Differential echo cancellation receiver with dynamic...

Details Differential echo cancellation receiver with dynamic... Differential echo cancellation receiver with dynamic...

2005-12-06

2005-12-06

Harold, Jefferey F. (Department: 2644)

Telephonic communications

Subscriber line or transmission line interface

C379S402000, C379S390040

Reexamination Certificate

active

06973182

ABSTRACT:
Differential echo cancellation receiver circuitry with dynamic cancellation of excess DC output current. Differential input circuitry provides for cancellation of incoming DC voltage and the incoming transmit signal echo while passing the receive signal. Excess DC current appearing in the input circuitry as part of the incoming DC voltage and echo signal cancellation is shunted away from the output circuitry with dynamically biased current shunting circuitry that tracks changes in the DC current within the input circuitry.

REFERENCES:
patent: 6370245 (2002-04-01), White

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