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While pink noise looks "flat" when viewed on a 1/3 octave Real Time Analyzer, it actually has a response which decreases with increasing frequency. The analyzer however, averages an increasingly large bandwidth in each band, so the resulting combination looks flat. This is what the actual response of the pink noise looks like.
Magnitude response of the Pink Noise Generator. The slope is -10dB/Decade or -3dB/Octave.
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