Automatic fine tuning circuit

Details Automatic fine tuning circuit Automatic fine tuning circuit

H - Electricity

04

N

325/110, 365/14

H04N 5/50 (2006.01) H03J 5/00 (2006.01) H03J 5/02 (2006.01) H03J 7/02 (2006.01) H03J 7/06 (2006.01) H04B 1/26 (2006.01)

Patent

CA 1064580

ABSTRACT OF THE DISCLOSURE 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 pedes- tal voltage, the tuner is either correctly tuned or tuned at a somewhat lower frequency than is correct. If the voltage average value has a greater magnitude than the pedes- tal voltage the tuning of the tuner is too high. A frequency discriminator receiving the video IF signal controls the automatic tuning operation close to the desire frequency. A noise detector in the audio circuit controls a muting cir- cuit to disable AFT operation if the receiver is so far out of tune as to receive noise instead of an audio signal.

268509

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