AFT arrangement for a double conversion tuner

Details AFT arrangement for a double conversion tuner AFT arrangement for a double conversion tuner

1983-04-28

1986-03-11

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581951, 455182, 455315, 455316, H04N 544, H04B 126

Patent

active

045757615

ABSTRACT:
A double conversion tuner stabilized against drift includes a first local oscillator included in a phase locked loop (PLL) and a second local oscillator included in an automatic fine tuning (AFT) loop. A switching arrangement selectively allows the AFT signal to control the second local oscillator only when the operation of the PLL has been completed and if the picture carrier of the IF signal produced at the output of the tuner is within the AFT control range to prevent the second local oscillator from being tuned incorrectly.

REFERENCES:
patent: 3619492 (1971-11-01), Evans
patent: 4031549 (1977-06-01), Rast et al.
patent: 4322856 (1982-03-01), Ohta et al.
patent: 4340974 (1982-07-01), Cooke et al.
patent: 4352209 (1982-09-01), Ma
patent: 4357632 (1982-11-01), French
patent: 4402089 (1983-08-01), Knight
patent: 4408348 (1983-10-01), Theriault
"An Experimental Parametric Tuner for UHF Television Receivers" by L. A. Harwood and T. Murakami appearing in RCA Review Magazine, Jun. 1963, pp. 253-281.

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