Hearing-adapted quality assessment of audio signals
CA 2271880 C · Owner: Sporer, Thomas · Inventors: Sporer, Thomas; Seitzer, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method for assessing the quality of an audio test signal (14) which has , been derived by coding and decoding an audio reference signal (12) the audio , test signal (14) is compared with the audio reference signal (12) as it were, behind the cochlea of the human ear. All masking effects and the transmission functions of the ear are equally applied to the audio reference signal (12) and to the audio test signal (14). To this end the audio test signal (14) is , broken down according to its spectral components by means of a first bank of filters (20) consisting of filters overlapping in frequency and defining spectral regions, said filters having differing filtering functions which , …
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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 October 2, 1997 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.