US PATENT SUBCLASS 381 / 71.7
.~ Particular transducer or enclosure structure

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

71.1  DF  ACOUSTICAL NOISE OR SOUND CANCELLATION {7}
71.7.~ Particular transducer or enclosure structure

DEFINITION

Classification: 381/71.7

Particular transducer or enclosure structure:

(under subclass 71.1) Subject matter specifying details of an

electro-acoustic energy converter or housing for use in an active noise cancellation system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

88+, for enclosure or housing.

150+, for electro-acoustic audio transducer.