US PATENT SUBCLASS 381 / 58
MONITORING/MEASURING OF AUDIO DEVICES

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

58MONITORING/MEASURING OF AUDIO DEVICES {2}
59  DF  .~> Loudspeaker operation
60  DF  .~> Testing of hearing aids

DEFINITION

Classification: 381/58

MONITORING/MEASURING OF AUDIO DEVICES:

(under the class definition) Subject matter having an indicator, measuring device, or eavesdropping means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

56+, for monitoring of sound waves.

SEE OR SEARCH CLASS

340, Communications: Electrical,

500+, for condition responsive alarms.

714, Error Detection/Correction and Fault Detection/Recovery,

712+, for testing transmission facilities.