Echo canceling arrangement

Details Echo canceling arrangement Echo canceling arrangement

2004-04-09

2010-11-23

Jamal, Alexander (Department: 2614)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S394000

Reexamination Certificate

active

07839993

ABSTRACT:
In a line driver/receiver circuit where the line driver is connected with its output terminals to a load for supplying a transmit signal thereto and where the receiver is connected with its input terminals to the load for simultaneously receiving a receive signal therefrom, the transmit signal on the input terminals of the receiver is canceled by connecting the output terminals of the line driver to the load via equal complex sense impedances of an impedance value that is much smaller than the impedance value of the load impedance to match the load impedance, connecting the input terminals of the receiver to the load via equal first resistors and to respective output terminal of the line driver via equal second resistors, and providing transconductance amplifiers to sense the voltage across the sense impedances and supply corresponding currents to respective input terminal of the line driver.

REFERENCES:
patent: 3904838 (1975-09-01), Stewart
patent: 5448182 (1995-09-01), Countryman et al.
patent: 6295343 (2001-09-01), Hjartarson et al.
patent: 2003/0031139 (2003-02-01), Thilenius
patent: 2005/0286710 (2005-12-01), Barkaro et al.
patent: 0 323 586 (1988-12-01), None
patent: 1 187 411 (2002-03-01), None
patent: 1 195 913 (2002-04-01), None
patent: WO 99/50970 (1999-10-01), None

Affiliated with

Also associated with

Rating

Echo canceling arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4167135