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Pink noise

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Noise which has been filtered so that it has equal energy in every octave. White noise has the same average energy at every frequency, but since each octave is twice as wide (in terms of the frequency difference between the low end and the high end of the octave) as the octave preceding it, the total energy contained in each octave goes up at a rate of 3 dB per octave as the frequency increases. Pink noise is filered to eliminate this rise. As a result, if pink noise is subject to spectrum analysis, the result is a flat line.Because of the reduced high frequency content, pink noise sounds somewhat less hissy and more bland than white noise.

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