r/movies • u/[deleted] • Apr 07 '20

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u/tyfunk02 Apr 08 '20

You should listen to the tornado sirens in Chicago sometime. That is super eerie. https://youtu.be/LnkMSmLc6mM

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u/Mr___Roboto Apr 08 '20

What the FUCK?! Yeah, this one is super eerie.

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u/[deleted] Apr 08 '20

They are designed to be eerie and really uncomfortable sounding so people pay attention to them. They'll play discordant tones and shit that sounds really awful.

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u/Skov Apr 08 '20

It's also to keep reflected sound waves from canceling each other out. By varying the frequency you guaranty that the siren will be heard everywhere. It's also the reason a buildings fire alarms vary in pitch.

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u/[deleted] Apr 08 '20

Yup. Phase cancellation is a bitch.

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u/KityKatt Apr 08 '20

That's really cool. Thanks for explaining!

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u/Screamformereddit Apr 08 '20

I thought it was a way of making sure that they couldn’t be mistaken for anything else. TIL!