Ok, I had asked this question in the DSP newsgroup and in a German one because there used to be a lot of academic activity regarding wave digital filters over there. Seems to have fizzled a bit though. Anyway, I did not get very far.
Is there any simple software that can calculate the architecture and most of all the coefficients for wave digital filters (WDF)? Maybe even some kind of Excel routine? Maybe a book with a CD?
Background: Many moons ago I bought a DOS program that can do that. However, it is lacking in two important areas: I can't easily play with the coefficient granularity to see what the stop band behavior would be afterwards, and staggered-decimation filters are next to impossible. This is important when you have to make do with a processor of limited horse power that does not contain a multiplier. Secondly, with this SW one has to pick from a common architecture (Bessel, Butterworth, Chebychev, Cauer etc.), none of the more esoteric stuff.