[sdiy] Handy DIY tip #213/noise color

[Tim Parkhurst]

Wow, thanks! Yes, it makes sense now. GREAT explanation.

Tim Servo
"Imagination is more important than knowlege." - Albert Einstein
 
*************************************
> -----Original Message-----
> From: Magnus Danielson [mailto:cfmd at swipnet.se]
> 
> White noise has equal energy over frequencies, i.e. if you used say a 1 Hz
> bandpass filter, whatever center frequency you pick up, the same RMS value
> you
> would read.
> 
> Pink noise has equal energy over octaves, i.e. over a one octave range you
> have the same energy as over any other octave. Since an octave ranges more
> frequencies at higher frequencies, the energy per frequency must be lower.
> The math comes out such that when viewed in frequency you have a slope of
> -3 dB
> per octave in relation to the white noise, since the white noise is
> perceived
> to "rise" 3 dB per octave, but it isn't, it's just that it's the doubled
> frequencies per octave, and double frequency means doubled energy, and
> that
> means +3 dB per octave.
> 
> Doing a - 3dB per octave filter is "unnatural" so it becomes quite ugly
> actually.
> 
> Did it make sense?
> 



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