US PATENT SUBCLASS 381 / 356
.~.~ Directional

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}
356.~.~ Directional {1}
357  DF  .~.~.~> With plural sound ports (e.g., pressure gradient) {1}

DEFINITION

Classification: 381/356

Directional:

(under subclass 355) Subject matter acoustically or mechanically configured to have a different response to sounds emanating from different locations in an environment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

92, for a circuit for imparting directional pickup characteristics to a microphone.

313, for directional hearing aids.