There is something about pythons filter design that I am misunderstanding completely. I am getting iir filters with feedback coefficients that have values like 10e20 which makes no sense.

I suspect it is a format problem, but I haven't found any info about it yet.

I a musing scipy, which is very nice, but I can't figure out how to get the coefficients into a form I can use in anything else.

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I am just really confused now. These feedback coefficients should give an impulse response that increases exponentially, but the impulse response is a nice decaying exponential like I expect when using the python filter functions.

There has to be some number formatting thing I am missing.

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