Digital audio broadcasting method and apparatus using complementary pattern-mapped convolutional codes
CA 2482992 C · Owner: Ibiquity Digital Corporation · Inventors: Kroeger, Brian W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of transmitting digital information uses the steps of forward error correction coding (56) a plurality of bits of digital information (54) using complementary pattern-mapped convolutional codes modulating (62) a plurality , of carrier signals with the forward error correction coded bits and , transmitting (76) the modulated carrier signals. The modulation can include the step of independently amplitude shift keying the in-phase and quadrature components of the QAM constellation using Gray codes corresponding to amplitude levels. Receivers for such signals are also described.
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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 April 21, 2003 and granted October 14, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2025.
- 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.