US PATENT SUBCLASS 84 / 661
.~.~.~.~ Filtering

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
600  DF  .~ Electrical musical tone generation {5}
647  DF  .~.~ Digital combinational circuit {7}
659  DF  .~.~.~ Tone synthesis or timbre control {2}
661.~.~.~.~ Filtering

DEFINITION

Classification: 84/661

Filtering:

(under subclass 659) Subject matter wherein a desired waveform is obtained by removing one or more partials or harmonics.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

105+, for harmonic filter or neutralizer.

333, Wave Transmission Lines and Networks,

186, for electromechanical filters using lumped parameters.

708, Electrical Computers: Arithmetic Processing and Calculating, 300+, for digital filtering by a calculating computer.