Method of and apparatus for tuning an aft-controlled electronic

Details Method of and apparatus for tuning an aft-controlled electronic Method of and apparatus for tuning an aft-controlled electronic

1976-11-10

1978-11-28

Griffin, Robert L.

325464, H04B 116

Patent

active

041278186

ABSTRACT:
A method of and apparatus for tuning an electronic tuner of the type having a voltage-controlled tuning element to which a selected control voltage is applied, thereby tuning the electronic tuner to a corresponding frequency, the tuner additionally including an automatic fine tuning circuit which is operable even when a control voltage first is applied to the voltage-controlled tuning element. When the control voltage first is applied, generally it experiences a gradual increase in magnitude until its predetermined control voltage level is attained. The automatic fine tuning circuit may pull in a frequency corresponding to the instantaneous level of the control voltage during the gradual increase in magnitude thereof. To avoid tuning the electronic tuner to this pulled-in frequency, the selected control voltage is re-applied to the tuning element at a predetermined time subsequent to the initial application of such control voltage.
In a preferred embodiment, the electronic tuner is a programmable tuner provided with a storage device wherein representations, such as digital representations, of desired frequencies are stored. The tuner is tuned to one of these frequencies by reading out a selected representation, converting the representation to a corresponding control voltage and then applying this voltage to the voltage-controlled tuning element. The automatic fine tuning operation serves to modify the read-out representation, and thus the converted control voltage, to correspond to a pulled-in frequency. The selected control voltage is re-applied to the tuning element by reading out once again the selected representation from the storage device.

REFERENCES:
patent: 3889193 (1975-06-01), Sasaki et al.
patent: 3906351 (1975-09-01), Evans
patent: 3906372 (1975-09-01), Schatter et al.
patent: 3968440 (1976-07-01), Ehni
patent: 3988681 (1976-10-01), Schurmann
patent: 4004231 (1977-01-01), Elshuber et al.

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