pink noise

noun
a random signal within the audible frequency range whose amplitude decreases as frequency increases, maintaining constant audio power per frequency increment.

Origin:
1960–65

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World English Dictionary
pink noise
 
n
noise containing a mixture of frequencies, but excluding higher frequencies

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  pink noise
Part of Speech:  n
Definition:  random white noise that has been adjusted so there is equal energy per octave
Dictionary.com's 21st Century Lexicon
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Example sentences
Sometimes also called pink noise, this music has some correlation, but less than brown music and more than white noise.
After pulsing the battery with pink noise, the team runs algorithms to calculate an impedance profile.
Pink noise contains less energy in the higher audio frequencies than in the lower ones.
The court may also mute audio and generate pink noise in the jury box to obscure audio during sidebars.
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