Notch filter for an interpolator/decimator filter structure
CA 1269723 C · Owner: Plessey Overseas Limited · Inventors: Dyer, Nigel P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter structure including a notch filter (C) designed to have a transmission zero at a frequency slightly displaced from one half of the lower sampling rate of the interpolator/decimator, and thus providing increase in attenuation at the half-rate frequency. The notch filter (C) is comprised of two like allpass-network filters (31 and 33) and has feed forward and feedback connections (39 and 41), the latter connection (41) including a coefficient multiplier (43). The feedback connection (41) is made between a tapped output (T) of the second of the network filters filter, (33) and an input node (35). The tapped filter,(33) is characterised by throughput and a tapped output transform …
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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
- Granted May 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 2007.
- 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.