Provides brick wall type minimalisation of
spurious low frequency phenomena that may
otherwise invalidate data from piezo-electric
sources. Supposed vibration acceleration signals
may contain thermal and strain induced noise
elements, both constrained to the low frequency
end of the spectrum by reason of thermal mass
and the 1/fo
2 relationship between acceleration vs.
displacement respectively.
The filter of course acts as the boundary fo,
between valid data (>fo) and this type of noise.
