[sdiy] Talking of Q

[David G. Dixon]

> > > If there's a simpler way to understand filter behaviour, 
> > then I haven't
> > > found it.
> > 
> > Yes - install wxMaxima and let the computer slog through the algebra
> > and plotting for you!
> 
> Cheater!  ;^)

...but, in all seriousness, you don't learn nearly as much that way.
There's a certain value in suffering through at least one full-blown
analysis on your own, by hand.  After that, you've earned the right to use
the computer tools.  Otherwise, you'll never really know what's going on.
Plus, it's kinda fun to work through a problem like that and get the right
answer, all by yourself -- to "slay the beast" as it were.  It can cast
mathematics in a much less scary light.