Audio signal processing using improved perceptual model
CA 2419765 A1 · Owner: Kuo, Shyh-Shiaw · Inventors: Johnston, James David; Kuo, Shyh-Shiaw
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A perceptual model based on psychoacoustic auditory experiments is based on the, (time-domain) roughness of an input signal envelope in particular cochlea filter bands rather, than the noise-like vs. tonal nature of the input signal. In illustrative embodiments, frequency domain techniques are used to develop envelope and envelope roughness, measures, and such roughness measures are then used to derive Noise Masking Ratio, (NMR) values for achieving a high level of noise masking in coder embodiments. Coder, embodiments based on present inventive teachings are compatible with wellknown AAC, coding standards.
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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 February 25, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2025.
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Timeline
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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.