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1. WO2019056372 - AN ADAPTIVE FILTER

Publication Number WO/2019/056372
Publication Date 28.03.2019
International Application No. PCT/CN2017/103183
International Filing Date 25.09.2017
IPC
H03H 21/00 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
21Adaptive networks
H04B 3/23 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
3Line transmission systems
02Details
20Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
23using a replica of transmitted signal in the time domain, e.g. echo cancellers
CPC
H04B 3/235
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
3Line transmission systems
02Details
20Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
23using a replica of transmitted signal in the time domain, e.g. echo cancellers
235combined with adaptive equaliser
H04M 9/082
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
9Interconnection arrangements not involving centralised switching
08Two-way loud-speaking telephone systems with means for suppressing echoes or otherwise conditioning for one or other direction of traffic
082using echo cancellers
Applicants
  • GLOBAL SILICON LIMITED [CN]/[CN]
Inventors
  • COLMER, Morgan James
Agents
  • HENSEN INTELLECTUAL PROPERTY FIRM
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AN ADAPTIVE FILTER
(FR) FILTRE ADAPTATIF
Abstract
(EN)
The invention provides a method of processing signals by an adaptive filter. The method includes the steps of determining a direct path distance d between a speaker and a microphone. Based on said determined direct path distance d, a number of taps of the adaptive filter having a zero-valued coefficient is calculated. Input signals to the adaptive filter are then processed adaptively on all remaining taps of the adaptive filter not having a zero-valued coefficient. The adaptive filter can be utilized in an AEC system which dynamically adapts to changes in the direct path distance d.
(FR)
L'invention concerne un procédé de traitement de signaux par un filtre adaptatif. Le procédé comprend les étapes consistant à déterminer une distance de trajet direct d'entre un haut-parleur et un microphone. Sur la base de ladite distance de trajet direct d ) déterminée, un nombre de prises du filtre adaptatif présentant un coefficient de valeur nulle est calculé. Des signaux d'entrée au filtre adaptatif sont ensuite traités de manière adaptative sur toutes les prises restantes du filtre adaptatif ne présentant pas un coefficient à valeur nulle. Le filtre adaptatif peut être utilisé dans un système AEC qui s'adapte de façon dynamique aux changements de la distance de trajet direct d .
Also published as
Latest bibliographic data on file with the International Bureau