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Slave to Noise No More March 12, 2019

Posted by geoff in News.
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This is way too cool:

Scientists have discovered a shape that blocks all sound–even your co-workers

A team of Boston University researchers recently stuck a loudspeaker into one end of a PVC pipe. They cranked it up loud. What did they hear? Nothing.

…The pipe was actually left open save for a small, 3D-printed ring placed around the rim. That ring cut 94% of the sound blasting from the speaker, enough to make it inaudible to the human ear.

Here’s the ring, which is totally passive:

BU Noise Cancellation Ring

[Photo: Cydney Scott/Boston University]

It appears that you have to design it for specific frequencies, and the size is likely to be dependent on the frequencies (making it bulky when blocking low frequencies.

But it’s still way too cool.

Comments

1. Sobek - March 13, 2019

Can it be customized to fit a specific individual’s mouth?

2. Retired Geezer - March 13, 2019

I want one for my TV.


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