US PATENT SUBCLASS 324 / 76.28
.~.~.~.~ Digital filter

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

76.11  DF  MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46}
76.12  DF  .~ Analysis of complex waves {3}
76.19  DF  .~.~ Frequency spectrum analyzer {7}
77.11  DF  .~.~.~ Nonscanning {5}
76.28.~.~.~.~ Digital filter

DEFINITION

Classification: 324/76.28

Digital filter:

(under subclass 77.11) Subject matter wherein an input signal is operated on by means of digital circuitry to alter the frequency spectrum of the input signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

76.29, for filtering in frequency spectrum analyzers.

76.31, for parallel filters in frequency spectrum analysis.

76.44, for filtering in frequency comparison used to determine the frequency of cyclic current or voltage.

76.68, for filtering in phase comparison used to determine

the frequency of cyclic current or voltage.

SEE OR SEARCH CLASS 333, Wave Transmission Lines and Networks, appropriate subclasses for filters and filtering in wave transmission lines and networks.

702, Data Processing: Measuring, Calibrating, or Testing,

17, for filtering or noise removal in a seismic prospecting system, subclasses 190+ for measured signal extraction or separation (e.g., filtering).