Method for decoding an audio signal with transmission error correction
CA 2285650 C · Owner: Proust, Stephane · Inventors: Proust, Stephane
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An audio signal coded by successive frames is represented by a binary stream (F) received with data (BFI) signalling possible erased frames. For each frame the method consists in filtering the excitation signal (E<k>(n)) formed on the basis of excitation parameters (EX(n)) recovered in the binary stream (valid frame) or estimated otherwise (erased frame) using a synthesis filter (22) to obtain a decoded signal ( SIGMA n(t)). A linear prediction of the decoded signal is carried out up to the preceding frame to estimate a synthesis filter relative to the current frame. The synthesis filters used as long as no frame is erased are in conformity with the estimated synthesis filters. If one 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 February 3, 1999 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2021.
- 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.