US4196310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secure SCA broadcasting system including subscriber actuated portable receiving terminals
Assignee: Digital Data Inc
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Filing: 1977-11-03
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Granted: 1980-04-01
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Expires: 1997-11-03
Abstract
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.
Inventors
- 👤 Aubry S. Forman
- 👤 Charles A. Schultz, Jr.
- 👤 John F. Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:18
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/28; H04H20/33; H04H20/34; H04H40/00; H04H40/18; H04H60/00; H04H60/27; H04L; H04L12/00; H04L12/02; H04L12/16; H04L12/18; H04L12/1804
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A secure information broadcasting system including a transmitting station for encoding as binary coded bits data received from an information source, for modulating a carrier wave with the data bits and for transmitting the modulated carrier wave and a plurality of portable terminals for receiving and selectively displaying the data, each of said portable terminals comprising: receiver means for separating the modulation signal from the carrier wave and generating the encoded binary data bits from the modulation signal; keyboard means for generating a binary coded password individual to each of said portable terminals; storage means for generating a binary coded identification number individual to each of said portable terminals; and processing means responsive to said password and said identification number for generating a binary coded keyword having a predetermined number of bits, said processing means being responsive to said keyword and a number of said encoded binary data bits equal to said predetermined number for decoding said encoded binary data bits.
Claim 2
Dependent Claim
161 words
A secure information broadcasting system including a transmitting station for encoding as binary coded bits data received from an information source, for modulating a carrier wave with the data bits and for transmitting the modulated carrier wave and a plurality of portable terminals for receiving and selectively displaying the data, each of said portable terminals comprising: receiver means for separating the modulation signal from the carrier wave and generating the encoded binary data bits from the modulation signal; keyboard means for generating a binary coded password individual to each of said portable terminals; storage means for generating a binary coded identification number individual to each of said portable terminals; and processing means responsive to said password and said identification number for generating a binary coded keyword having a predetermined number of bits, said processing means being responsive to said keyword and a number of said encoded binary data bits equal to said predetermined number for decoding said encoded binary data bits.
Claim 3
Dependent Claim
27 words
A system according to claim 1 wherein said processing means rotates said keyword by one bit after said number of said encoded binary data bits are decoded.
Claim 4
Dependent Claim
35 words
A system according to claim 1 wherein said processing means is responsive to said password for generating a pseudo random number and exclusive-OR's said pseudo random number and said identification number to generate said keyword.
Claim 5
Dependent Claim
72 words
A system according to claim 3 wherein a first one of said number of said encoded binary data bits is decoded to generate a seed number, said processing means is responsive to said seed number for generating a second pseudo random number and said processing means exclusive-OR's said second pseudo random number and a second one of said number of said encoded binary data bits to decode said encoded binary data bits.
Claim 6
Dependent Claim
18 words
A system according to claim 1 wherein said decoded encoded binary data bits represent stock market quotation information.
Claim 7
Independent Claim
111 words
A method for providing subscriber access to binary coded data in a secure information broadcasting system comprising the steps of: a. generating encoded binary data by exclusive-OR'ing said binary coded data with a binary coded keyword; b. transmitting said encoded binary data from a transmitting station; c. receiving said encoded binary data at a plurality of subscriber receiving terminals; d. exclusive-OR'ing a subscriber generated binary coded password with a binary coded identification number to generate said keyword, said password and said identification number individual to each of said receiving terminals; and e. exclusive-OR'ing said keyword with said encoded binary data to decode said encoded binary data into said binary coded data.
Claim 8
Independent Claim
111 words
A method for providing subscriber access to binary coded data in a secure information broadcasting system comprising the steps of: a. generating encoded binary data by exclusive-OR'ing said binary coded data with a binary coded keyword; b. transmitting said encoded binary data from a transmitting station; c. receiving said encoded binary data at a plurality of subscriber receiving terminals; d. exclusive-OR'ing a subscriber generated binary coded password with a binary coded identification number to generate said keyword, said password and said identification number individual to each of said receiving terminals; and e. exclusive-OR'ing said keyword with said encoded binary data to decode said encoded binary data into said binary coded data.
Claim 9
Independent Claim
183 words
A method for providing subscriber access to binary coded data in a secure information broadcasting system comprising the steps of: a. generating encoded binary data by exclusive-OR'ing said binary coded data with a binary coded keyword; b. transmitting said encoded binary data from a transmitting station; c. receiving said encoded binary data at a plurality of subscriber receiving terminals; d. seeding a random number generator with a subscriber generated binary coded password to generate a first binary coded pseudo random number, said password individual to each of said receiving terminals; e. exclusive-OR'ing said first pseudo random number with a binary coded identification number to generate said keyword, said identification number individual to each of said receiving terminals; f. exclusive-OR'ing said keyword with a first portion of said encoded binary data to generate a binary coded seed number; g. seeding said random number generator with said seed number to generate a second binary coded pseudo random number; and h. exclusive-OR'ing said second pseudo random number with a second portion of said encoded binary data to decode said second portion into said binary coded data.
Claim 10
Independent Claim
183 words
A method for providing subscriber access to binary coded data in a secure information broadcasting system comprising the steps of: a. generating encoded binary data by exclusive-OR'ing said binary coded data with a binary coded keyword; b. transmitting said encoded binary data from a transmitting station; c. receiving said encoded binary data at a plurality of subscriber receiving terminals; d. seeding a random number generator with a subscriber generated binary coded password to generate a first binary coded pseudo random number, said password individual to each of said receiving terminals; e. exclusive-OR'ing said first pseudo random number with a binary coded identification number to generate said keyword, said identification number individual to each of said receiving terminals; f. exclusive-OR'ing said keyword with a first portion of said encoded binary data to generate a binary coded seed number; g. seeding said random number generator with said seed number to generate a second binary coded pseudo random number; and h. exclusive-OR'ing said second pseudo random number with a second portion of said encoded binary data to decode said second portion into said binary coded data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |