Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2000-02-21
2008-05-06
Orgad, Edan (Department: 2619)
Multiplex communications
Duplex
Transmit/receive interaction control
C375S222000
Reexamination Certificate
active
07369516
ABSTRACT:
A method for transmitting data signals in full duplex with echo cancellation between a first and a second modem connected by a two-wire channel, wherein a data signal is a function of at least one data symbol in a stream of data symbols generated by a modem comprising: determining echo cancellation coefficients for the first modem; transmitting data signals in full duplex between the two modems using the echo cancellation coefficients to cancel echoes in data signals received by the first modem; providing at least one hiatus in data symbol generation by the second modem while continuing data symbol generation by the first modem at a time at which echo cancellation using the echo cancellation coefficients is effective in canceling echoes in data signals received by the first modem; and updating the first modem echo cancellation coefficients during the at least one second modem hiatus.
REFERENCES:
patent: 4481622 (1984-11-01), Cheng et al.
patent: 4663766 (1987-05-01), Bremer
patent: 4674103 (1987-06-01), Chevillat et al.
patent: 4811342 (1989-03-01), Huang
patent: 4905282 (1990-02-01), McGlynn et al.
patent: 5687169 (1997-11-01), Fullerton
patent: 5754589 (1998-05-01), Maitra et al.
patent: 6094422 (2000-07-01), Alelyunas et al.
patent: 6252901 (2001-06-01), Mueller et al.
patent: 6317455 (2001-11-01), Williams et al.
patent: 6577871 (2003-06-01), Budka et al.
patent: 6603745 (2003-08-01), Antonio et al.
patent: 6690666 (2004-02-01), Norrell et al.
patent: 6781965 (2004-08-01), Milosevic et al.
patent: 2002/0131455 (2002-09-01), Cioffi et al.
patent: 2004/0071242 (2004-04-01), Agazzi et al.
patent: 2004/0071243 (2004-04-01), Agazzi et al.
patent: 2004/0091038 (2004-05-01), Agazzi et al.
patent: 2004/0156461 (2004-08-01), Agazzi et al.
patent: 2004/0181738 (2004-09-01), Agazzi et al.
patent: 2005/0157779 (2005-07-01), Hasegawa et al.
patent: 0391715 (1990-10-01), None
patent: 0 513 527 (1992-11-01), None
patent: 0 630 119 (1994-12-01), None
patent: 0806852 (1997-11-01), None
patent: WO0174047 (2001-10-01), None
patent: WO0191371 (2001-11-01), None
Verhoeckx et al,; Digital echo cancellation for baseband data transmission; Acoustics, Speech, and Signal Processing [see also IEEE Transactions on Signal Processing], IEEE Transactions on vol. 27, Issue 6, Dec. 1979 pp. 768-781□□.
Guidoux et al,;Binary Passband Echo Canceller in a 4800 Bit/s Two-Wire Duplex Modem; Selected Areas in Communincations, IEEE Journal on vol. 2, Issue 5, Sep. 1984 pp. 711-721□□.
Weiping Li et al.; Frequency and symbol rate offset compensating algorithms for simultaneous estimation of echo and channel responses; Information Theory, IEEE Transactions on vol. 44, Issue 4, Jul. 1998 pp. 1702-1708.
Quatieri et al.; Decision-directed echo cancellation for full-duplex data transmission at 4800bps; Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86. vol. 11, Apr. 1986 pp. 1337-1340.
“The Theory and Practice of Modem Design;” by John A. C. Bingham; Copyright 1988 by John Wiley and Sons Inc.; pp. 370-373.
Mueller, K. H.; “A New Digital Echo Canceler for Two-Wire Full-DuplexData Transmission;” pp. 956-962;Sep. 1976; IEEE Transactions on Communications; vol. Com-24; No. 9.
Fisher Abraham
Nativ Isaac
Ahmed Salman
Orgad Edan
LandOfFree
Adaptive echo canceling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive echo canceling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive echo canceling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3987231