(under subclass 723) Subject matter wherein the harmonic content of a note is controlled or modified.
SEE OR SEARCH THIS CLASS, SUBCLASS:
622, for tone synthesis or timbre control with digital storage.
659, for tone synthesis or timbre control with digital combinational circuit.
692, for tone synthesis or timbre control with electric analog oscillators.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems, 3, for circuits in which different frequencies are superimposed; subclasses 106+ for waveform or waveshape determinative systems.
310, Electrical Generator or Motor Structure, appropriate subclasses for dynamoelectric frequency changers.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
100+, for miscellaneous signal converting, shaping, or generating, and particularly subclasses 113+ for miscellaneous harmonic generators.
331, Oscillators, appropriate subclasses for general harmonic generators.
333, Wave Transmission Lines and Networks,
28, for audio tone controls.
363, Electric Power Conversion Systems,
157+, for electric power frequency conversion systems.
381, Electrical Audio Signal Processing Systems and Devices,
101, for automatic tone control; subclass 118 for signal processing of musical instruments, per se; subclasses 101 through 103 for automatic tone control or equalization of audio signals.
