Adaptive fir filter having restricted coefficient ranges
CA 2027236 A1 · Owner: Gec Plessey Telecommunications Limited · Inventors: Dyer, Nigel P.; Poole, Steven J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The adaptive FIR filter comprises a foreground non adaptive filter and a background adaptive filter. The background filter has N tap stages, some of which have their coefficient values applied to a summator. The output of the summator is compared with a predetermined constant K and produces an update enable signal This signal controls a switch which corrects the output of a discriminator. The discriminator compares the performance of the foreground and background filter, to either the foreground filter or the background filter to prevent the coefficient values of the foreground filter being updated by the background filter when the coefficient values of the background filter are …
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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 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.