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pink noise

noun
1.
a random signal within the audible frequency range whose amplitude decreases as frequency increases, maintaining constant audio power per frequency increment.
Origin
1960-1965
1960-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pink-noise

pink noise

noun
1.
noise containing a mixture of frequencies, but excluding higher frequencies
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for pink-noise
noun

random white noise that has been adjusted so there is equal energy per octave

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