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Comment on Hearing is be-leafing: Students invent quieter leaf blower

A_A@lemmy.world ⁨4⁩ ⁨months⁩ ago

what they did :

“Our product takes in a full blow of air and separates it,” said team member Leen Alfaoury. “Some of that air comes out as it is, and part of it comes out shifted. The combination of these two sections of the air makes the blower less noisy.”

Adds Chacon: “It ultimately dampens the sound as it leaves, but it keeps all that force, which is the beauty of it.”

Their design cuts the most shrill and annoying frequencies by about 12 decibels, which all but removes them, making them 94% quieter.

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cactusupyourbutt@lemmy.world ⁨4⁩ ⁨months⁩ ago
wtf is shifting?

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- gravitas_deficiency@sh.itjust.works ⁨4⁩ ⁨months⁩ ago
  The wording is comically awkward and imprecise. But if I had to guess, they figured out a way to fiddle with how the air is routed through the secondary portion such that the emitted noise is phase-shifted to cancel out the frequencies they’re targeting.
  
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  - dditty@lemm.ee ⁨4⁩ ⁨months⁩ ago
    Seems baffling
    
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    Tyfud@lemmy.world ⁨4⁩ ⁨months⁩ ago
    Eeeeeeeeeeyyyyyy
    
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    gravitas_deficiency@sh.itjust.works ⁨4⁩ ⁨months⁩ ago
    But you can’t deny it has a certain flow to it
    
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curiousPJ@lemmy.world ⁨4⁩ ⁨months⁩ ago
I wonder if that shares the same physics as silvent’s compressed air guns.

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- A_A@lemmy.world ⁨4⁩ ⁨months⁩ ago
  No, not the same … in your paragraph you describe an increase of the frequency at a level human hearing do not perceive while the other made cancellation of a given frequency using phase shifting and recombination.
  
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