System and method for determining a suitable impedance for a...

Details System and method for determining a suitable impedance for a... System and method for determining a suitable impedance for a...

2008-10-23

2011-11-15

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S219000, C375S220000, C375S221000, C375S223000, C375S257000, C379S394000, C379S395000, C379S398000

Reexamination Certificate

active

08059703

ABSTRACT:
A system includes a plurality of modules which are configured for determining a suitable impedance for a modem. The plurality of modules send signals with a plurality of signal frequencies to a telephone and receive feedback signals from the telephone under each of a plurality of impedances of the modem, compute a total decibel value of the feedbacks under each impedance, and determine a suitable impedance according to a minimum total decibel value from the plurality of total decibel values.

REFERENCES:
patent: 6192109 (2001-02-01), Amrany et al.
patent: 6724890 (2004-04-01), Bareis
patent: 7227959 (2007-06-01), Abraham
patent: 7558385 (2009-07-01), Rayher et al.
patent: 2005/0232300 (2005-10-01), Stiscia et al.
patent: 2007/0190952 (2007-08-01), Waheed et al.

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