Data base accessing system

Details Data base accessing system Data base accessing system

1985-08-08

1987-10-13

George, Keith E.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 95, H04M 1100

Patent

active

047003782

ABSTRACT:
Inexpensive communication is provided between a data base and a plurality of subscribers each equipped with only a telephone and a TV set by using only tone signals to communicate from the subscribers to the data base, and data signals at least partially to communicate from the data base to the subscribers. For this purpose, each subscriber location needs to be provided with only the demodulator portion of a modem, and the base location needs to be provided only with the modulator portion of a modem and a tone decoder. A microprocessor-controlled security device is disclosed for remotely disabling a subscriber's module in case of misuse.

REFERENCES:
patent: 3984638 (1976-10-01), Carrouge
patent: 4465901 (1984-08-01), Best
patent: 4500751 (1985-02-01), Darland et al.
patent: 4581484 (1986-04-01), Bendig
Chrisfield et al., "Time Sharing Circuit for Voice and FSK Data," IBM Technical Disclosure Bulletin, vol. 17, No. 2, pp. 477-478, Jul. 1974.

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