Modulating method and demodulating method as well as modulating apparatus and demodulating apparatus
CA 2091208 A1 · Owner: Chaki, Yasuyuki · Inventors: Shimpuku, Yoshihide; Nakagawa, Toshiyuki; Chaki, Yasuyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A modulating method and apparatus and a demodulating method and apparatus in which a variable length code (d, k;m, n,r) which can provide a greater minimum reversal distance to allow recording of a higher density than ever is provided. According to the modulating method and apparatus, digital data of a basic data length of m bits is modulated into a variable length code (d, k;m, n;r) of a basic code length of n bits, and where the distance between adjacent ones of the digital data is represented by T, the minimum reversal distance of the variable length code is equal to or greater than 2.0T and the minimum length of a run of a same symbol is equal to or greater than 4. The demodulating …
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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 March 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2015.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.