Echo canceller with relative feedback control

Details Echo canceller with relative feedback control Echo canceller with relative feedback control

1987-06-23

1989-07-04

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, 370 321, H04B 323

Patent

active

048457469

ABSTRACT:
A method for selecting feedback constants for two echo cancellers in an adaptive 2-wire to 2-wire repeater. The repeater is connected to two networks and when signals are received from both networks, the signal having the greater energy level is identified. A feedback constant of the echo canceller associated with the greater signal is set independent of the feedback constant of the other echo canceller. The feedback constant of the other echo canceller is set as a function of a ratio of the signal energy level of a lesser of to larger of the two signals received from the networks.

REFERENCES:
patent: 3922505 (1975-11-01), Hoge
patent: 4591669 (1986-05-01), Duttweiler et al.
"High Attenuation Digital Echo Suppressor", R. Lenoir, IBM Technical Disclosure Bulletin, vol. 20, No. 4, Sep. 1977.

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