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