Double-talk detection in an echo canceller

Details Double-talk detection in an echo canceller Double-talk detection in an echo canceller

1988-03-21

1990-01-16

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

048948209

ABSTRACT:
In a method and apparatus for double-talk detection in an echo canceller that uses an adaptive digital filter to estimate, from a received signal and a transmitted signal to which an echo signal of the received signal is added, the characteristics of an echo path and generate a simulated echo signal, and subtracts this echo replica from the transmitted signal in order to transmit a residual signal from which the echo signal has been removed, and which during the course of this operation detects the double-talk state according to a double-talk detection threshold and inhibits the estimation of adaptive digital filter; adaptive estimation and the double-talk detection threshold are controlled in accordance with the state of system e.g., whether it is in the single-talk state, whether the echo signal is active or idle, whether there are fluctuations in the echo path, or whether howling is taking place.

REFERENCES:
patent: 3499999 (1970-03-01), Sondhi
patent: 3699271 (1972-10-01), Berkley et al.
patent: 4426729 (1984-01-01), Gritton
patent: 4626825 (1986-12-01), Burleson et al.
patent: 4712235 (1987-12-01), Jones, Jr.
Hayashi et al., "Echo Canceller With Double Talk Controller", 1983, IEEE, Global com. 1983, Session 40.6, pp. 1389-1393.
"Applications of Digital Signal Processing", IECE of Japan, Third Edition, Jul. 10th, 1983, pp. 212-221.

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