Combined telephone and data-transfer system

Details Combined telephone and data-transfer system Combined telephone and data-transfer system

1980-11-18

1983-06-07

Brown, Thomas W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

179 71R, 358 85, H04M 1100, H04M 1500, H04N 714

Patent

active

043872719

ABSTRACT:
Telephone lines extending between a central office and associated subscriber stations are provided at opposite ends with mutually complementary modems and with couplers by which code signals from subscriber-operated address selectors can be sent to a common data network containing specialized information or to associated data-retrieval units. The latter are connected in parallel to a bus originating at a data bank from which data bits grouped into pages are continuously emitted at high speed. Each retrieval unit comprises two shift registers, one of them being loadable from the bus by the incoming high-speed bits to store a complete page together with an accompanying address code while the other receives a selected address code from the associated subscriber. A comparator, upon detecting an identity between the coded addresses stored in the two registers, stops the loading of the first shift register and commands its readout over the subscriber line at a slow rate compatible with that line's bandwidth. At the subscriber station the incoming data are displayed on a viewer of a data terminal or, with the aid of an adapter, on a television receiver. The transmission of address codes and other data over any subscriber line occurs between the two modems thereof at frequencies outside the voice band.

REFERENCES:
patent: 3937889 (1976-02-01), Bell et al.
8081 Proceedings of the National Electronics Conference, vol. 33, Oct. 29-31, 1979, pp. 488-494.
International PCT Application WO 80/00757 (Kirschner et al.), Published Apr. 17, 1980.
"A Design for a Small Viewdata Center Based on Distributed Control", by Coakley et al., International Conference on Private Electronic Switching Systems, London, Apr. 1978, pp. 85-89.
"Introducing the Captain System, " by T. Tomita, Proceedings of the Pacific Telecommunications Conference, Honolulu, Jan. 1979, pp. 4A/15-23.
"Captain System," by T. Kumamoto and T. Kitamura, Japan Telecommunications Review, Jul. 1980, pp. 215-222.
"A Digital Transmission System for Multi-Terminal Applications," by Clothier and Bylanski, GEC Telecommunications Journal 41, 1980, pp. 10-16.

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