Speech bandwidth extension apparatus and speech bandwidth extension method
CA 2455059 A1 · 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 spectrum parameter calculator circuit (100) divides a decoded reproduction speech signal into frames and calculates a spectrum parameter for each of the frames. A coefficient calculator circuit (130) calculates a filter coefficient which has been shifted to a higher frequency and then increased in the frequency bandwidth and outputs the filter coefficient to a synthesis filter circuit (170). An adder (160) adds a noise signal of time length identical to the frame length and an adaptive code vector based on the past speech source signal, so as to obtain a speech source signal and outputs it to the synthesis filter circuit (170). An adder (190) uses the speech source signal having …
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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 July 26, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 26, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 2024.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.