The excursion signal generator identifies {HEAD ~ a peak portion} of {TAIL ~ a signal} exceeding a threshold, such as a magnitude threshold 
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The excursion signal generator identifies { HEAD ~ a peak portion } of { TAIL ~ a signal } exceeding a threshold , such as a magnitude threshold
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH