White-noise definitions

Acoustical or electrical noise of which the intensity is the same at all frequencies within a given band over time.
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A sound containing a blend of all the audible frequencies distributed equally over the range of the frequency band.
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Constant background sound or sounds, as from an appliance, traffic, etc.
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Recorded sound or sounds intended to serve as background noise, as in an effort to create a relaxing atmosphere or to mask other noises.
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A random signal of every frequency in the audio spectrum, all of which have an average uniform power level. White noise is generated for a variety of purposes, including masking sounds in a room, testing loudspeakers for distortion and coloration and to provide input to a synthesizer, which uses filters to derive all of its sounds. Contrast with pink noise and Gaussian noise.
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The background noise that is continuously present on electrical circuits or radio circuits due to the thermal agitation of electrons.White noise has a flat power spectral density, which is to say that it has equal power at any frequency in any given frequency band. The term white noise comes from the fact that it is analogous to white light, which is a combination of all frequencies or wavelengths in the visible light spectrum. At acceptable levels of signal-to-noise ratio (SNR), white noise takes the form of a background hiss or mild level of static noise.White noise is even desirable and often added to digital circuits, which can be so quiet during periods of voice inactivity as to fool a listener into thinking that the connection has been dropped. People find the addition of this comfort noise to be reassuring at mild levels.At unacceptable levels of SNR, white noise can overwhelm an audio signal or cause bit errors in a data transmission. White noise is often referred to as Gaussian noise, although the two are not necessarily the same, as Gaussian noise refers to the distribution of the signal values. See also Gaussian noise, noise, and SNR.
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(physics) A random signal (process) with a flat power spectral density; a signal with a power spectral density that has equal power in any band, at any centre frequency, having a given bandwidth.
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(nontechnically) Any nondescript noise used for background or to mask or drown out other noise.
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Origin of white-noise

From the analogy with white light