US PATENT SUBCLASS 381 / 360
.~.~ Cavity

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

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
355  DF  .~ Housed microphone {4}
360.~.~ Cavity

DEFINITION

Classification: 381/360

Cavity:

(under subclass 355) Subject matter including a resonant acoustic space or similar structure designed to affect the acoustic characteristics of a microphone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

345, for acoustic enclosure in acoustic wave modifying structure.