Invisible wrote:
>>> You may also find this interesting:
>>>
>>> http://www.falstad.com/dfilter/
>>
>> I like this the best.. Such fun messing with the filters. FWIW, I now 
>> know why the Chebyshev can be called resonant.
> 
> And WHO SAID that physics is borig, eh? ;-) Seems pretty fun to me...
> 
> I'll have to throw together a toy for displaying the transfer function 
> in 3D. ;-)

I quite enjoy falstad's Java applets...

Interestingly the IIR filters can also be created with an analog circuit 
(using the very same poles and zeros, in fact) . I think I seriously 
annoyed my wife with the filtering applet. ;)

Its kind of nice knowing enough to predict what will happen when moving 
a pole or a zero on the chart (Custom IIR)

Interestingly modern computers are fast enough to run an arbitrary FIR 
filter with little (actually no) trouble. Though I imagine the reason 
the MT32 emulator went IIR is twofold: 1. It approximates rather closely 
the original analog filter in the real device, 2. 32 channels of audio 
need to be filtered simultaneously in real time. IIR is vastly faster.

Why do I keep bringing up the MT32 emu? It was the first DSP project I 
ever played with the source code to. I'm familiar with it, and I 
understand the hardware.


-- 
~Mike

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