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 What is White Noise? White noise is a type of sound that contains every frequency within the range of human hearing in equal measure. It is often used to mask other sounds and can be generated by devices known as White Noise and Sound Machines  . These machines are commonly used to help people sleep, concentrate, or calm down. White Noise and Infant Sleep White noise machines are frequently used to help infants sleep. The steady, soothing sound is thought to mimic the womb environment, helping newborns to... more