Aubry S Forman

US Patent:

40486192, Sep 13, 1977

Filed:

Sep 7, 1976

Appl. No.:

5/721316

Inventors:

Aubry S. Forman - Toledo OH
Charles A. Schultz - Gainsville FL
William E. Vice - Gainsville FL

Assignee:

Digital Data Inc. - Toledo OH

International Classification:

H04B 726
H04H 108
H04J 114
H04Q 900

US Classification:

340154

Abstract:

A secure information broadcasting system including a central broadcasting station for encoding data in binary form utilizing a keyword and transmitting on one frequency a FM-SCA signal phase shift modulated by the encoded data. The encoded data is also supplied to one or more remote broadcasting stations, typically via telephone lines, where it is transmitted on a second frequency as a FM-SCA signal phase shift modulated by the encoded data. Each remote station transmits a relatively low power signal in a predetermined local area, such as an office building, while the central station transmits a relatively high power signal in a general area including one or more of the local areas. The general area signal is transmitted with a time delay relative to the remote stations. Each of a plurality of portable receiving terminals has an identification number stored therein.

US Patent:

41963105, Apr 1, 1980

Filed:

Nov 3, 1977

Appl. No.:

5/848269

Inventors:

Aubry S. Forman - Toledo OH
Charles A. Schultz - Gainesville FL
John F. Schultz - Gainesville FL

Assignee:

Digital Data, Inc. - Sylvania OH

International Classification:

H04I 902

US Classification:

178 22

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.

US Patent:

41123697, Sep 5, 1978

Filed:

Apr 9, 1976

Appl. No.:

5/675504

Inventors:

Aubry S. Forman - Toledo OH
Charles A. Schultz - Gainesville FL
John F. Schultz - Gainesville FL

Assignee:

Digital Data, Inc. - Toledo OH

International Classification:

H04K 100

US Classification:

325 34

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.