Multiplexed coded modulation with unequal error protection
CA 2083725 C · Owner: Calderbank, Arthur Robert · Inventors: Calderbank, Arthur Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a time-division-multiplexing communications system which, transmits information from various sources in different time-slots additional, information is transmitted by varying the pattern of time slot assignments in accordance with a set of rules. As a result the assignment pattern by which , time slots are assigned to each of the various sources of information conveys , additional, information. Specifically a High Definition Television (HDTV) transmission system is constructed in which picture information is transmitted by time-division-multiplexing between two different and disjoint, signal point , constellations. Additional information is conveyed by the rule for switching between 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 November 25, 1992 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2014.
- 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.