You don't actually require a special "machine" to produce brown noise. Brown noise is simply noise with a spectral density of 1/f^2, such that lower frequencies have the most power and the power falls off exponentially at higher frequencies. (Note: The attached picture uses a logarithmic scale for frequency, so it makes the spectral power band appear linear. -It isn't linear, it's 1/f^2.)

You can get pre-generated audio files of brown noise (named after Robert Brown, the discoverer of Brownian Motion, not after the color) from http://www.simplynoise.com, and either play them on an MP3 player, or burn them to CD and play them on a stereo system.

Audible brown noise sounds like hiss with a strong bass end, not unlike rain in a thunderstorm.
Source(s):
http://en.wikipedia.org/wiki/Brown_noise


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