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Pink noise is a specific kind of spectral noise with different intensity over different parts of the frequency spectrum. It has specialized uses in IT and other industries.
Pink noise has a linear or logarithmic nature, where power or intensity decreases by 3 dB per octave at a certain range of frequencies. Another way to characterize it is that it has distributed power in proportional bands. For example, pink noise would have the same intensity in a lower frequency range of 20 to 30 Hz as in a higher frequency range of 2000 to 3000 Hz. Pink noise can also be characterized by contrasting it to another type of noise called blue noise, which increases through parts of the frequency spectrum in a way similar to how pink noise decreases.
Because of its specific spectral distribution, which is complementary to what humans hear, pink noise is used for different scientific purposes. It can be used for:
Part of the unique nature of pink noise is its use across various scales, from scales approaching the nanoscale to the extremely large scales of astrophysics. Scientists also recognize its specific spectral noise properties and how they make pink noise desirable for different kinds of scientific research.