US PATENT SUBCLASS 381 / 98
INCLUDING FREQUENCY CONTROL

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

98INCLUDING FREQUENCY CONTROL {3}
99  DF  .~> Having crossover filter {1}
101  DF  .~> Automatic tone control {1}
103  DF  .~> Having automatic equalizer circuit

DEFINITION

Classification: 381/98

INCLUDING FREQUENCY CONTROL:

(under the class definition) Subject matter with means to vary or maintain the frequency response of the system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62, for vibrato effects.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

165, 212 for filters, per se.

455, Telecommunications,

255+, 266 and 268 for frequency response control in radio receivers.