Process for finding the overall monitoring threshold during a bit-rate-reducing source coding
CA 2103147 C · Owner: Groh, Jens · Inventors: Krafft, Wolfgang; Groh, Jens; Sedlmeyer, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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In order to find the overall monitoring threshold during a bit-rate-reducing source coding of digitized audio signals, a requantization and coding regulation for the time or spectral scanning values of the audio signal is found from the masking effect of all relevant maskers and noise maskers and from the steady audio threshold. To this end the masking sides of the selected maskers are segmented and approximated in the individual segments by low-order polynomials whereby, the coefficients of the low-order polynomials are found. The intensities of the maskers converted into a logarithmic level are used to find the coefficients of the low-order polynomials. The overall monitoring threshold is …
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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 July 21, 1992 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2014.
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