US PATENT SUBCLASS 381 / 313
.~ Directional

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

312  DF  HEARING AIDS, ELECTRICAL {9}
313.~ Directional

DEFINITION

Classification: 381/313

Directional:

(under subclass 312) Subject matter where a response of an input transducer (i.e., microphone) to the ambient sound varies significantly with a location of a source relative to the transducer, the hearing aid, or the hearing aid user.

SEE OR SEARCH THIS CLASS, SUBCLASS:

356+, for a directional microphone.