[SqueakAudio] Generating "Soothing Sounds"

[John.Maloney@disney.com]

Mark,

I don't know how these gadgets work, but I suspect you could make
a "pink" noise generator in Squeak fairly easily. The plan would
be to use a cheap random generator to create "white" noise, then
filter it to create "pink" noise with the desired spectrum. The
design problem reduces to coming up with a pleasing spectrum.

The next level of sophistication would be to use a tunable
filter whose center frequency wanders about over a certain range.

Mind you, I don't know enough about digital filter design to
do this myself. But if you know a EE, they've may have a basic
DSP textbook that would tell you how. This is the kind of thing
that would be a snap to prototype in CSound or Kyma...

	-- John


At 1:18 PM -0500 2/21/00, Mark Guzdial wrote:
>I was wondering something this weekend, and thought that maybe this 
>list might have the folk who can point me toward my answer -- though 
>the question is not exactly the main focus of this list.
>
>During a particularly child-noisy point this weekend, I got to 
>thinking about those "pleasant sound" generating gadgets that I see 
>in the stores these days: The ones that generate the sound of falling 
>rain, or whatever.
>
>- How do these work?  Are they just playing samples over and over 
>(perhaps in different orders)?  Or are they actually synthesizing the 
>sounds?
>
>- If the latter, does anyone have any sample code that can do this 
>kind of synthesis?  My preference is for Squeak code, please, but 
>understandable pseudo-code, MATLAB/MATHEMATICA, or even C code would 
>be interesting.
>
>Thanks!
>  Mark