Methods and devices for low-frequency emphasis during audio compression based on acelp/tcx
CA 2556797 C · Owner: Bessette, Bruno · Inventors: Bessette, Bruno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and device for switching from a first sound signal coding mode to a second sound signal coding mode at the junction between a previous frame coded according to the first coding mode and a current frame coded according to the second , coding mode, wherein the sound signal is filtered through a weighting filter to produce, in the current frame, a weighted signal. In the method and device a zero-, input , response of the weighting filter is calculated the zero-input response is , windowed so that the zero-input response has an amplitude monotonically decreasing to zero after a , predetermined time period and in the current frame, the windowed zero-input response is removed from …
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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 18, 2005 and granted January 7, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 18, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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Timeline
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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.