Half-echo suppressor for a terminal of a four-wire electric line

Details Half-echo suppressor for a terminal of a four-wire electric line Half-echo suppressor for a terminal of a four-wire electric line

1974-12-10

1976-10-12

Claffy, Kathleen H.

1791708, H04B 320

Patent

active

039859797

ABSTRACT:
The invention comes within the field of four-wire telephony. To avoid the closing of a loop between the two unidirectional channels, a half-echo suppressor is provided for each terminal, which comprises mainly a speech detector for the emitting channel, said speech detector having two operational modes: the first sends out a speech indicator signal based on the characteristics of amplitude and sign change on the emitting channel whereas the second compares the amplitude on the emitting channel and the amplitude on the receiving channel and is effective when the receiving channel is active. The invention applies more particularly to a PCM network in combination with a concentrator which uses the inactivity periods of the circuits.

REFERENCES:
patent: 3280274 (1966-10-01), Schoeffler
patent: 3351720 (1967-11-01), Brady
patent: 3673355 (1972-06-01), La Marche et al.
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 3823275 (1974-07-01), La Marche et al.
patent: 3896273 (1975-07-01), Fariello

Affiliated with

Also associated with

Rating

Half-echo suppressor for a terminal of a four-wire electric line does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Half-echo suppressor for a terminal of a four-wire electric line, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Half-echo suppressor for a terminal of a four-wire electric line will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-944163