Echo prevention circuit having adaptive digital filter

Details Echo prevention circuit having adaptive digital filter Echo prevention circuit having adaptive digital filter

2006-03-22

2011-10-11

Briney, III, Walter F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

C381S074000

Reexamination Certificate

active

08036376

ABSTRACT:
An echo prevention circuit comprises a first and second FIR filters into which a first input signal is input through an input terminal; an input/output terminal to which an output signal of the first FIR filter is output and the output signal reflected is input or a second input signal is input; a first subtracter that subtracts an output signal of the second FIR filter from a combined signal of the output signal of the first FIR filter and the second input signal; an adaptive digital filter into which the output signal of the first FIR filter is input; a second subtracter that subtracts the output of the adaptive digital filter from the output of the first subtracter. The adaptive digital filter has such filter coefficients that based on the output of the second subtracter, the output signal from the output terminal is the output from the first subtracter that has had the other than the second input signal removed.

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patent: 2007/0133442 (2007-06-01), Masuda et al.
patent: 58-060835 (1983-04-01), None
patent: 2001-060895 (2001-03-01), None
Alan v. Oppenheim et al., Discrete-Time Signal Processing (Second Edition, 1999).
Isshiki & Co., Office Action dated Jan. 25, 2011 for Application No. JP 2006-009065, (5 pages).

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