Method and device for analysis of a return signal and adaptive e

Details Method and device for analysis of a return signal and adaptive e Method and device for analysis of a return signal and adaptive e

1995-01-31

1996-01-09

Hofsass, Jeffery A.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379411, 370 321, H04M 908, H04B 320

Patent

active

054835941

ABSTRACT:
The forward signal is submitted to a finite-impulse-response linear-prediction filter in order to determine a first residual signal of minimal energy. The return signal is submitted to a finite-impulse-response filter the coefficients of which are the same as those of the linear-prediction filter of the forward signal in order to determine a second residual signal. The ratio of the energies contained in the first and second residual signals is calculated. It is determined whether the return signal contains components other than the echo components from the forward signal by comparing the calculated ratio to a detection threshold.

REFERENCES:
patent: 4360712 (1982-11-01), Horna
patent: 4672665 (1987-06-01), Nagai et al.
patent: 4697261 (1987-09-01), Wang et al.
patent: 4712235 (1987-12-01), Jones, Jr.
patent: 4736414 (1988-04-01), Montagna et al.
patent: 4894820 (1990-01-01), Miyamoto et al.
patent: 4918727 (1990-04-01), Rohrs et al.
patent: 5305349 (1994-04-01), Dent
patent: 5307405 (1994-04-01), Sih
patent: 5343521 (1994-08-01), Jullien et al.
IEEE Global Telecommunications Conference, vol. 3, Nov. 1984 "A Fast Adaptive Echo Canceller With Delay Estimation For Time Variant Telephone Circuits"--p. 1569--Montagna et al.
Hayashi et al., "Echo Canceller With Effective Double Talk Control", IEEE Global Telecommunications Conference, vol. 3, pp. 1389-1393, 1983.

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