US PATENT SUBCLASS 334 / 13
.~.~ Automatic frequency-centering circuit


Current as of: June, 1999
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334 /   HD   TUNERS

11  DF  TUNER UNIT DIRECTLY RESPONSIVE TO VOLTAGE AND/OR CURRENT VARIATION {2}
12  DF  .~ Saturable core-type inductor {1}
13.~.~ Automatic frequency-centering circuit


DEFINITION

Classification: 334/13

(under subclass 12) Subject matter wherein the change in the reactance value of the saturable core type inductance element is controlled by circuit means which is responsive to an undesired change in frequency occurring in the tuned circuit, the circuit means thereby varying the resonant frequency of the tuned circuit a sufficient amount to compensate for the

undesired frequency shift.

SEE OR SEARCH THIS CLASS, SUBCLASS:

16, for automatic frequency controlled tuner circuits having a reactance tuning means.

26+, for automatic frequency centering circuits which have an electromagnetic operator driving the tuning element.

SEE OR SEARCH CLASS

331, Oscillators, appropriate subclasses, particularly 36, for automatic frequency controlled oscillators which may utilize a saturable inductor.