US PATENT SUBCLASS 381 / 99
.~ Having crossover filter

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.~ Having crossover filter {1}
100  DF  .~.~> With active device

DEFINITION

Classification: 381/99

Having crossover filter:

(under subclass 98) Subject matter that separates a signal into two or more separate frequency bands.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

132+, for crossover networks, per se.

369, Dynamic Information Storage or Retrieval,

175, for record players with frequency dependent signal separation.