Cryptography – Key management – Having particular key generator
Patent
1989-09-11
1991-10-08
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
358147, 358165, 358189, 455 6, H04N 324, H04N 546
Patent
active
050561383
ABSTRACT:
A system connectable into standard television receiver systems for converting predetermined channels thereof to audio only channels and detecting selection of the predetermined channels to cause blanking of the picture tube at individual receivers in the system. The antenna or cable input is altered by supplying a carrier with audio, code and horizontal sync information at a frequency corresponding to that of an unused channel. A tone decoder is responsive to the code and horizontal sync information to cause blanking of the display while the audio information is reproduced in normal manner.
REFERENCES:
patent: 3732365 (1973-05-01), Rando et al.
patent: 3999005 (1976-12-01), Dickinson
patent: 4318125 (1982-03-01), Shutterly
patent: 4319277 (1982-03-01), Nicholson et al.
patent: 4554584 (1985-11-01), Elam et al.
Cantor Jay M.
Gregory Bernarr E.
Nuphase Electronics, Inc.
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