Frequency estimating circuit and afc circuit using the same
CA 2196468 C · Owner: Sogabe, Yasushi · Inventors: Sogabe, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a frequency estimating circuit in which estimating a frequency offset distributed outside the observation range based on the frequency of a received pilot signal degenerated into the observation range. The frequency estimating circuit comprises a time-axis to frequency-axis converter circuit for converting an input data stream constructed of a sampled quantized received pilot signal into a signal on a frequency axis to determine a power spectrum, and an MAX search circuit for searching for the maximum value of the power spectrum to determine the frequency f1, corresponding to the maximum value of the power spectrum, and a frequency computing circuit for computing …
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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 January 31, 1997 and granted September 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2019.
- 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.