A highly efficient coding apparatus
CA 2011034 C · Owner: Sony Corporation · Inventors: Shirota, Norihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A highly efficient coding apparatus for coding digital video data in a block format allowing video data compression by data transmission channel having a predetermined transmission capacity wherein, the coefficient data including a DC component and a plurality of AC components for each block is generated by the orthogonal transformation. A first distribution table of the AC coefficient data is generated during a predetermined period and a second, distribution table of accumulating type is generated from -the first distribution table. The total bit number of the ACA coefficient data during the predetermined period is controlled by the second distribution table and the predetermined …
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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 February 27, 1990 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 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
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.