Speech coding and decoding apparatus
CA 2014643 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Takahashi, Shinya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speech coding and decoding apparatus used for linear predictive coding of a speech signal and for transmitting it in a digital signal. In coding operation a linear predic-, tive residual signal is extracted from an input speech signal subjected to linear predictive analysis. The strength of the correlativity between the pitch periods of the waveform of the extracted linear predictive residual signal is obtained for every plural blocks. The time axis of the linear predictive residual signal for every two adjacent pitch period sections for the block in which the strength of correlativity of the waveform is not less than a predetermined threshold value and is larger than that of another …
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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 April 17, 1990 and granted May 3, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.