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1. (WO2007003579) DEVICE FOR CANCELLING ELECTRIC OR ACOUSTIC ECHO, CORRESPONDING METHOD AND COMPUTER PROGRAMME
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/003579 International Application No.: PCT/EP2006/063697
Publication Date: 11.01.2007 International Filing Date: 29.06.2006
IPC:
H04B 3/23 (2006.01) ,H04M 9/08 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
3
Line transmission systems
02
Details
20
Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
23
using a replica of transmitted signal in the time domain, e.g. echo cancellers
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
M
TELEPHONIC COMMUNICATION
9
Arrangements for interconnection not involving centralised switching
08
Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Applicants:
FRANCE TELECOM [FR/FR]; 6, place d'Alleray F-75015 Paris, FR (AllExceptUS)
LE TOURNEUR, Grégoire [FR/FR]; FR (UsOnly)
DELEAM, David [FR/FR]; FR (UsOnly)
Inventors:
LE TOURNEUR, Grégoire; FR
DELEAM, David; FR
Agent:
BIORET, Ludovic; 16B, rue de Jouanet BP 90333 F-35703 Rennes Cedex 7, FR
Priority Data:
05/0709501.07.2005FR
Title (EN) DEVICE FOR CANCELLING ELECTRIC OR ACOUSTIC ECHO, CORRESPONDING METHOD AND COMPUTER PROGRAMME
(FR) DISPOSITIF D'ANNULATION D'UN ÉCHO ÉLECTRIQUE OU ACOUSTIQUE, PROCÉDÉ ET PROGRAMME D'ORDINATEUR CORRESPONDANTS
Abstract:
(EN) The invention concerns a device for cancelling an echo present in a return channel (14), and corresponding to a direct channel (11) of an audio communication system, comprising echo processing means including means (16) for adaptive filtering of the direct channel, delivering an estimation of the echo to be subtracted from the return channel (14). The invention is characterized in that said device comprises means for controlling (26) the processing means taking into account a comparison between a first information representing the energy in output of the processing means and a second information representing the energy of the return channel (14).
(FR) L'invention concerne un dispositif d'annulation d'un écho présent dans une voie de retour (14), et correspondant à une voie directe (11) d'un système de communication audio, comprenant des moyens de traitement d'écho comprenant des moyens de filtrage adaptatif (16) de la voie directe, délivrant une estimation de l'écho destinée à être soustraite à la voie de retour (14). Selon l'invention, un tel dispositif comprend des moyens de contrôle (26) des moyens de traitement tenant compte d'une comparaison entre une première information représentative de l'énergie en sortie des moyens de traitement et une seconde information représentative de l'énergie de la voie de retour (14).
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: French (FR)
Filing Language: French (FR)