AFT Circuit

Details AFT Circuit AFT Circuit

1978-10-30

1982-03-23

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455261, H04N 550

Patent

active

043216242

ABSTRACT:
An automatic fine tuning (AFT) circuit is provided which generates an AFT control signal in response to a video intermedate frequency (I.F.) signal. The I.F. signal is supplied to the input of a current source amplifier, which provides current signals of like phase relationship to a discriminator network. The discriminator network is comprised of two tuned circuits, one of which is resonant at a frequency below the desired frequency of the I.F. picture carrier, and the other resonant at a frequency above the desired frequency. The tuned circuits develop voltage variations which vary differentially in magnitude in response to the frequency deviation of the I.F. picture carrier from its desired frequency. The differentially related voltages are detected by two peak detector networks for use as AFT control signals. The current source amplifier and peak detector networks may be conveniently fabricated on a single I.C. chip. The tuned circuits are coupled to the current source amplifier and peak detector networks through two external I.C. terminals.

REFERENCES:
patent: 3444477 (1969-05-01), Avins
patent: 3502988 (1970-03-01), Shelby

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