Adaptive iir multitone detector
CA 2196010 C · Owner: Chesir, Aaron Michael · Inventors: Chesir, Aaron Michael; May, Carl Jerome
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An adaptive Infinite Impulse Response (IIR) filter is provided that can adaptively, detect the presence of one or more tones in its input stream. The tones to be detected, may be of arbitrary frequency subject only to a limitation that such tones fall within a, frequency band consistent with accepted sampling principles (e.g. a maximum frequency of interest no greater than one-half the sampling frequency - Nyquist, sampling criteria). An IIR filter developed according to the method of the invention will, adaptively locate the frequencies of tones to be detected thereby allowing , for frequency, drift from nominal expected frequency values with no loss in accuracy. Such a filter will, …
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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 January 27, 1997 and granted November 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 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
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.