Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1999-02-08
2000-08-01
Kuntz, Curtis A.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 9305, 37910015, 375222, H04M 1100, H04B 138
Patent
active
060977949
ABSTRACT:
A conventional computer is coupled to an analog telephone transmission link by means of 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. 166-167, 226-231, and 282-286 (1988).
"Microcomputer RTTY . . . a Software TU--use your 8080 and very little else," 73 Magazine for Radio Amateurs, pp. 78-52 (Jul. 1979).
Norrell Andrew L.
Suffern Robert C.
Eng George
Kuntz Curtis A.
U.S. Robotics Access Corp.
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