Music signal time reverse effect apparatus
CA 2038384 C · Owner: Schwartz, Louis A. · Inventors: Schwartz, Louis A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for converting an input note signal of the type having a rapid rise and a slow exponential decay into an output note signal which, from the shape of its envelope appears to be, a time reversed version of the input note signal includes means for forming a normalized envelope signal En, and means for, modifying the instantaneous gain applied to the note signal as a function of the instantaneous amplitude of En. Ideally the, function is proportional to the inverse of the square of the instantaneous amplitude of the normalized envelope signal En. The note signal gain modification means in accordance with a first embodiment includes an analog-to-digital converter fed by En 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 March 18, 1991 and granted March 30, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2013.
- 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
Timeline From CIPO dates
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.