Clamp level setting method for television signals
CA 2012298 C · Owner: Cho, Fujio · Inventors: Ashida, Yasuharu; Cho, Fujio; Shimizu, Toshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A clamp level setting method for clamping the level of a predetermined position in a television signal to a predetermined clamp level is described. The method is suitable for a television signal encoder having an analog to digital converter and several quantizers. The predetermined clamp level is set to a level such that the television signal is within the dynamic range of the A/D converter and the quantization error by the quantizer having the largest quantization step size among the several quantizers is minimized.
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 March 15, 1990 and granted July 26, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2012.
- 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.