Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks
CA 2924914 C · Owner: Dolby International Ab · Inventors: Kjorling, Kristofer; Villemoes, Lars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels reduced aliasing is achieved, Furthermore the grouping of the channels during gain-calculation gives an improved energy estimate of the real valued subband signals in the filterbank.
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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 August 27, 2003 and granted June 26, 2018. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2025.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.