Measurement of subcarrier to horizontal sync phase using a vectorscope
CA 1250043 A · Owner: Tektronix, Inc. · Inventors: Matney, Earl G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit for use with a vectorscope to indicate SC/H phase of a composite video signal comprises an oscillator for generating a continuous wave signal at subcarrier frequency and having its phase locked to the horizontal sync point of the video signal, and a switch for connection between the output terminal of the filter of the vectorscope and the second inputs of the demodulators of the vectorscope and for connection also to the oscillator, for alternately connecting the subcarrier burst from the filter of the vectorscope and the sync locked continuous wave from the oscillator to the demodulators. When the subcarrier burst is connected to the demodulators, the vectorscope provides an …
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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 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 2006.
- 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
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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.