US PATENT SUBCLASS 327 / 555
.~.~.~.~ Selective type signal filtering (e.g., from low pass to high pass, etc.)

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

524  DF  SPECIFIC IDENTIFIABLE DEVICE, CIRCUIT, OR SYSTEM {22}
551  DF  .~ Unwanted signal suppression {1}
552  DF  .~.~ Active filter {5}
553  DF  .~.~.~ Adjustable {2}
555.~.~.~.~ Selective type signal filtering (e.g., from low pass to high pass, etc.)

DEFINITION

Classification: 327/555

Selective type signal filtering (e.g., from low pass to high pass, etc.):

(under subclass 553) Subject matter wherein different types of signal filtering are selected by an applied control signal.

(1) Note. The filter can be changed from one permitting low frequency signals to flow through to one that only permits high frequency signals to pass, (e.g.., low pass to high pass filtering).