Automatic fine tuning circuit
CA 1064580 A · Owner: Sony Corporation · Inventors: Isono, Katsuo; Morita, Kouji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A relatively broad band automatic fine tuning circuit covering a frequency band at least approximately as broad as a television channel and including means to shift the frequency of the television tuner up or down as necessary, to the proper frequency within the automatic tuning range. A first control signal is obtained by comparing the average value of the envelope detected signal from the video detector with a voltage equal to the pedestal level if the signal were a properly tuned video signal. If the actual average value of the envelope is between zero volts and the pedestal voltage, the tuner is either correctly tuned or tuned at a somewhat lower frequency than is correct. If 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 October 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 1996.
- 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.