White noise
WordNet

noun


(1)   A `sh' noise produced by a stimulus containing all audible frequencies of vibration
WiktionaryText

Noun



  1. A random signal (or 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.
  2. Any nondescript noise used for background or to mask or drown out other noise.
 
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