Voice coding apparatus, voice decoding apparatus and voice coding and decoding system
CA 2258430 A1 · Owner: Nec Corporation · Inventors: Serizawa, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A voice coding apparatus and a voice decoding apparatus are provided in order to improve the coding and decoding efficiency by eliminating useless coding levels. The apparatuses comprises an input terminal 24A for inputting the sub-frame length and for delivering it to the sub-frame dividing circuit 10 and an unit length calculating circuit 32A. The unit length calculating circuit calculates the unit length which determine a pulse interval from the sub-frame length supplied from the input terminal 24A and from a fundamental vector length supplied from the input terminal 26A and delivers the obtained unit length to the table conversion circuit. The table designing circuit 34A designs 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 January 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 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.