Speech and music signal coder/decoder
CA 2335284 A1 · Owner: Nec Corporation · Inventors: Murashima, Atsushi; Ozawa, Kazunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A voice/music signal encoder/decoder having a band-division structure for well encoding voice/music signals over the full band. A residual vector is generated by means of an inverted filter (230 ) from a differential vector outputted from a first differential unit (180). A band selecting circuit (250) generates n sub-vectors from an orthogonally-transformed residual vector by using components contained in an arbitrary band. An orthogonal transformation coefficient quantizing circuit (260) quantizes the n sub-vectors.
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 June 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 15, 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.