Hearing is be-leafing: Students invent quieter leaf blower

TheReturnOfPEB@reddthat.com to Technology@lemmy.world – 598 points –
Hearing is be-leafing: Students invent quieter leaf blower
hub.jhu.edu
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wtf is shifting?

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.