On 2/22/2010 8:16 AM, Invisible wrote:
> Go here:
>
> http://www.falstad.com/mathphysics.html
>

Something that should be on any geek's bookmarks list!

> Scroll down to "signal processing".
>
> They have two applets. One lets you draw an arbitrary waveform and see
> its Fourier series, draw an arbitrary Fourier series and let you see its
> waveform, and listen to the result in either case.
>
> They also have a little DSP applet which will let you play [literally!]
> with any kind of FIR or IIR filter known to mankind - not just the usual
> type-I Chebyshev filter, but also type-II, for example. See and hear in
> realtime, tweak the parameters, and so forth.

Yep! These applets are quite fun indeed! I've burned many hours playing 
with them.

> That single page also has links to a ridiculous number of other
> addictive applets, like wavetank simulators, circuit simulators, and God
> only knows what else. You might not leave for several hours.

I've actually begun poking around in the source code of the circuit 
sim.... Generally well-written stuff, very organized and easy to 
understand. Not a whole lot of comments though.

I've had a couple of e-mail exchanges with the author. All around nice guy!

-- 
~Mike

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