The determined frequency is then compared with a running average of previous frequency determinations, and {HEAD ~ the drive frequency} of {TAIL ~ the appliance} is adjusted if the difference between the compared frequencies is greater than a threshold value, e.g. 1 Hz 
The determined frequency is then compared with a running average of previous frequency determinations , and { HEAD ~ the drive frequency } of { TAIL ~ the appliance } is adjusted if the difference between the compared frequencies is greater than a threshold value , e.g. 1 Hz
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH