Assuming you want to measure the frequency, I would use this method, but I
like to take several samples, then implement a median filter in code to
reject any left-over junk. Then I would average the cleaned samples to get a
result.

> Amplify whatever's "left-over" after the filter and rail-to-rail (or
> even clip) the output from 0v to 5v with another op-amp
> circuit if need
> be and add clamping diodes and just count the pulses
> and average,
> etc... using an interrupt routine on a standard input pin.
>

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