Analog echo suppressor

Details Analog echo suppressor Analog echo suppressor

1985-07-01

1988-05-31

Ng, Jin F.

Telephonic communications

Echo cancellation or suppression

379406, H04B 320

Patent

active

047486651

ABSTRACT:
An analog echo suppression circuit is used with a telephony 2-wire circuit to 4-wire circuit interface. The 2-wire circuit carries a first signal and the 4-wire circuit carries a second signal. Each circuit has an input port and an output port. The interface produces an echo signal on the output of the 2-wire circuit when the second signal is received at the input port of the 2-wire circuit. A first communication channel connects the output of the 4-wire circuit to the input of the 2-wire circuit. A second communication channel connects the output of the 2-wire circuit to the input of the 4-wire circuit and series analog switches or transmission gates can interrupt the second channel. A comparator circuit receives the first and second signals from the first and second channels and has first and second outputs. First and second controller devices are operatively connected to the comparator circuit and provide signals such that, if an echo signal is present, the one analog switch interrupts the second channel and another analog switch grounds the input to the 4-wire circuit.

REFERENCES:
patent: 3821494 (1974-06-01), Besseyre
patent: 4012603 (1977-03-01), Araseki et al.
patent: 4028496 (1977-06-01), LeMarche et al.
patent: 4028506 (1977-06-01), Araseki et al.
patent: 4192979 (1980-03-01), Jankowski, Jr.
patent: 4513177 (1985-04-01), Nishino et al.
patent: 4527014 (1985-07-01), Styrna
patent: 4560840 (1985-12-01), Hansen
patent: 4580013 (1986-04-01), Moisin

Affiliated with

Also associated with

Rating

Analog echo suppressor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Analog echo suppressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog echo suppressor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1879413