Hi,
I have a question about anti-aliasing filters which I thought would fit i
this discussion thread.
I have an RC circuit and my ultimate goal is to estimate the value of th
capacitor using least square estimation. In order to carry out thi
estimation I need to discretize the system transfer function and find th
ARMA model, however to do that I need to use an anti-aliasing filter firs
to make the transfer function bandlimited.
I tried using a Butterworth filter, which does very well is preserving th
magnitude response of the system however the phase is really not preserve
and since I'm trying to estimate the value of the capacitor in the system
thought preserving the phase is important for my estimation purposes.
However I am now not certain any more.
So my question is how do I know if preserving phase is important in a
application or not? and if it is what is the best anti-aliasing filter tha
would preserve phase?
thanks