Video signal processing
CA 1313407 C · Owner: Levy, David Fraser · Inventors: Andrews, Mark Richard; Levy, David Fraser; Snashall, Martin Gerald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for keying TV signals. A keying signal, K, is employed to create first and second modified keying signals, K(A) and K(B), which commence at independent points in time. The modified signals are compared and as, a result, a revised keying signal, R is produced commencing, at the leading edge of one modified keying signal and terminating at the trailing edge of the other. The operator selects R according to one of two rules (i) (ii), the, selection being by trial and error: rule (i):, if K(A) > X(B) then R = K(A) if K(A) < K(B) then R = K(B), rule (ii) (which is the converse of rule (i)): if K(A) > K(B) then R = K(B), if K(A) < K(B) then R = K(A). In this manner the …
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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
- Granted February 2, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 2, 2010.
- 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.