Audio coder utilising repeated transmission of packet portion
CA 2344259 C · Owner: Davis, Andrew Gordon · Inventors: Turnbull, Rory Stewart; Davis, Andrew Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coder (13) generates a first output providing first data S1(n) from which a decoder can produce a reconstructed signal and a second output providing second, enhancement, data S2(n) whereby a decoder receiving both the first and second data can produce a higher quality reconstructed signal. Packets of data are assembled for transmission, each packet containing primary data which includes the first data S1(n) in respect of a temporal portion n of the signal and the second data S2(n) in respect of the same portion of the signal and secondary data which includes the first data S1(n+1) in respect of a different temporal portion of the signal.
Read the whole patent
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 September 14, 1999 and granted June 21, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 14, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2021.
- 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.