White Noise is created by a continuum of frequencies equally distributed over the whole hearing range. In healthcare applications, white noise is used to treat hyperacusis, an increased sensitivity to normal environmental sounds, or to camouflage the annoyance caused by tinnitus, a ringing in the ear occurring without any stimulus. White noise is also used to mask background noises in the office, or to aid in sleep.
Although all frequencies are produced in equal intensity, white noise sounds much brighter than what we would expect from a spectrally flat noise. This is due to the nature of our hearing, which doesn't sense all frequencies equally. Therefore, people often prefer to listen to Pink Noise, a noise that boosts the lower frequency range to compensate for the unnatural brightness of white noise, or Brown Noise, a noise that puts even more emphasis on the lower frequencies. When one exactly compensates for the particular sensitive curve of the human hearing, white noise turns Grey.
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