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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.
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Origin of pink noise

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for pink noise

pink noise

noun
  1. noise containing a mixture of frequencies, but excluding higher frequencies
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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