Tandem adaptive echo canceler arrangement

Details Tandem adaptive echo canceler arrangement Tandem adaptive echo canceler arrangement

1983-02-04

1985-11-19

Brown, Thomas W.

1791706, H04B 320

Patent

active

045544174

ABSTRACT:
An extended impulse response characteristic is obtained by switchably connecting (via 13, 14, 15) at least first (10) and second (12) adaptive echo cancelers in a tandem connection (FIG. 1). A delay unit (11) is associated with a receive input (X) of the second adaptive echo canceler (12) so that each filter models a different portion of the extended impulse response characteristic. The relative positions of the adaptive echo cancelers (10, 12) in the tandem connection are controllably switched (via 13, 14, 15 and 16) to insure so-called "good" adaptation of the individual adaptive echo cancelers (10, 12) to minimize misalignment noise. Both adaptive echo cancelers (10, 12) are allowed to adapt initially but upon switching only the adaptive echo canceler (12) in a so-called preferred position in the tandem connection is allowed to adapt while the other adaptive echo canceler (10) is inhibited from further adapting.

REFERENCES:
patent: 3500000 (1970-03-01), Kelly et al.
patent: 3597541 (1971-08-01), Proakis et al.
patent: 3732410 (1973-05-01), Mackechnie
patent: 3787645 (1974-01-01), Ochiai et al.
patent: 3828147 (1974-08-01), Ochiai et al.
patent: 4359778 (1982-11-01), Lee
patent: 4377793 (1983-03-01), Horna
"A High Speed Digital Adaptive Echo Canceler", N. Demytko et al., Australian Telecommunications Research, vol. 7, No. 1, 1973, pp. 20-28.
"Extended Range Echo Cancelers", by O. A. Horna, IEEE Southeastern 1981 Conference Proceedings, pp. 846-853.

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