Recovery of previous filter coefficients with smaller capacity m

Details Recovery of previous filter coefficients with smaller capacity m Recovery of previous filter coefficients with smaller capacity m

1996-04-12

1998-08-18

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379411, 379406, 379392, 370286, 370290, 370291, 370289, 375229, 375232, 375233, 375230, 375231, H04M 100

Patent

active

057968209

ABSTRACT:
The echo canceler includes an N-tap FIR filter and a coefficient controller. Previous filter coefficients which were generated before an estimation error occurrence when the transmitting output signal becomes greater in power than the transmitting input signal are obtained by using only a number S of coefficient correction values and another number (N-1+S) of sequentially received signals. Since the latest (N-1) received signals are stored in (N-1) delay circuits of an N-tap FIR filter, respectively, a relatively small capacity memory may be provided to store the earlier S received signals. The number S is determined so that a time interval determined by the number S of sampling instants is longer than a response time of a double talk detector.

REFERENCES:
patent: 4621173 (1986-11-01), Guidoux
patent: 5467394 (1995-11-01), Walker et al.
patent: 5631900 (1997-05-01), McCaslin et al.

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