High definition b-mac television signal transmission system
CA 2000292 A1 · Owner: Scientific-Atlanta, Inc. · Inventors: Lucas, Keith
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for encoding a high definition television signal consistent with the B-MAC composite signal format comprises the steps of orthogonally sampling the high definition signal diagonally, filtering diagonal resolution information decimating alternate, samples of alternate lines and folding in high frequency horizontal resolution information by means of a skew-symmetric low-pass filter. Encoding apparatus involves the application of separable horizontal and vertical digital filters for the diagonal filter the, vertical filter being less complex than the horizontal filter. Furthermore only a line store is required at either an encoder or decoder location. At a receiver location a field …
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 October 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2011.
- 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.