What is pink noise?

I believe pink noise, and white noise, are first of all random noise, like hiss, used for testing electronics and acoustics. I think that pink noise is equal enery per ocatve and white noise is equal energy per decade. For example, pink noise would have the same energy in the 20Hz to 40Hz range as there is from 40Hz to 80Hz. White noise would have the same energy from 20Hz to 200Hz as there is from 200Hz to 2,000Hz. I am sure someone else here can give a better explanation. Please help!

Blueswan sounds about half-right. Pink noise has equal energy per octave. White noise has equal energy at all frequencies.

One virtue of pink noise is that it's an easy way to test frequency response. It's much easier to hear differences in frequency response when listening to pink noise than when listening to music. That's because, in music, there might be little or no energy in the frequency range where the difference occurs, or what energy exists is masked by louder sounds at other frequencies.

On the other hand, pink noise would be a lousy way to test transient response or imaging!

i assume that it's a noise of a pink freequency spectrum. pink is a composite color from red, blue; blue is at the same time is composite color of RGB of a certain intencity. white freequency is usually the composite of all colour freequencies of a highest intencity together.

if we assume that the colour freequency is someway proportional to the audio freequency we can make judgements about the noise behavior in terms of colours.

there can also be maroon, burgundy, yellow, bage, ultramarin, off-white, cyane, navy-blue,... etc... noise.

to tell you the truth i don't yet recognize the noise colors and probably i will need to smoke a joint or do something more serious to realy distinguish ultramarin from for example bage types of noise.

dig it?