Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1995-06-06
1998-03-03
Kuntz, Curtis
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 90, 379 93, 375222, H04M 1100
Patent
active
057244138
ABSTRACT:
A conventional computer is coupled to an analog telephone transmission link by an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes programs which transfer data between the computer's memory and the interface adapter. Using the same interface adapter and existing processor, the arrangement may be used to send and receive images in the form of standard V.29 format facsimile data, to send and receive data operating as a synchronous IBM 3270 compatible terminal device, or to record and play back conventional voice transmissions rather than data to implement a telephone answering, voice message handling, and telemarketing systems.
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CCITT Recommendation T.4 on "Standardization of Group 3 Facsimile Apparatus for Document Transmission." The Theory and Practice Modem Design, by John A.C. Bingham, pp. 1660167, 226-231, and 282-286, (1988).
Norrell Andrew L.
Suffern Robert C.
Kuntz Curtis
Palan Stephen
U.S. Robotics, Inc.
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