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1. (WO2002028075) REMOVING NOISE FEEDBACK IN CONFERENCE CALLS DUE TO ACCOUSTICAL CROSS TALK
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2002/028075    International Application No.:    PCT/SE2001/002099
Publication Date: 04.04.2002 International Filing Date: 27.09.2001
Chapter 2 Demand Filed:    09.04.2002    
IPC:
H04M 3/22 (2006.01), H04M 3/56 (2006.01)
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (publ) [SE/SE]; S-126 25 Stockholm (SE)
Inventors: EKUDDEN, Erik; (SE).
ERIKSSON, Anders; (SE)
Agent: GULLSTRAND, Malin; Ericsson Radio Systems AB Patent Unit Research S-164 80 Stockholm (SE)
Priority Data:
09/675,463 28.09.2000 US
Title (EN) REMOVING NOISE FEEDBACK IN CONFERENCE CALLS DUE TO ACCOUSTICAL CROSS TALK
(FR) SYSTEME, APPAREIL ET PROCEDE D'AMELIORATION DE LA QUALITE VOCALE DANS LES DISPOSITIFS MULTIPARTITE
Abstract: front page image
(EN)Cross talk terms may be removed from speech signals in a multi-party conference system having a plurality of users. In a preferred embodiment of the present invention, an estimator (210, 310) is used to first estimate the respective cross talk terms for each of the said plurality of users. These terms are then multiplied with a filter (230, 330) based on the estimated cross talk terms. Source speech signals are thereby recovered from the plurality of multi-party conference users without the cross talk.
(FR)L'invention vise à retirer les termes de diaphonie des signaux de parole dans un système de conférence multipartite ayant une pluralité d'utilisateurs. Dans un mode de réalisation préféré de la présente invention, on utilise un évaluateur (210, 310) pour tout d'abord évaluer les termes de diaphonie respectifs pour chaque utilisateur. Ces termes sont ensuite multipliés par un filtre (230, 330) sur la base des termes de diaphonie estimés. Les signaux de parole source sont ainsi récupérés à partir de la pluralité des utilisateurs de conférence multipartite sans la diaphonie.
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PH, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)