Subsampling delay estimator for an echo canceler

Details Subsampling delay estimator for an echo canceler Subsampling delay estimator for an echo canceler

1983-02-17

1985-12-31

Rubinson, Gene Z.

Pulse or digital communications

Repeaters

Testing

375102, 370 32, 364728, 364824, 324 77H, G04F 1000, H04B 320

Patent

active

045623120

ABSTRACT:
An estimate of delay (.DELTA.) in a communication circuit is obtained by subsampling (via 110-114) signals incoming (X(K)) to and outgoing (Y(K)) from the communication circuit, obtaining a cross correlation (via 120, 121) of the subsampled signals and processing (via 122) the cross correlation in accordance with a prescribed algorithm.
In one application (FIG. 1) the delay estimate (.DELTA.) is used in conjunction with an adjustable delay (101) connected in series with a "short" echo canceler (102) across the communication circuit for cancelling echoes.

REFERENCES:
patent: 3535473 (1970-10-01), Flanagan et al.
patent: 3721777 (1973-03-01), Thomas
patent: 3875500 (1975-04-01), Fletcher et al.
patent: 3906213 (1975-09-01), Meriaux et al.
patent: 4025775 (1977-05-01), Beauvis et al.
patent: 4097801 (1978-06-01), Freeman et al.
patent: 4334128 (1982-06-01), Snijders
patent: 4355214 (1982-10-01), Levy et al.
Preliminary Disclosure, AMI S2816, American Microsystems Incorporated, Jul. 1981.

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