Speech coding apparatus
CA 2015274 C · Owner: Ota, Yasuji · Inventors: Ota, Yasuji; Taniguchi, Tomohiko; Tanaka, Yoshinori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speech coding apparatus including multipliers and prediction filters which successively process a plurality of signal vectors obtained from an index 2M and dimension N code book to obtain a reproduced speech signal; error detectors which find the error between the input speech signal and reproduced speech signal; and evaluators which calculate the optimum signal vectors giving the smallest errors, wherein the multipliers are connected to a reduced code book, which reduced code book is constituted of n number of code book blocks of index 2M/n and dimension N/n (where n is an integer of two or more) and wherein there are n number of multipliers, n number of prediction filters n number of, …
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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 24, 1990 and granted July 19, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 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.
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.