what about a second accelerometer, high pass filter, invert the output=20
and apply a proportion of it to the original accelerometer signal like=20
active noise cancelling.  There's a Microchip ap note or reference=20
design about active noise cancelling in a dsPIC

or you might not need the second accelerometer, isolate the vibration=20
frequency and apply the inverse...

Sounds easy but I bet it's not.

Trevor Hancock
--=20
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