US PATENT SUBCLASS 381 / FOR 129
.~ Frequency control (381/68.2)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 129.~ Frequency control (381/68.2)

DEFINITION

Classification: 381/FOR.129

Frequency control:

Subject matter including a circuit to control the amplitude of the hearing aid as a function of the frequency.