US PATENT SUBCLASS 708 / 311
.~.~.~ Frequency detection

Current as of: June, 1999
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708 /   HD   ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING

100  DF  ELECTRICAL DIGITAL CALCULATING COMPUTER {10}
200  DF  .~ Particular function performed {26}
300  DF  .~.~ Filtering {20}
311.~.~.~ Frequency detection {1}
312  DF  .~.~.~.~> Tone detection

DEFINITION

Classification: 708/311

Frequency detection:

(under subclass 300) Subject matter in which a subset of frequencies from a known set of possible frequencies is determined to be present.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

39+, for discriminating by frequency.