US PATENT SUBCLASS 381 / 343
.~.~.~.~ Phase plug

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}
337  DF  .~ Having acoustic wave modifying structure {5}
339  DF  .~.~ Sound intensifying or spreading element {2}
340  DF  .~.~.~ Horn {3}
343.~.~.~.~ Phase plug

DEFINITION

Classification: 381/343

Phase plug:

(under subclass 340) Subject matter having an element placed within the throat of the horn to optimize the sound propagation.

(1) Note. A phase plug is usually placed in the throat adjacent the diaphragm.