Methods of and apparatus for digital video signal processing
CA 2029406 C · Owner: Wilkinson, James Hedley · Inventors: Wilkinson, James Hedley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for demultiplexing an input 4:4:4:4-standard digital video signal into first and second output 4:2:2-standard digital video signals comprises a demultiplexer for separating the input video signal into a luminance input signal, two chrominance input signals and a key, input signal; for each said chrominance input signal a first low-pass, filter for low-pass filtering said chrominance input signal with a cut-off frequency preferably equal to 7/16 the Nyquist frequency of the input chrominance signal, a sub-sampler for sub-sampling the signal from the first filter at a ratio of 2:1 to provide a first chrominance output signal, a subtracter for subtracting the signal from the first …
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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
- Filed November 6, 1990 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2012.
- 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
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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.