Method for suppressing narrow frequency bands
CA 2356183 A1 · Owner: Baldemair, Robert · Inventors: Baldemair, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for suppressing narrow frequency bands during transmission of data by means of a multi-carrier method e.g. DMT , (discrete multitone). A predetermined broad frequency band is divided into numerous subchannels having sub-carriers assigned thereto. The data to be transmitted is modulated in the transmitter by means of inverse discrete Fourier transformation (IDFT) and is demodulated in the receiver by discrete Fourier transformation (DFT). A pulse for compensating the side lobes which appear in the phase-out area is transmitted for each frequency range having a zero charge and extending between the subcarriers which are contained in the phase-out area …
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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 December 21, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2021.
- 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.