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Echo cancellation method and device

A technology of echo cancellation and echo, which is applied in the direction of speaker distribution signal, electrical components, signal processing, etc., can solve the problems of poor echo cancellation effect, achieve high accuracy and improve the recognition rate

Active Publication Date: 2020-03-24
HISENSE
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AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides an echo cancellation method and device to solve the problem of poor echo cancellation effect in the prior art

Method used

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Embodiment Construction

[0022] In order to solve the problems existing in the prior art, the present invention provides an echo cancellation method and device, which can obtain the total volume value through the smart TV microphone array, and determine the gain corresponding to the current sound effect mode; obtain the speaker volume value, according to the speaker volume value and The gain estimates the echo value; finally, the echo value is eliminated from the total volume value to achieve the purpose of echo cancellation. Since the present invention can set different gains for different sound effect modes, the accuracy of the echo value estimated in each sound effect mode can be increased, thereby improving the voice wake-up recognition rate.

[0023] Please refer to figure 1 , is a processing flowchart of an echo cancellation method in an exemplary embodiment of the present invention, the method is applied to a smart TV, and the method includes:

[0024] Step 101, obtain the total volume value t...

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Abstract

The invention provides an echo cancellation method and a device, and the method is used for a smart television, and comprises the steps: obtaining a total volume value through a microphone array; determining a gain corresponding to the current sound effect mode; and obtaining a loudspeaker volume value, estimating an echo value according to the loudspeaker volume value and the gain, and finally eliminating the echo value from the total volume value. According to the invention, different gains can be set for different sound effect modes, so that the accuracy of the estimated echo value in eachsound effect mode is higher, and the voice wake-up recognition rate is improved.

Description

technical field [0001] The invention relates to the technical field of TV far-field voice intelligent wake-up and echo cancellation, in particular to an echo cancellation method and device. Background technique [0002] The basic principle of echo cancellation technology is based on the correlation between the loudspeaker signal and the multipath echo generated by it, establishes the speech model of the far-end signal, uses it to estimate the echo, and continuously modifies the coefficient of the filter to make the estimated value closer to the real echo. Then, the estimated value of the echo is subtracted from the input signal of the microphone, so as to achieve the purpose of canceling the echo. One of the key technical indicators of echo cancellation technology is to eliminate more than 60 decibels. However, in TV far-field pickup, the voice signal is attenuating with the increase of distance, and the TV volume needs to increase with the viewing distance, causing the TV ...

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Application Information

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IPC IPC(8): H04R3/12
CPCH04R3/12H04R2430/00
Inventor 张利红
Owner HISENSE