US PATENT SUBCLASS 381 / 100
.~.~ With active device


Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

98  DF  INCLUDING FREQUENCY CONTROL {3}
99  DF  .~ Having crossover filter {1}
100.~.~ With active device


DEFINITION

Classification: 381/100

With active device:

(under subclass 99) Subject matter having an electrical or electronic element capable of controlling voltages or

currents to produce gain or switching action in a circuit (e.g., transistor, vacuum tube, or saturable reactor).