Transceiver

Details Transceiver Transceiver

2005-03-22

2005-03-22

Harvey, Minsun Oh (Department: 2681)

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

C379S093090

Reexamination Certificate

active

06870911

ABSTRACT:
Transceiver for transmitting and receiving voice and data signals includes a voice signal driver configured to operate in idle or working operating modes, during which it has a high or low output impedances respectively. A data signal driver drives an analog data transmission signal via a channel to the subscriber. A data reception circuit that converts a received analog data reception signal into digital reception data includes a multiplication circuit for multiplying the digital reception data by compensation coefficients selected to compensate for channel distortions, an identification circuit connected to the channel for providing an identification signal indicative of whether the subscriber terminal is on or off-hook, and a control circuit to select the operating mode in response to the identification signal and to determine compensation coefficients to compensate for a change in the channel resulting from a change in the output impedance of the voice signal driver.

REFERENCES:
patent: 6477249 (2002-11-01), Williamson et al.
patent: 6718297 (2004-04-01), Pride et al.
patent: WO 9920027 (1999-04-01), None
patent: WO 9959322 (1999-11-01), None

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