Method and apparatus for correcting timing errors for a multi-picture display
CA 2018529 C · Owner: Willis, Donald Henry · Inventors: Canfield, Barth Alan; Willis, Donald Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A picture-in-a-picture television receiver displays a compound image which includes a compressed image derived from an auxiliary signal inset in a full-size image derived from a main signal. The auxiliary composite video signal is sampled synchronous with a system clock signal that is burst locked to the main signal. The sampled data signal is separated into luminance and color information component signals, which are subsampled and stored in a field memory synchronous with the system clock signal. The clock signal phase used for horizontal subsampling is determined at the start of each line to compensate for skew errors in the auxiliary signal. The luminance samples retrieved from the …
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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 June 7, 1990 and granted September 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 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.