Video picture signal scrambling system
CA 1301911 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Masuko, Akinori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A video picture signal scrambling system for subscription broadcast or cablecast television systems which can scramble video signals without adverselly affecting pictures received at a subscriber's terminal. The system includes a detector for detecting the brightness level of the picture signal over a predetermined interval, a comparator for comparing the brightness level with a first predetermined reference value and a scrambling circuit responsive to the comparator for inhibiting reversion of the picture signal when the brightness level is lower than the first reference value and for, selectively reversing the picture signal in response to changes in the brightness level in successive …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.