US PATENT SUBCLASS 455 / 213
.~.~.~ Using specified filter

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
205  DF  .~ Frequency or phase modulation {7}
212  DF  .~.~ With squelch or other audio output silencing {1}
213.~.~.~ Using specified filter

DEFINITION

Classification: 455/213

Using specified filter:

(under subclass 212) Subject matter in which the squelch or silencing action, or its reverse, is determined by a frequency discriminating means, specifically recited.

(1) Note. The filter means may be high, low, or band pass or reject.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

552+, for miscellaneous unwanted signal suppression utilizing an active filter.