Reconstruction of the spectrum of an audiosignal with incomplete spectrum based on frequency translation
CA 2475460 C · Owner: Truman, Michael Mead · Inventors: Vinton, Mark Stuart; Truman, Michael Mead
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An audio signal is conveyed more efficiently by transmitting or recording a baseband of the signal with an estimated spectral envelope and a noiseblending parameter derived from a measure of the signal~s noise-like quality. The signal is reconstructed by translating spectral components of the baseband signal to frequencies outside the baseband adjusting phase of the regenerated , components to maintain phase coherency adjusting spectral shape according to the estimated spectral envelope, and adding noise according to the noiseblending parameter. Preferably, the transmitted or recorded signal also includes an estimated temporal envelope that is used to adjust the temporal shape of the …
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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 March 21, 2003 and granted February 28, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2025.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.