pink noise
PrintA random noise signal that has been filtered so its spectral density is shaped to drop by 3 dB per octave, thus giving it a constant spectral density per octave or third-octave band.
Pink noise is used for acoustic applications, such as loudspeaker test, since pink noise has a flat spectrum when viewed on a third-octave spectrum analyzer, or any constant percentage bandwidth analyzer (an analyzer whose bandwidth is a constant percentage of the center frequency of the filter).
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