Echo cancelling using adaptive bulk delay and filter

Details Echo cancelling using adaptive bulk delay and filter Echo cancelling using adaptive bulk delay and filter

1982-07-29

1986-04-15

Rubinson, Gene Z.

1791706, H04B 320

Patent

active

045829632

ABSTRACT:
Telephone circuit echo cancelling is disclosed of the type employing a digital transversal filter which adapts to incorporate the impulse response of the echo producing system in such a way as to cancel the echo. Such impulse responses often include large initial periods of substantially zero response due to transmission delays; the echo cancelling of the invention does not attempt to provide filter coefficients and delays for this initial period. Instead, a bulk delay memory holds signal samples for this initial period and then provides them to the transversal filter input. A method is disclosed for automatically selecting the value of the bulk delay based on input and output signals of the system.

REFERENCES:
patent: 3535473 (1970-10-01), Flanagan et al.
patent: 3721777 (1973-03-01), Thomas
patent: 4024357 (1977-05-01), Sourgens et al.
patent: 4464545 (1984-08-01), Werner
Preliminary Spec. Sheet for S2816, American Microsystems Inc., Jul. 1981.

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