Apparatus and method for recording digital video signals
CA 2073736 C · Owner: Kanota, Keiji · Inventors: Kanota, Keiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a digital VCR having a plurality of magnetic heads for recording digital video signals in slant tracks on a magnetic tape, a recording circuit divides a digital input video signal into data blocks and performs an orthogonal transformation such, as the discrete cosine transform in order to compress the data. The resulting blocks of coefficient data are recorded so that all coefficient data of a given block are recorded together by one of the magnetic heads on a single track. In this way propagation, of errors caused by head clogging or drop-outs is prevented.
Read the whole patent
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 July 13, 1992 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 2014.
- 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.