An improved rcelp coder
CA 2183283 C · Owner: Kleijn, Willem Bastiaan · Inventors: Nahumi, Dror; Kleijn, Willem Bastiaan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method of speech coding for use in conjunction with speech coding methods wherein speech is digitized into a plurality of temporally defined frames each frame including a plurality of sub-frames and the digitized speech is partitioned into periodic components and a residual signal. For each of a plurality of sub-frames of the residual signal the improved method of speech coding selects and applies a time shift T to the sub- frame by applying a matching criterion to (a) the current sub-frame of the residual signal and (b) a sample-to-sample (sub-frame-to-subframe) pitch delay determined by applying linear interpolation to known pitch delays occurring at or near frame-to-frame …
Read the whole patent
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 14, 1996 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 2018.
- 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
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.