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  • Have you ever noticed how, on a rainy night,

  • all other sounds seem to disappear?

  • The sound of the rain drowns them out.

  • And even though the sound of the rain goes on all night,

  • it doesn't keep you awake.

  • Rain is a kind of white noise

  • a steady, unchanging, unobtrusive sound.

  • White noise is made up of sounds from all the frequencies a human ear can hear,

  • with the sound at each frequency having equal power.

  • It’s calledwhitebecause the definition is like that of white light,

  • which is a combination of all the light wavelengths we can see.

  • You might think that a combination of all possible sound frequencies would be terrible,

  • but it’s notquite the opposite.

  • The reason for this is that white noise masks other sounds.

  • Think of it like the rain:

  • the sound of one drop falling, like from a leaky tap,

  • would be very distinct and annoying.

  • Two drops would be the same.

  • You could even tell three steady drips apart.

  • But if there were five or 10 or 1,000,

  • you couldn't pick out each individual drip.

  • They'd all blend into a sort of hum or a quiet roar and probably lull you to sleep.

  • The calming properties of white noise are starting to be used to treat different problems.

  • White noise can help restless people sleep and help migraine sufferers sleep through their pain.

  • It can be very useful for people with attention deficit disorders, who have trouble tuning out background noise.

  • White noise can help them concentrate.

  • It's even used to mask the sound of individual conversations by therapists and others who want to maintain privacy.

  • Who would have thought that mashing lots of sounds together would actually turn out to promote peace and quiet?

Have you ever noticed how, on a rainy night,

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    劉老 發佈於 2021 年 01 月 14 日
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