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

1977-11-03

1980-04-01

Engle, Samuel W.

Telegraphy

Systems

Printing

340149R, 340154, H04I 902

Patent

active

041963105

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: 3387268 (1968-06-01), Epstein
patent: 3478169 (1969-11-01), Saito
patent: 3611294 (1971-10-01), O'Neill et al.
patent: 3654604 (1972-04-01), Crafton
patent: 3716835 (1973-02-01), Weinberg et al.
patent: 3798360 (1974-03-01), Feistel
patent: 3962539 (1974-06-01), Ehrsam et al.
patent: 4004089 (1977-01-01), Richard et al.

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