Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1993-12-27
1996-06-04
Chan, Jason
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 88, 379100, 379 58, 379 59, 379 98, 379442, H04M 1100, H04M 164, H04M 100
Patent
active
055240470
ABSTRACT:
An emulator circuit is provided for allowing a data/fax/voice modem, a host computer, and a telephone headset to emulate the functions of a telephone. For voice communications, the emulator circuit connects the telephone headset to a communication device such as a telephone line or cellular radio. For automated data/fax/voice communications, the emulator circuit connects the modem to the communication device. Two specific embodiments of the emulator circuit are described. In one, the emulator circuit is configured from analog circuit components connected to the modem. In the other, the emulator circuit is an integrated circuit component of the modem. In both embodiments, the provision of the emulator circuit obviates the need to provide a separate telephone for handling voice telephone conversations and other communications through said telephone line, cellular radio. An embodiment is also described wherein an emulator circuit is connected to either a telephone line or a cellular radio or other communication device. A switch is provided for selecting between the telephone line and the cellular radio.
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FAXMODEMS, Rockwell International, pp. 18-19.
RC224ATF, Single Device Data/Fax Modem with "AT" Commands; Rockwell International, p. 2.
R96DFX 9600 bps MONOFAX.RTM. Modem with Error Detection and DTMF Reception, Rockwell International, Document No. 29200N60, Order No. MD60, Rev. 1, Nov. 1990.
9600 bps MONOFAX.RTM. Modem Designer's Guide; Rockwell International, Digital Communications Division, Order No. 820, Rev. 2, Dec. 1991.
Brown Paul M.
Hedayat Shahin
Urbani George V.
Chan Jason
Cirrus Logic Inc.
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