I researched the two types of noises to find out which one is better to play on your sound machine while sleeping.

PROC SPECTRA prints two test statistics for white noise when the WHITETEST option is specified: Fisher's Kappa (Davis 1941, Fuller 1976) and Bartlett's Kolmogorov-Smirnov statistic (Bartlett 1966, ...

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When Apple introduced the feature, there were six ambient sounds you could play on a loop: rain, stream, ocean, and bright, balanced and dark noise, which are different pitches of white noise.

New built-in audio is coming to your iPhone. Credit: Mashable / Canva Your iPhone has the ability to play "white noise" audio with built-in sounds that can be accessed via the Accessibility settings.