Gain-shape vector quantization apparatus
CA 2019804 C · Owner: Unagami, Shigeyuki · Inventors: Ohta, Yasuji; Amano, Fumio; Unagami, Shigeyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gain-shape vector quantization apparatus for compressing the data of voice signals, comprising a code book portion which is constituted by a plurality of shape vectors and produces a plurality of selected shape vectors, a plurality of variable gain circuits that impart gains to the shape vectors produced from said code book portion, a plurality of synthesis filters that regenerate signals from the outputs of said variable gain circuits, an adder for adding the signals regenerated by said synthesis filters, and an evaluation unit which produces an index to select a plurality of shape vectors in the code book portion in order to minimize the error between the output of said adder and an …
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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 June 26, 1990 and granted May 31, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.