Vertical aperture correction circuit
CA 1109957 A · Owner: Sony Corporation · Inventors: Tanaka, Sadaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vertical aperture correction circuit is disclosed wherein undesirable amplitude changes of luminance signals of alternate lines are cancelled. First of all luminance signals of adjacent two lines are added for cancelling the undesirable amplitude changes in the main luminance signal. Further a difference between the luminance signals of adjacent two lines is squared for cancelling the undesirable amplitude changes in a vertical detail signal. By mixing the corrected main luminance signal and the vertical detail signal, a vertical aperture corrected video signal is obtained without the undesirable amplitude changes between lines.
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
- Granted September 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 1998.
- 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.