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