Bandwidth expanding device and method
CA 2504175 A1 · Owner: Nec Corporation · Inventors: Ozawa, Kazunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bandwidth expanding device comprising a spectrum parameter calculating circuit (100) for calculating a spectrum parameter of a narrow-bandwidth input signal x(n), a coefficient calculating circuit (130) for receiving the spectrum parameter and converting it into the coefficient of a signal the bandwidth of which is expanded, a gain circuit (140) for receiving a gain from a gain control circuit (210), multiplying the output signal from a noise generating circuit (120) and the gain, and outputting the product to a combined filter circuit (170), the combined filter circuit (170) for receiving the coefficient from coefficient calculating circuit (130) to constitute a filter and …
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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 16, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2025.
- 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.