Method and apparatus for outbound wave subtraction using a...

Details Method and apparatus for outbound wave subtraction using a... Method and apparatus for outbound wave subtraction using a...

2006-12-26

2006-12-26

Kuntz, Curtis (Department: 2614)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

Reexamination Certificate

active

07155006

ABSTRACT:
A method and apparatus for outbound wave subtraction using a variable offset amplifier is described. The method includes calibration of a bi-directional signaling circuit in order to calculate one or more offset codes for cancellation of an outbound wave within a bi-directional communications link. Once the one or more offset codes are calculated, it is determined whether a dual inbound wave is received by the bi-directional signaling circuit. Once received, an offset code from the one or more calculated offset codes is selected according to a value of an outbound wave within the dual inbound/outbound wave. Finally, the outbound wave is cancelled from the dual inbound wave at an output of a variable offset amplifier using the selected offset code.

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patent: 6348882 (2002-02-01), Ciccone et al.
patent: 6388521 (2002-05-01), Henry

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