{HEAD ~ The determined frequency} is then compared with {TAIL ~ a running average} of previous frequency determinations, and 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 
is compared with
{ HEAD ~ The determined frequency } is then compared with { TAIL ~ a running average } of previous frequency determinations , and 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 REL OTH REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH