H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2041079
PHN 13.311 18-10-1990 ABSTRACT Digital echo canceller comprising a double-talk detector. A digital echo canceller has a receive path (2) and a send path (3) and comprises combining means (10) for forming a send output signal [r(k)] as the difference between the signal [z(k)] applied to the send input (SI) and a replica signal [ê(t)] used for cancelling an additive echo signal [e(k)] at the send input (SI) that has developed in response to a receive input signal [x(k)] applied to the receive input (RI), which echo canceller at least includes transforming means (13,15) for transforming the receive input signal [x(k)] and the send output signal [r(k)]; transforming means (14) for transforming the replica signal [ê(k)]; a digital adaptive filter (9) which has a number of filter coefficients for generating the replica signal [ê(t)] in response to the receive input signal [x(k)] and the send output signal [r(k)], adaptation means (12) for determining for each block m, adaptation components [A(p;m)] for each of the filter coefficients [W(p;m)] in response to the receive input signal [x(k)] and the send output signal [r(k)]; controllable gate means (17) for selectively passing the adaptation components [A(p;m)] to the adaptive digital filter (9); control means (25-18, 21-24, 16) for determining respective levels of the send output signAl [r(k)] and the receive input signal [x(k)] and for generating a control signal for the gate means (17) in response to the levels thus determined, which control signals depend in a predetermined manner on the difference between the levels concerned. The control means (21-28, 16) and gate means (17) operate in the frequency-domain if the transforming means (13, 15, 14) perform an N'- point DOT or N'-point IDOT of each block m of N' points and determine fvr each of the N' frequency-domain points a separate control signal in dependence on the respective levels of the receive input signal [x(k)] and the send output signal [r(k)] for the frequency- domain point concerned. [Fig. 3]
Gerwen Petrus J. Van
Kotmans Hendrik J.
Van de Laar Franciscus A. M.
Fetherstonhaugh & Co.
Gerwen Petrus J. Van
Kotmans Hendrik J.
N.v. Philips Gloeilampenfabrieken
Van de Laar Franciscus A. M.
LandOfFree
Digital echo canceller comprising a double-talk detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital echo canceller comprising a double-talk detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital echo canceller comprising a double-talk detector will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1796884