IC card-type modem and method for communicating data by IC card-

Details IC card-type modem and method for communicating data by IC card- IC card-type modem and method for communicating data by IC card-

1995-05-31

1997-04-22

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

379398, H04B 138, H04M 704

Patent

active

056235143

ABSTRACT:
An IC card-type modem comprises a modulation demodulation unit, an impedance conversion unit, an impedance matching unit, and a matching selection unit. The modulation demodulation unit connected to a terminal equipment modulates and demodulates a data stored in the terminal equipment. The impedance conversion unit converts impedances between the modulation demodulation unit and a line. The impedance matching unit has a plurality of impedance matching elements having impedances that differ one another. The matching selection unit selects an impedance matching element which matches the impedance of the modulation demodulation unit to the impedance of the line within the plurality of impedance matching elements, and connects the selected impedance matching element to the impedance conversion unit.

REFERENCES:
patent: 5249225 (1993-09-01), Williams

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