Nonlinear echo compensator for class B transmitter line driver

Details Nonlinear echo compensator for class B transmitter line driver Nonlinear echo compensator for class B transmitter line driver

2002-07-03

2008-08-05

Kuntz, Curtis (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406060

Reexamination Certificate

active

07409057

ABSTRACT:
A nonlinear echo compensator compensates for nonlinear echo in a transceiver including a transmitter line driver with current cells that are operated in a Class B operating mode. A mapping circuit generates a pattern dependent driving signal. A coefficient generator generates a compensator coefficient. A canceling circuit communicates with the mapping circuit and the coefficient generator and compensates for nonlinear echo in a received signal based on the pattern dependent driving signal and the compensator coefficient.

REFERENCES:
patent: 3647992 (1972-03-01), Thomas
U.S. Appl. No. 09/920,240, filed Aug. 1, 2001, Roo et al.
U.S. Appl. No. 09/465,228, filed Dec. 17, 1999, Kim.
IEEE std. 802.3ab—1999,Sponsor LAN MAN Standards Committee of IEEE Computer Society, “Supplement to Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications—Physical Layer Parameters and Specifications for 1000Mb/s Operation Over 4-Pair of Category 5 Balanced Copper Cabling, Type 1000BaseT.”

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