Variable bit-rate celp coding of speech with phonetic classification
CA 2382575 A1 · Owner: Atmel Corporation · Inventors: Wang, Shihua
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speech coding method using analysis-by-synthesis includes sampling an input speech and dividing the resulting speech samples into frames and subframes. The frames are analyzed to determine coefficients for the synthesis filter (136). The subframes are categorized into unvoiced (116) voiced (118) and , onset (114) categories. Based on the category a different coding scheme is , used. The coded speech is fed into the synthesis filter (136) the output , (138) of which is compared to the input speech samples (104) to produce an error signal (144). The coding is then adjusted per the error signal.
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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 23, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2022.
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Timeline
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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.