Half echo-suppressor for a four-wire telephone line

Details Half echo-suppressor for a four-wire telephone line Half echo-suppressor for a four-wire telephone line

1978-09-21

1980-07-15

Konick, Bernard

1791706, H04B 320

Patent

active

042130140

ABSTRACT:
The invention comes within the field of half echo-suppressor for four-wire telephone lines and relates more particularly to the transmitted speech detector, said suppressor comprising an accumulator for accumulating characteristic indices of the samples, to control of the blocking element in the send channel depending on the accumulated value.
In accordance with the invention, there is provided at least one digital comparator with a threshold, which receives the content of the accumulator and whose threshold is fixed between the limits of the accumulator. The blocking element can therefore be controlled with several operation times and via different hold circuits.

REFERENCES:
patent: 3825694 (1974-07-01), Penicaud
patent: 3896273 (1975-07-01), Fariello
patent: 3906172 (1975-09-01), Hoeschele, Jr. et al.
patent: 3937907 (1976-02-01), Campanella et al.
patent: 3985979 (1976-10-01), Durand et al.
patent: 4051332 (1977-09-01), Izumi et al.
patent: 4088851 (1978-05-01), Gupta et al.

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