US PATENT SUBCLASS 455 / 221
.~.~ Audio responsive

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
218  DF  .~ Squelch {5}
221.~.~ Audio responsive

DEFINITION

Classification: 455/221

Audio responsive:

(under subclass 218) Subject matter where the level of input signal characteristic at which the squelch will operate is operator variable.