US PATENT SUBCLASS 708 / 312
.~.~.~.~ Tone 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  DF  .~.~.~ Frequency detection {1}
312.~.~.~.~ Tone detection


DEFINITION

Classification: 708/312

Tone detection:

(under subclass 310) Subject matter where the subset consists of a single frequency.