Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for canceling echo

An echo cancellation and near-end technology, which is applied in the direction of wired transmission systems, electrical components, transmission systems, etc., can solve problems such as poor echo cancellation effects, and achieve the effect of echo cancellation

Active Publication Date: 2013-10-30
BYD CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is that the echo cancellation effect of the existing adaptive filter echo cancellation device is not good, so for the acoustic echo, an echo cancellation device that can provide less influence from the external environment is proposed

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
  • Device and method for canceling echo
  • Device and method for canceling echo
  • Device and method for canceling echo

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0041] Based on the specific embodiment 1, the echo canceling device of the present invention also provides a second embodiment. image 3 It is the functional block diagram of the second specific embodiment, such as image 3 As shown, this example contains figure 2 All modules, and:

[0042] Signal separation modules include:

[0043] Whitening unit 61: used to form a mixing matrix from the near-end input signals of multiple observation paths, and whiten the mixing matrix to obtain a whitening signal and output it to the calculation unit 62;

[0044] Calculation unit 62: used to receive the whitening signal and Sin sent by the whitening unit 61, and perform iterative calculations according to the whitening signal, and obtain a separation matrix when converging, and the calculation unit 62 calculates each signal source according to Sin and the separation matrix and Output to extraction unit 63;

[0045] Extraction unit 63: used to receive each signal source sent by the calcu...

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 a device for canceling echo, which comprises a near-end cache module, a near-end voice detection module, a far-end voice detection module, a near-end pitch period module, a far-end pitch period module and a signal separation module. The device can analyze independent components according to a near-end input signal, calculates each signal source and a pitch period thereof when the analyzing result of the independent components is converged, compares the pitch period of each signal source with a near-end pitch period and a far-end pitch period to obtain an acoustic echo signal, further obtains the near-end input signal after the echo is cancelled and outputs the near-end input signal to a far end so as to effectively cancel the acoustic echo in real time.

Description

technical field [0001] The invention relates to the field of speech signal processing, in particular to an echo cancellation device and method. Background technique [0002] With the advent of the information age, the communication methods that people increasingly rely on have developed from the early monolingual communication to the direction of multi-service and multi-network integrated communication. In various communication services, where voice playback equipment and voice capture equipment are required to be used at the same time, such as conference calls, video conferences, Internet calls, etc., the echo affects the quality of calls to a certain extent. Echo can be divided into electrical echo and acoustic echo, and the electrical echo is mainly caused by the mismatch of data conversion in the communication system. [0003] The acoustic echo is formed due to the voice coupling between the voice playback device and the voice capture device. Specifically, due to the us...

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 Patents(China)
IPC IPC(8): H04B3/23
Inventor 王进军李智江吴浪浪
Owner BYD CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com