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IIR Filters

Hello.  I am switching from PV-Wave over to the current release of IDL.
been a wave coder since version 0.6, I can appreciate the development
of IDL.

However.  Wave has a nice set of routines for IIR filter design and
applications.  These
are very important for our work because IIR filters can be causal, differing
FFT and FIR techniques.

Does anyone know of IIR stuff for IDL?  I do not want to write from scratch
suggested in the IDL documentation.

Searching the libaries on the web produces nothing.


Ed May