Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Adaptive echo cancellation method

An echo cancellation and self-adaptive technology, applied in two-way sound reinforcement telephone systems, speech analysis, instruments, etc., can solve the problems of not being able to ensure the accuracy of echo cancellation, and adjusting the adaptive step factor in real time without echo intensity

Active Publication Date: 2017-08-18
CHONGQING UNIV OF EDUCATION
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem with the existing solution is that: on the one hand, the updating of the adaptive filter coefficients is not related to the filtering effect (residual signal), and the adaptive step factor is not adjusted in real time according to the echo intensity, which cannot be well guaranteed in various The Accuracy of Echo Cancellation in the Voice State

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Adaptive echo cancellation method
  • Adaptive echo cancellation method
  • Adaptive echo cancellation method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0037] This embodiment is a preferred implementation manner of the adaptive echo cancellation method of the present invention.

[0038] see figure 1 , the flow of the adaptive echo cancellation method in this embodiment is as follows figure 1 shown, including:

[0039] S1. Estimating the echo signal y(k) through an adaptive filter according to the reference signal x(k) of the pronunciation unit;

[0040] As a preferred implementation of this embodiment, this step may also include:

[0041] S101. Convert the reference signal x(k) of the speaker unit into a frequency domain reference signal X(f).

[0042] X(f)=FFT[x(k-M),...,x(k),...,x(k+M-1)]

[0043] S102. Estimating the frequency-domain echo signal Y(f),

[0044] Among them, W(f) is the current adaptive filter coefficient;

[0045] S103. Obtain the y(k) according to the Y(f):

[0046] y(k)=IFFT[Y(f)]

[0047] Wherein, the FFT is a Fourier transform, and the IFFT is an inverse Fourier transform;

[0048] In this exa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an adaptive echo cancellation method comprising the steps of estimating an echo signal y(k) by an adaptive filter according to a reference signal x(k) of a sound emitting unit; computing a residual signal e(k) according to y(k) and a signal d(k) collected by a microphone; computing a power spectrum xPow(f) of a frequency domain reference signal X(f); computing a power spectrum ePow(f) of a frequency domain residual signal E(f); computing a related power spectrum xePow(f) of a conjugate residual signal E*(f) of E(f) and X(f); computing a related coefficient cohxe(f) of X(f) and E*(f); and using cohxe(f) as an adaptive step length factor of the adaptive filter to update an adaptive filter coefficient. According to the technical scheme of the method provided by the invention, the related coefficient between the residual signal and the reference signal is used as the adaptive step length factor, and thus effective echo cancellation can be performed on each voice state.

Description

technical field [0001] The invention relates to the echo processing technology in the process of real-time voice communication and human-computer interaction, in particular to an adaptive echo cancellation method. Background technique [0002] In the process of real-time voice communication, the sound from the speaker of the communication terminal will always be picked up by the microphone of the terminal. If it is sent out without processing, the other party can always hear his own voice; The sound emitted is picked up by the microphone, and the voice of the controller is picked up at the same time. If the voice from the interactive terminal is not eliminated in the signal picked up by the microphone, the interactive terminal will introduce strong interference when recognizing the voice of the controller, reducing the The success rate of recognition is reduced, which eventually causes difficulty in interaction. [0003] Aiming at the problem of echo interference in the pro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08G10L21/0264G10L21/0232
Inventor 付仕明韦鹏程刘芬程雪峰付红王洋吴广富蒋文豪
Owner CHONGQING UNIV OF EDUCATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com