Audio: pink noise (0:02)
pink noise plays pink noise. The pink noise figure shows its spectrogram. The axis in the spectrogram is logarithmic not linear and the spectrogram shows how the power of red noise decreases with frequency.
Pink noise is unpitched sound in which power is inversely proportional to frequency.
Pink noise is sometimes called 1/f sound. This is because power is inversely proportional to frequency (f). All the frequencies in the sound spectrum are present in pink noise, but each frequency has a different amplitude.
Pink noise sounds much less hissy than white noise. This is because the amplitude of high frequencies in pink noise is less than that of low frequencies.
In nature, physical objects absorb high frequencies more easily than low frequencies. The result is that pink noise more closely resembles natural sound than does white noise. The spectrum of many natural sounds closely resembles that of 1/f sound. Consequently, pink noise is commonly used to create sound effects which simulate nature such as wind and rain.