Natural Science Forum / Physics / Acoustics / April 2004

Angelo Campanella <a.campanella@att.net> wrote in news:J%lec.17286
$i74.328737@bgtnsc04-news.ops.worldnet.att.net:

I designed one many years ago that used a long pseudo-random generator as
its source. It used a fairly long pinking filter to create a good fit to
the -3dB/octave frequency response.

This generator is now the product that you can buy from ACO Pacific. I
won't share the circuit, but you might find that ACO's commercial product
might meet your needs.

Jon Dattora (I hope I didn't butcher his name to bad), has an excellent
article in the Journal of Audio Engneering on DSP based Pink Noise
Generators. This article was published in the last few years.  

Angelo,

generator should suit. <

I have exactly what you want. Look for "Spectrum Analyzer and Equalizer
Design," about halfway down the list on my Articles page:

www.ethanwiner.com/articles.html

And here's a direct link to just the GIF file schematic:

www.ethanwiner.com/spect-2.jpg

There's even a special 3 dB/octave filter to derive the correct pink noise
shaping.

--Ethan