Telephonic communications – Echo cancellation or suppression
Reexamination Certificate
2005-12-20
2005-12-20
Swerdlow, Daniel (Department: 2646)
Telephonic communications
Echo cancellation or suppression
C710S305000, C326S086000
Reexamination Certificate
active
06978012
ABSTRACT:
An echo cancellation circuit includes a variable offset comparator whose input is coupled to receive a transmission line analog signal level. The comparator has a substantially variable offset that is digitally controllable to represent an implied, variable reference level. An output of the comparator provides a value that represents a comparison between the analog transmission line signal level and the implied, variable reference level.
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T. C. Lee and B. Razavi, “A 125-MHz mixed-signal echo canceller for gigabit ethernet on copper wire,” IEEE J. Solid-State Circuits, vol. 36, pp. 366-373, Mar. 2001.
William J. Dally & John W. Poultom, Digital Systems Engineering, Cambridge University Press, 1998, pp. 313-330 and 366-371.
Intel Corporation
Swerdlow Daniel
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