Apparatus for modulating/demodulating signals

Details Apparatus for modulating/demodulating signals Apparatus for modulating/demodulating signals

1997-03-21

1999-10-05

Pham, Chi H.

Pulse or digital communications

Transceivers

Modems

375219, 370420, 370476, 379402, 379 936, 332108, H04B 138, H04J 300, H04M 100, H03K 300

Patent

active

059635886

ABSTRACT:
An apparatus connects a data processing system (10) with an analog telephone line and/or an ISDN line. The apparatus modulates and demodulates data from the data processing system (10) to either of the two different telephone protocols without adding unnecessary expense or noise to the system.

REFERENCES:
patent: 4884269 (1989-11-01), Duncanson et al.
patent: 5054034 (1991-10-01), Hughes-Hartogs
patent: 5214650 (1993-05-01), Renner et al.
patent: 5305312 (1994-04-01), Fornek et al.
patent: 5375166 (1994-12-01), Odaohara
patent: 5600654 (1997-02-01), Brown et al.
patent: 5708663 (1998-01-01), Wright et al.
patent: 5764693 (1998-06-01), Taylor et al.

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