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Hearing is be-leafing: Students invent quieter leaf blower (hub.jhu.edu)

submitted 6 months ago by [email protected] to c/technology

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[–] curiousPJ 6 points 6 months ago* (last edited 6 months ago) (1 children)

I wonder if that shares the same physics as silvent's compressed air guns.

Silvent’s air nozzles reduce the sound level when blowing with compressed air compared to blowing through open pipes. This is due in part to the reduction in noisy turbulence from using Silvent’s air nozzles, and also because of the nozzles’ special design. Silvent’s air nozzles pass the compressed air through small holes and slots, which raises the sound to frequencies beyond what the human ear can perceive. This allows us to make blowing with compressed air both quiet and efficient.

Could use an even quieter compressed air gun

[–] A_A 6 points 6 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.