Brown Noise

Created by Aetmos
 
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The graphic representation of the sound signal mimics a Brownian pattern. Its spectral density is proportional to 1/f2, meaning it has more energy at lower frequencies, even more so than pink noise. It decreases in power by 6 dB per octave and, when heard, has a "damped" or "soft" quality compared to white and pink noise. See also purple noise, which is a 6 dB increase per octave.