White Noise

White noise is a random signal or process with a flat power spectral density. In other words, the signal contains equal power within a fixed bandwidth at any center frequency. White noise draws its name from white light in which the power spectral density of the light is distributed over the visible band in such a way that the eye's three color receptors (cones) are approximately equally stimulated.

In statistical sense, a time series rt is characterized as having weak white noise if {rt} is a sequence of serially uncorrelated random variables with zero mean and finite variance. Strong white noise also has the quality of being independent and identically distributed, which implies no autocorrelation. In particular, if rt is normally distributed with mean zero and standard deviation σ, the series is called a Gaussian white noise.

An infinite-bandwidth white noise signal is a purely theoretical construction. The bandwidth of white noise is limited in practice by the mechanism of noise generation, by the transmission medium and by finite observation capabilities. A random signal is considered "white noise" if it is observed to have a flat spectrum over a medium's widest possible bandwidth.

Read more about White Noise:  White Noise in A Spatial Context, Statistical Properties, Applications, Random Vector Transformations, Random Signal Transformations, Generation

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... tile floors and hard wall surfaces, greatly increases noise levels and can prove detrimental to learning ... One study of hyperactive versus control groups of children found that white noise has no impact on either group, but that auditory stimulation such as distant conversations or music has a negative ... disorder scored higher on tests when white noise was being pumped into the classroom than when music was played ...

Famous quotes containing the words noise and/or white:

    I live in the angle of a leaden wall, into whose composition was poured a little alloy of bell-metal. Often, in the repose of my mid-day, there reaches my ears a confused tintinnabulum from without. It is the noise of my contemporaries.
    Henry David Thoreau (1817–1862)

    The whole white world is ours.
    Hilda Doolittle (1886–1961)