[sdiy] Akai S612 filter/schematics

[Theo]

Don't think your distribution is pink.
If memory doesn't fail, pink is 3dB LP filtered white noise (cutoff at 0hz)
Anyways don't think your code was buggy, compare this to playing a melody
"filled in".
Full chords, the top note the melody note, all notes playing equal loud.
You still will "hear" the melody and not 4 or 5 equal counterpoint lines as
the highest pitch gets priority in your perception.

Theo



From: Andre Majorel <amajorel at teaser.fr>

> On 2002-04-17 16:05 +0200, Joris wrote:
>
> > Btw from the data sheets ( http://www.national.com/ds/MF/MF6.pdf ) it
> > seems like there is no resonance peak in these lowpass filters, but my
> > ears tell me there *is*. Any thoughts on this?
>
> Not sure, but... I once generated band-limited pink noise by
> adding sines with random frequencies between two frequencies one
> octave apart, with a pink distribution. Unless there was a bug
> in my program, its output would have looked like this on a
> spectrum analyser :
>
>            ______
>                               Amplitude vs. log of frequency
>   _________      ________
>
> The top end of the band was like a low pass filter with vertical
> slope (infinite dB/oct), and no resonance. And yet it sounded to
> me like there was a peak around the cutoff frequency.
>
> So either there was a bug in my program or this is the audio
> equivalent of an optical illusion, a psychoacoustic illusion.
>
> --
> André Majorel <URL:http://www.teaser.fr/~amajorel/>
> std::disclaimer ("Not speaking for my employer");