Secure SCA broadcasting system including subscriber actuated por

Details Secure SCA broadcasting system including subscriber actuated por Secure SCA broadcasting system including subscriber actuated por

1976-04-09

1978-09-05

Engle, Samuel W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 32, 340152R, H04K 100

Patent

active

041123697

ABSTRACT:
A secure information broadcasting system including a central transmitting station for encoding data in binary form utilizing a keyword and transmitting a FM-SCA signal phase shift modulated by the encoded data. Each of a plurality of portable receiving terminals has an identification number stored therein. When a subscriber desires to display the broadcast information on his terminal, he enters a unique password which is combined with the identification number to generate the keyword. The keyword is utilized to decode the received binary data. The portable terminal includes a receiver for decoding the phase shifted FM-SCA signal into the encoded binary data; a keyboard for entering the password, information and display commands; an alpha-numeric data display; a processor responsive to the inputs from the receiver and the keyboard for performing selected arithmetic and logic operations to generate output data to the data display and a bus connecting the circuits of the portable terminal for parallel signal flow.

REFERENCES:
patent: 2840815 (1958-06-01), Andres et al.
patent: 3113294 (1963-12-01), Parker
patent: 3257644 (1966-06-01), Moore
patent: 3299210 (1967-01-01), Bawdy
patent: 3337691 (1967-08-01), Litchman
patent: 3387268 (1968-06-01), Epstein
patent: 3478169 (1969-11-01), Saito
patent: 3499995 (1970-03-01), Clark
patent: 3679832 (1972-07-01), Halpern
patent: 3723890 (1973-03-01), Hutsinger
patent: 3899772 (1975-08-01), Mead et al.

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