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Students’ Leaf Blower Suppressor To Hit Retail (hackaday.com)

submitted 6 months ago by floofloof@lemmy.ca to c/technology@lemmy.world

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[–] A_A@lemmy.world 90 points 6 months ago* (last edited 6 months ago) (50 children)

was posted 3 days ago in /c/Technology, here :
https://lemmy.world/post/15468260
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."

... "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.

[–] NeoNachtwaechter@lemmy.world 30 points 6 months ago (14 children)

about 12 decibels, which all but removes them, making them 94% quieter.

This "conversion" from decibel to per cent is more than ridiculous.

[–] MentalEdge@sopuli.xyz 55 points 6 months ago (2 children)

Why? dB is logarithmic so it's difficult for people to picture how loud something is, if that's the only number given.

[–] wewbull@feddit.uk 19 points 6 months ago (1 children)

And so are our ears. That's why we use db. So 12db is not perceived by us to be 94% quieter.

[–] webghost0101@sopuli.xyz 13 points 6 months ago (1 children)

So its 94% less sound because this seems sound calculated -12db in % with conventional formulas?

How would we describe perceived sound exactly, not many people can imagine something when given a db value? Maybe we should?

[–] Natanael@slrpnk.net 2 points 6 months ago (1 children)

When loudness is described there's often lists with examples of things with their typical loudness specified in dB, so you can compare against things you may have heard.

See the image chart here

https://decibelpro.app/blog/decibel-chart-of-common-sound-sources/

[–] webghost0101@sopuli.xyz 3 points 6 months ago

I have done a lil research but what i needed was this site. Great resource, maybe even coolguides material.

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