Definitions from Wiktionary (white noise)

▸ noun:  (physics) 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.
▸ noun:  (nontechnically) Any nondescript noise used for background or to mask or drown out other noise.
▸ noun:  (figuratively, by extension) Speech that goes ignored or uncomprehended.
▸ Also see white_noise


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