US PATENT SUBCLASS 381 / FOR 128
.~ Directional (381/68.1)

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

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 128.~ Directional (381/68.1)

DEFINITION

Classification: 381/FOR.128

Directional:

Subject matter where the response of an input transducer (i.e., microphone to the ambient sound varies significantly with the direction of incidence of the sound.