US PATENT SUBCLASS 455 / 67.3
.~.~ Noise, distortion or unwanted signal detection (e.g., quality control, etc.)

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
67.1  DF  .~ With measuring, testing, or monitoring of system or part {6}
67.3.~.~ Noise, distortion or unwanted signal detection (e.g., quality control, etc.)

DEFINITION

Classification: 455/67.3

Noise, distortion or unwanted signal detection (e.g. quality control, etc.):

(under subclass 67.1) Subject matter having means to detect any undesired electrical disturbance within the useful frequency band arising from sources internal or external to the system (e.g., crosstalk, power induction, atmospheric noise, etc.); or any undesired self-sustained oscillation existing in the system; or other unwanted signals tending to interfere with the operation of the system.