Wide-band speech spectral quantizer
CA 2213020 C · 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
The present invention relates to speech coders and provides a wide-band speech spectral quantizer, and coder using same that, takes into consideration the correlationship among changes in sub-band spectral coefficients with time by quantizing a prediction error obtained by full-band inter-frame prediction. The quantizer comprises: a frame circuit for cutting out frames with a predetermined window length from a speech signal; a first band splitter for making predetermined frequency band splitting and computing each sub-band spectral coefficient; an analyzer for computing spectral coefficient vector of each subband; an adder for obtaining a result of subtraction of each sub-band predicted …
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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 August 14, 1997 and granted October 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 2019.
- 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.