White noise

White noise Stationary noise spectral components of which are evenly distributed over the entire range of frequencies involved is called white noise. White noise got its name from white light which contains all frequencies of electromagnetic waves in the visible range of electromagnetic radiation. In nature and technology "pure" white noise does not occur. But any noise spectral density of which is the same or only slightly different in the considered frequency range falls under the category of white noise. The term "white noise" is usually applied to signals with an autocorrelation function, mathematically described by the Dirac delta function in all dimensions of multidimensional space, in which the signal is considered. Signals with this property can be considered as white noise. White noise finds many applications in physics and engineering. One of them is architectural acoustics. A constant white noise of low amplitude is generated to hide the unwanted noise in the interior spaces of buildings. In electronic music, white noise is used both as a tool for musical arrangements, and as an input for special filters that form other types of noise signals. White noise is used to measure the frequency characteristics of various linear dynamic systems, such as amplifiers, electronic filters, digital control systems. White noise is also used to generate random numbers and random sequences in many random number generators.

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Science & Technology