Line interface with analog echo cancellation

Details Line interface with analog echo cancellation Line interface with analog echo cancellation

2007-05-01

2007-05-01

Tsang, Fan (Department: 2614)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S394000, C379S398000, C379S402000

Reexamination Certificate

active

10946050

ABSTRACT:
A line interface performs echo cancellation without the use of a hybrid filter network and includes a transmit path having a line driver, a single matching network terminating the line, and a single transformer. The transformer uses split windings on both the primary side and the secondary (line) side. Each half of the primary side is tapped to obtain a turns ratio of N1:N2, while each half of the secondary side of the transformer has N windings. The single matching impedance is coupled in parallel between the first winding and the second winding on each half of the primary side. Either the voltage across the matching impedance or the voltage across the receive terminals is bootstrapped to the receive signal through multiple negative feedbacks. The transfer function of the line driver is shaped as a first-order high-pass filter (HPF) to reject any out-of-band noise and distortion components.

REFERENCES:
patent: 3778730 (1973-12-01), Cromwell et al.
patent: 5274704 (1993-12-01), Jakab
patent: 5822426 (1998-10-01), Rasmus et al.
patent: 5877637 (1999-03-01), Trofimenkoff et al.
patent: 5909132 (1999-06-01), Trofimenkoff et al.
patent: 6163579 (2000-12-01), Harrington et al.
patent: 6212263 (2001-04-01), Sun et al.
patent: 6563445 (2003-05-01), Sabouri
patent: 6731166 (2004-05-01), Sabouri et al.
patent: 6774723 (2004-08-01), Sabouri
patent: 6826278 (2004-11-01), Kiykioglu
patent: 6925172 (2005-08-01), Sabouri et al.
patent: 6931122 (2005-08-01), Sabouri et al.
patent: 6999743 (2006-02-01), Sabouri et al.
patent: 7015683 (2006-03-01), Choksi et al.
patent: 7072617 (2006-07-01), Gupta et al.
patent: 2002/0121930 (2002-09-01), Gorcea
patent: 2002/0126835 (2002-09-01), Joffe
patent: 2002/0151280 (2002-10-01), Sabouri et al.
patent: 2002/0176569 (2002-11-01), Casier et al.
patent: 2003/0109239 (2003-06-01), Sabouri et al.
patent: 2003/0174660 (2003-09-01), Blon et al.

Affiliated with

Also associated with

Rating

Line interface with analog echo cancellation does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3768457