Hi,
There is a method for evaluation the bearing condition called ESP.
What is this abbreviation stands for?
Any Idea or Article about the base theory of this method?

ESP means Envelop Signal Processing
It is the TM name of a method for the evaluation of the bearing conditions used by Diagnostic Instruments
The method looks like every other signal demodulation method.
Perhaps the patent is based on the choice of the available filters

I had some web survey,
Not successful
Iam searching for an article regarding the basic theory or case studies using this method to diagnose bearing faults.