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1. WO2000039991 - METHODS AND APPARATUS FOR ADAPTIVE SIGNAL GAIN CONTROL IN COMMUNICATIONS SYSTEMS

Publication Number WO/2000/039991
Publication Date 06.07.2000
International Application No. PCT/SE1999/002288
International Filing Date 07.12.1999
Chapter 2 Demand Filed 21.06.2000
IPC
H04M 9/08 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
9Arrangements for interconnection not involving centralised switching
08Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.  for suppressing echoes for one or both directions of traffic
CPC
H04M 9/08
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
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
  • TELEFONAKTIEBOLAGET LM ERICSSON (publ) [SE/SE]; S-126 25 Stockholm, SE
Inventors
  • SÖRQVIST, Patrik; SE
  • SVENSSON, Tomas; SE
  • SUNDQVIST, Jim; SE
  • ERIKSSON, Anders; SE
Agents
  • ALBIHNS STOCKHOLM AB; P.O. Box 5581 S-114 85 Stockholm, SE
Priority Data
09/219,51723.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHODS AND APPARATUS FOR ADAPTIVE SIGNAL GAIN CONTROL IN COMMUNICATIONS SYSTEMS
(FR) PROCEDES ET APPAREILS DE COMMANDE ADAPTATIVE DE GAIN DE SIGNAUX DANS DES SYSTEMES DE COMMUNICATION
Abstract
(EN)
Adaptive gain control techniques provide correctly adjusted audio signal levels during the entirety of an Internet telephony conversation and are resilient to background noise and loudspeaker echo. Disclosed techniques can account for multiple near-end speakers, as well as changes in near-end environment. In an exemplary embodiment, an adaptive gain controller includes a gain control processor configured to adjust an analog gain for a microphone output signal based on measurements of the microphone output signal and on measurements of a loudspeaker input signal.
(FR)
Des techniques de commande adaptative de gain permettent d'obtenir des niveaux de signaux correctement ajustés pendant toute la durée d'une conversation téléphonique Internet et sont résistants aux bruits de fond et aux échos de hauts-parleurs. Ces techniques permettent de multiples locuteurs de l'extrémité rapprochée comme des changements dans l'environnement de l'extrémité rapprochée. Dans un mode de réalisation, une commande adaptative de gain comprend un processeur de commande de gain conçu pour ajuster un gain analogue d'un signal de sortie de microphone basé sur des mesures du signal de sortie de microphone et sur des mesures d'un signal d'entrée de haut-parleur.
Latest bibliographic data on file with the International Bureau