Pink noise or 1/f noise is a
signal or process with a
frequency spectrum such that the
power spectral density is proportional to the reciprocal of the frequency. The name arises from being intermediate between
white noise (1/f0) and red noise (1/f2, more commonly known as
Brownian noise).Within the scientific literature the term 1/f noise is used a little more loosely to refer to any noise with a
power spectral density of the form, where is frequency and 0 < α < 2, with α usually close to 1. These "1/f-like" noises occur widely in nature and are a source of considerable interest in many fields.
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