Interframe codec for composite color tv signals comprising means for inverting the polarity of carrier chrominance signals in every other frame or line
CA 1099394 A · Owner: Nippon Electric Co. Ltd. · Inventors: Iinuma, Kazumoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interframe encoder for a composite color television signal comprises an inverter for the polarity of the carrier chrominance signal. Responsive to a switching signal synchronized with the frame or line periods the television signal and the polarity-inverted signal are alternatingly switched into a converted signal in which the polarity of the carrier chrominance signal is inverted in every other frame or line period. The converted signal is interframe encoded. An interframe decoder reproduces the converted signal and the switching signal and comprises an inverter for the polarity of the reproduced carrier charminance signal. Responsive to the reproduced switching signal, the reproduced …
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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 April 14, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 14, 1998.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.