[music-dsp] I found source to a useful program

[Joshua Scholar]

There's a filter design applet at
http://www.isip.msstate.edu/projects/speech/software/demonstrations/applets/util/filter_design/current/doc/tutorial.html

Those of you who've already seen it might think it's not so useful because
it doesn't factor filters into stages and only prints 4 places of the
decimal - that isn't enough for a high order IIR filter in that form.

However the source code is available online.  I found that placing it in the
directory the .sh file expects and using Cygwin, I can alter
FilterCoefficient.java to print more places and recompile.

Also the source looks quite usable.  There isn't anything written about a
license, so I should write the professor before using his code...

The code can design:
Five kinds of high pass, low pass and band pass filters (Butterworth,
Bessel, Chebyshev , Elliptic and Kaiser), a simple all pass, a
Parks-McClellan seven band parametric equalizer, a simple band-boost and
some sort of LPC designed filter...  You can specify the order of the filter
or in some cases it can pick the order that best matches your requirements.