pink noise
  • Noise whose sound energy is equal or constant per octave band. For example, the sound intensity would be constant throughout the 1000 Hz octave band, which comprises frequencies ranging from about 707 Hz to 1414 Hz, as it would be for the 250 Hz or 4000 Hz octave band, or any other octave band specified. The intensity of such noise is inversely proportional to frequency over the stated range. white noise passed through a filter with a 3 dB/octave rol-loff results in pink noise.

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