A method that calculates a threshold for a signal according to a first bandwidth
if the signal is greater than the threshold plus a first value or if the signal
is less than the threshold minus the first value. The method also calculates the
threshold for the signal according to a second bandwidth if the signal is not greater
than the threshold plus the first value and if the signal is not less than the
threshold minus the first value. The first bandwidth is greater than the second
bandwidth. Various apparati that perform the method are also described.
