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Need to design digital filter


Is there a currently-maintained signals and systems package, or
perhaps a signal processing package?

Specifically, I have a need to design a few digital filters. I
definitely need Butterworth type and possibly elliptic type. But my
application is weird in that I need a low pass filter with a _very_
narrow passband, for which Octave generates unstable filters. I
suspect numerical problems and thus could possibly benefit from
Mathematica's ability to do symbolic computation and then compute the
numerical results with extra precision.

I will do the filtering in another (non-Mathematica) program--I need
only poles or coefficients for a cascade of second-order sections.

Thanks,
Jerry



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