Embodiments of the present invention can include the steps of (i)
filtering the indicated flow to derive an intermediate filtered indicated
flow, (ii) deriving a weighted first derivative of the intermediate
filtered indicated flow, and (iii) outputting a filtered indicated flow
comprising the sum of the intermediate filtered indicated flow and the
weighted first derivative of the intermediate filtered indicated flow.
The indicated flow can be filtered using a FIR, an IIR a running average
or other filtering scheme.