Automatic fine tuning circuit for processing an image intermedia

Details Automatic fine tuning circuit for processing an image intermedia Automatic fine tuning circuit for processing an image intermedia

1995-07-13

1996-10-01

Peng, John K.

Television

Receiver circuitry

Automatic frequency control

348733, 4551822, 4551922, H04N 950

Patent

active

055614795

ABSTRACT:
An automatic fine tuning (AFT) circuit used for processing an image intermediate frequency signal for a video display device. The AFT circuit, which produces an automatic fine tuning signal, by which an image intermediate frequency signal maintains a constant carrier center frequency, includes a phase shift device for performing a phase shift of 90.degree. in the state of the constant carrier center frequency, a control current generating device for generating a control current in response to a variation of a variable resistor value, a resonant frequency variable device for varying a resonant frequency of the resonance circuit, by varying a capacitance to be resonated by the control current, and a phase detecting device for multiplying the image intermediate frequency signal by a phase-shifted image intermediate frequency signal, and for generating the automatic fine tuning signal. According to one aspect of the AFT circuit, the phase shift device includes a resonance circuit for performing the phase shift in relation to the image intermediate frequency signal.

REFERENCES:
patent: 4220974 (1980-09-01), Craft
patent: 4283792 (1981-08-01), Hongu et al.
patent: 4731872 (1988-03-01), Washburn, Jr.
patent: 4843636 (1988-03-01), Hendricks et al.

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