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<p>The quick and dirty way is just to feed the filter white noise and plot
the output signal's spectrum. Guaranteed to show the actual
performance of the filter, and not somebody's idea of how it ought to be
working.</p>
<p>If you need a theoretical curve, I'd start with a look at the [bp~]
source to see if you can extract some hints about how the filter is
implemented. It may be quite easy to figure out the poles and zeros
if the code is clear and/or documented.</p>
<p>Good luck! <br>
Bill Gribble<br>
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