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Noise is a random, unpitched signal that, at audio rates, can sound like hissing or the wind. Pink noise has equal energy (sound level) per octave. As each higher octave has double the frequency of the octave below it which spreads out the energy over a wider range of frequencies, pink noise tends have a more natural, less electronic sound with more bass and less high end – especially when compared to white noise, which has an equal energy per number of hertz (frequency) and therefore tends to sound very bright.

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