US PATENT SUBCLASS 327 / 47
.~.~ Frequency detection

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

1  DF  SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL {11}
39  DF  .~ By frequency {3}
47.~.~ Frequency detection {2}
48  DF  .~.~.~> With counting
49  DF  .~.~.~> With logic or bistable circuit

DEFINITION

Classification: 327/47

Frequency detection:

(under subclass 39) Subject matter wherein an output signal is present or changes only at a predetermined input frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102, for the conversion of input frequency to output current or voltage.

113+, for frequency or repetition rate control.

552+, for unwanted signal elimination by an active filter.

SEE OR SEARCH CLASS

379, Telephonic Communications,

346, for a repeater with voice frequency discriminator. 708, Electrical Computers: Arithmetic Processing and Calculating,

311+, for frequency detection/filtering using an electrical digital calculating computer.