Multiplex communications – Duplex – Transmit/receive interaction control
Patent
1995-05-31
1997-03-11
Olms, Douglas W.
Multiplex communications
Duplex
Transmit/receive interaction control
379410, H04B 320
Patent
active
056109091
ABSTRACT:
Acoustic echos are canceled by employing a first echo canceler having a comparatively long first impulse response synthesis capability which is connected between a transmit path and receive path for generating a first error signal and for canceling echo signals in the transmit path, and at least a second echo canceler having a comparatively short second impulse response synthesis capability connected in parallel with the first echo canceler between the transmit and the receive path. The second echo canceler is supplied with the first error signal from the first echo canceler and is adaptively operating simultaneously with but independent of the first echo canceler to further cancel echos in the transmit path. Specifically, the first echo canceler is intended to capture the substantially stationary and any slowly varying components of the echo path impulse response, and the second echo canceler is intended to capture the more time varying, i.e., dynamically varying, component of the echo path impulse response.
REFERENCES:
patent: 3500000 (1970-03-01), Kelly et al.
patent: 5353279 (1994-10-01), Koyama
patent: 5396517 (1995-03-01), Yedid et al.
patent: 5463618 (1995-10-01), Furukawa et al.
Lucent Technologies - Inc.
Olms Douglas W.
Stafford Thomas
Ton Dang
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