Quote:
Originally Posted by Robert Randolph
So, how do we know that Fuzzmeasure's plot isn't incorrect?
What's the predicted phase response for this filter?
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Fuzzmeasure gives me consistent measurements with various (brand) filters and seems to be in sync with "ideal" plots. (seems to work fine for IIR filters.) theres a bunch of stuff you can check/make plots for PC, but i am mac so i use what i can get. R.E.W. gives me the same plots.
the filter is a 12 dB Butterworth filter, so you can probably find a bode plot somewhere for the ideal phase response. or even the math.
but like i said, the important thing to note here is for this type of filter's phase response, the corner is at 90 degrees...ReaEQ (with butters Q) shows it at 180.