Signal classifier
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United States of America Patent
Stats
-
Oct 7, 1980
Grant Date -
N/A
app pub date -
Apr 11, 1979
filing date -
Apr 11, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signal classifier performs measurements on an IF signal and determines from these measurements the nature of the modulation, if any, appearing on a received high frequency communications signal. The classifier distinguishes between double sideband AM, single sideband suppressed carrier voice AM, ASK, FSK, multi-channel FSK, unmodulated carrier and noise. The measurements include AM variation, the zero crossing rate in detected AM, the percentage of time the detected AM signal level exceeds a given amplitude, and wide and narrow band detected FM.
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