Method of and apparatus for coding speech signal
CA 2177226 C · Owner: Ozawa, Kazunori · Inventors: Ozawa, Kazunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speech coding apparatus produces sound with good quality even at a low bit rate. In the speech coding apparatus, a spectral parameter calculator determines spectral parameters from an inputted speech signal quantizes the, spectral parameters and outputs a plurality of quantization candidates. An adaptive code book is provided for determining delays with respect to each of said quantization candidates outputted from said spectral parameter calculator generating, a pitch predictive signal based on a past excitation signal for each of the delays and associating quantization candidates, and outputaing a quantization candidate and a delay which provide a minimum distortion between the speech …
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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 May 23, 1996 and granted October 3, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2018.
- 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.