[sdiy] Starting a Four Pole Filter in an FPGA.....
ajhuovil at cc.hut.fi
Sun Nov 2 17:57:22 CET 2008
On Sun, 2 Nov 2008, Jim Patchell wrote:
> Thanks for the links...if nothing else...they are both very
> interesting...and hopefully, I will find something very useful at one of
> those....the musicdsp site looks particularly good...
Sadly almost every non-trivial piece of code on the site is at least
subtly wrong (most are not so subtly).
The following is better pseudocode for Moog-like filter than most you
find on the net: http://users.tkk.fi/~ajhuovil/moog.txt
Real Moog emulation has tanh nonlinearities in different places making it
harder to implement for a novice.
A and B constants can be replaced by A = 0.75 and B = 0.25 with slight
changes to tuning and feedback correction polynomials.
"No boom today. Boom tomorrow. There's always a boom tomorrow"
-- Lt. Cmdr. Ivanova
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