Automatic frequency control apparatus for television receiver

Details Automatic frequency control apparatus for television receiver Automatic frequency control apparatus for television receiver

1978-02-02

1979-06-12

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

331 32, H04N 550, H03B 304

Patent

active

041582110

ABSTRACT:
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 the serial resonance frequency and the 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 an automatic frequency control having a wide pull-in range and a wide hold range.

REFERENCES:
patent: 3842198 (1974-10-01), Martin
patent: 3940554 (1976-02-01), Masuda
patent: 4091421 (1978-05-01), Long

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