

[0052] refer to figure 1 It shows a schematic diagram of audio signal transmission during a call. When the near-end device plays the far-end audio signal S(n) sent by the far-end device, S(n) first passes through the power amplifier to generate harmonic distortion and produces broken sound through the speaker, thereby A nonlinear echo is generated, and then a linear echo is generated through the attenuation of the sound in the air and the microphone collection. Based on this, the near-end audio signal d(n) finally col...

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Abstract

An embodiment of the invention provides an echo detecting method, a device thereof and a system, wherein the method comprises the steps of receiving a far-end audio signal; performing nonlinear filtering processing on the far-end audio signal, determining a first echo detecting signal which comprises a nonlinear echo predicating signal; performing linear filtering processing on the first echo predicating signal, and obtaining a second echo predicating signal, wherein the second echo predicating signal comprises a nonlinear echo predicating signal and a linear echo predicating signal. The echodetecting method, the device thereof and the system can realize identification of the nonlinear echo component and the linear echo component in an echo signal and improves predication accuracy of theecho signal, thereby effectively eliminating the nonlinear echo component and the linear echo component in the echo signal and improving calling quality.

Description

technical field [0001] The present application relates to the technical field of voice processing, in particular to an echo detection method and an echo detection device. Background technique [0002] During a call, when the near-end device plays the voice signal sent by the far-end device, the microphone in the near-end device will collect the voice signal and send the voice signal to the far-end device, causing the user of the far-end device to hear The echo of the voice signal sent by oneself affects the quality of the call. Therefore, it is necessary to eliminate the echo during the call. [0003] The entire echo link can be divided into linear echo and nonlinear echo. Among them, the linear echo is the attenuation of the sound in the air and the microphone collection; the nonlinear echo is the harmonic distortion of the sound passing through the power amplifier, and the sound breaking through the speaker. [0004] In the prior art, a fir linear filter can be used for l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08
CPCG10L19/26G10L21/0208G10L21/0216G10L2021/02082H04M9/082
Inventor 唐磊
Owner ALIBABA GRP HLDG LTD
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