Echo suppressor for improving echo canceler performance

Details Echo suppressor for improving echo canceler performance Echo suppressor for improving echo canceler performance

1983-01-27

1985-10-08

Rubinson, Gene Z.

1791706, H04B 320

Patent

active

045462160

ABSTRACT:
An echo suppressor (21, 22) monitors signal levels associated with the working environment of an echo canceler (16, 17) to prevent spurious transient responses from the canceler. These spurious responses typically occur before the echo canceler has had sufficient time to appropriately adapt which is also the time when a call is first established. At such times, signaling and maintenance testing are performed in a telecommunications network and the echo canceler tends to produce an output when there is no actual transmit input signal. The echo suppressor includes a comparator (26, 27) which detects the presence of this output and the absence of an actual transmit input signal and operates a switch. The switch prevents the transient echo from propagating on the transmit path.

REFERENCES:
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 4005277 (1977-01-01), Areski et al.
patent: 4282411 (1981-08-01), Stewart
patent: 4360712 (1982-11-01), Horna

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