Television receiver operable in exact or extended range tuning m

Details Television receiver operable in exact or extended range tuning m Television receiver operable in exact or extended range tuning m

1974-10-03

1976-03-23

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

325421, H04N 550

Patent

active

039461483

ABSTRACT:
A color television receiver has a tuner converting the received signal to an intermediate frequency and fine tuning means for varying the converted frequency. An intermediate frequency filter couples the converted signal to a synchronous demodulator which includes a variable frequency reference oscillator in a closed loop control system which tracks the IF frequency thereby providing an extended range of tuning adjustment. A two pole switch is operable to couple the DC component of the closed loop control system error signal to the tuner and the AC component of the error signal to the reference oscillator thereby providing an "exact tuning" operation.

REFERENCES:
patent: 3454710 (1969-07-01), Gassmann
patent: 3750029 (1973-07-01), Baars
patent: 3760094 (1973-09-01), Skerlos
patent: 3787612 (1974-01-01), De Vries et al.

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