Process and system for improving echo cancellation within a tran

Details Process and system for improving echo cancellation within a tran Process and system for improving echo cancellation within a tran

1986-04-28

1988-06-14

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04B 323

Patent

active

047517301

ABSTRACT:
This process enables cancelling residual echo signals in a transmission system wherein echo signals are partially cancelled through use of a filter generating an echo replica, and substracting said replica from the signal in the echo path. The process involves measuring energies of incoming and outgoing signals, comparing the ratio of said energies to a predetermined threshold value to generate a flag information, which flag is used to control a switch on the echo path. The threshold is determined, for instance by using the information provided by the echo path impulse response not considered for the generation of the echo replica.

REFERENCES:
patent: 3721777 (1973-03-01), Thomas
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 4005277 (1977-01-01), Araseki et al.
patent: 4282411 (1981-08-01), Stewart
patent: 4360712 (1982-11-01), Horna
patent: 4467146 (1984-08-01), Lassaux
patent: 4527020 (1985-07-01), Ito
patent: 4546216 (1985-10-01), Tegethoff

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