When the first number of {TAIL ~ shock events} exceeds an upper event threshold, a control signal is adjusted in order to adjust a frequency spectrum of {HEAD ~ noise} affecting the shock detector 
When the first number of { TAIL ~ shock events } exceeds an upper event threshold , a control signal is adjusted in order to adjust a frequency spectrum of { HEAD ~ noise } affecting the shock detector
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH