Disc driving device and wobble information detection method
CA 2431014 C · Owner: Panasonic Corporation · Inventors: Stek, Aalbert; Schep, Cornelis Marinus; Heemskerk, Jacobus Petrus Josephus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an optical disc, a wobble signal is to be detected by a simple configuration. In the optical disc, the address information modulated onto a , sinusoidal carrier signal by adding even harmonics signals to said sinusoidal carrier signal and by changing the polarity of said harmonics signals is , formed into the wobble signal. In detecting the wobble signal from the optical disc to demodulate the address information in a method for detecting the , wobble signal an even harmonics signal and data clocks are generated and the , even harmonics signal so generated are multiplied with the reproduced wobble signal. The resulting product signal is integrated every data clock. The sign of the …
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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 10, 2002 and granted December 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2024.
- 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
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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.