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[sc-dev] SC Filter UGens and Direct Form 2

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Subject: [sc-dev] SC Filter UGens and Direct Form 2
From: superbigio@xxxxxxxxx
Date: Fri, 12 Mar 2021 15:46:09 +0000 (UTC)
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I was skimming through the SC code base and I was suprised to see that all filters in FilterUGens.cpp are implemented using Direct Form II.

As far as I know Direct Form II is not the best choice among the 4 forms (DF1, DF2, TDF1, TDF2), because - although optimal as far as memory storage goes - it is prone to numerical instabilities. Is there a specific reason why all standard SC filters are implemented with DF2 ?

Thanks.

- Luigi Castelli

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