Digital filter
CA 2020264 C · Owner: Nec Corporation · Inventors: Taguchi, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital filter receives an input data of N bits and generates an output data obtained by totally summing partial products each of which corresponds to a product of each bit and a predetermined coefficient. This digital filter comprises an input register for latching the input data in the form of L divided blocks each composed of M bits a delay-latch, circuit connected to the input latch and for outputting the N-bit data with a predetermined delay time, a multiplication circuit having M memories and for multiplying a predetermined coefficient to each bit for each of the M-bit blocks outputted from the input register and the delay-latch circuit and an addition circuit for sequentially …
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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 June 29, 1990 and granted November 30, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2012.
- 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.