Pink Noise: Pink noise is a random noise source characterized by a flat amplitude response per octave band of frequency, i.e., it has equal energy, or constant power, per octave. Pink noise is created by passing white noise through a filter having a 3 db/octave roll-off rate. Due to this roll-off, pink noise sounds less bright and richer in low frequencies than white noise. Since pink noise has the same energy in each 1/3-octave band, it is the preferred sound source for many acoustical measurements in respect to the critical band concept of human hearing. The name comes from the filtering of white noise. White noise is analogous to white light in that it contains all audible frequencies distributed uniformly throughout the spectrum. Passing white light through a prism (a form of filter) breaks it down into a range of colors. Examination shows that red light is characterized by the longer wavelengths of light, i.e., light in the lower frequency region. Similarly, pink noise has higher energy in the low frequencies, hence the term, pink.

 

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