Echo canceller using an echo path status detection

Details Echo canceller using an echo path status detection Echo canceller using an echo path status detection

1987-06-04

1989-07-25

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379407, H04B 320

Patent

active

048521612

ABSTRACT:
In an echo canceller system of the type comprising a circuit for measuring the characteristic of an echo path in accordance with input/output signals of the echo path and cancelling from an actual echo signal an approximate echo path signal synthesized in accordance with the echo characteristic, a level measuring circuit for measuring the level of the residual signal, a residual echo level estimating means for estimating the residual echo level based on the output of the level measuring circuit, and a comparator comparing the output of the residual echo level estimating means with the output of the residual echo level measuring circuit, the output of the comparator controlling the measuring operation of the echo path, there are provided a residual signal level measuring circuit including the residual signal level measuring circuit, a transmitted signal input level measuring circuit, and a detector for detecting an opened state of the echo path and producing an output which controls the residual signal level measuring unit.

REFERENCES:
patent: 3836734 (1974-09-01), Campanella et al.
patent: 4129753 (1978-12-01), Duttweiler
patent: 4282411 (1981-08-01), Stewart
patent: 4360712 (1982-11-01), Horna
patent: 4546216 (1985-10-01), Tegethoff

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