Multi-band digital receiving apparatus and method with bandwidth reduction
CA 2173376 C · Owner: Kosaka, Roger N. · Inventors: Kelley, Edwin A.; Kosaka, Roger N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Multiple simultaneous uses of a multi-service digital receiver are made possible with a single practical analogto-digital converter (38) by translating the various service bands in frequency to form a single generally contin-, uous composite service band in which substantial frequency gaps (6) between the different services are eliminated. Bandwidth requirements are further reduced by a bandfolding technique in which at least one service waveband is divided about an intermediate mixing frequency (Fmix) the divided, portions are overlapped so that they collectively occupy a sub-waveband with a smaller bandwidth than the original band, and the mixing frequency (Fmix) is chosen such that …
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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 April 30, 1992 and granted October 20, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2014.
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Timeline
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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.