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This question already has an answer here:

Suppose I have a noiseless Signal, which has been filtered with a 2nd order Bessel low pass. I know the filter's transfer function. How can I obtain the unfiltered signal? Thanks!

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marked as duplicate by Andy aka, PlasmaHH, Daniel Grillo, ThreePhaseEel, brhans Dec 8 '16 at 12:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • \$\begingroup\$ Why is this question different to the one you posted a few minutes ago? \$\endgroup\$ – Andy aka Dec 8 '16 at 10:14
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If you know the actual transfer function of the filter then passing the signal through an amplifier with a filter with transfer function equivalent to the original filter in the negative feedback path 'should' return the original signal, subject to any non-idealities encountered along the way.


Written late in a too long day.
Hopefully it will seem as correct in the morning as it does now :-).

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