Automatic frequency control apparatus for television receivers

Details Automatic frequency control apparatus for television receivers Automatic frequency control apparatus for television receivers

H - Electricity

04

N

350/92

H04N 5/50 (2006.01) H03J 7/04 (2006.01)

Patent

CA 1094679

AUTOMATIC FREQUENCY CONTROL APPARATUS FOR TELEVISION RECEIVER ABSTRACT OF THE DISCLOSURE An automatic local oscillation frequency control apparatus for a television receiver is disclosed, wherein a video intermediate frequency (VIF) signal is applied to an FM discriminator for generating an AFC voltage through a phase shifter comprised of a serial-parallel resonance circuit, and one of serial resonance frequency and parallel resonance frequency of the serial-parallel resonance circuit is selected to be a frequency near a picture carrier frequency while the other is selected to be a frequency which is made by subtracting one half of a differential frequency between the picture carrier frequency and a sound carrier frequency from the picture carrier frequency. The present apparatus can attain automatic frequency control with a wide pull-in range and a wide hold range.

296187

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