Author Topic: Scientists have discovered a shape that blocks all sound–even your co-workers  (Read 1577 times)

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Offline Free Vulcan

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By Mark Wilson

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.

How was this possible? Did they block the other end of the pipe with noise canceling foams or a chunk of concrete? No, nothing of the sort. 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.

https://www.fastcompany.com/90316833/scientists-have-discovered-a-shape-that-blocks-all-sound-even-your-co-workers
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Offline Elderberry

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Quote
The researchers also believe that HVAC systems could be fitted with these silencers,

I wonder if they would still reflect back 94% of the sound once coated with dust.

Offline Cyber Liberty

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Kewl.  Next time I want to wear a PVC pipe in my ear I know what I'll do.
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Online Smokin Joe

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I can think of a couple of applications for something like this....
How God must weep at humans' folly! Stand fast! God knows what he is doing!
Seventeen Techniques for Truth Suppression

Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience.

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Offline Cyber Liberty

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I can think of a couple of applications for something like this....

I dunno...it looks like it's dependent on a standing wave, hence the PVC tube.
For unvaccinated, we are looking at a winter of severe illness and death — if you’re unvaccinated — for themselves, their families, and the hospitals they’ll soon overwhelm. Sloe Joe Biteme 12/16
I will NOT comply.
 
Castillo del Cyber Autonomous Zone ~~~~~>                          :dontfeed:

Online Smokin Joe

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I dunno...it looks like it's dependent on a standing wave, hence the PVC tube.
Yep, likely frequency tuned. I knew a guy who was working on something like this.
How God must weep at humans' folly! Stand fast! God knows what he is doing!
Seventeen Techniques for Truth Suppression

Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience.

C S Lewis

Offline dfwgator

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Offline thackney

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I can think of a couple of applications calibers for something like this....
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Online Smokin Joe

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GMTA... :shrug: :beer:

Might add a bit of stealth to a vehicle or two as well....
How God must weep at humans' folly! Stand fast! God knows what he is doing!
Seventeen Techniques for Truth Suppression

Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience.

C S Lewis

Offline IsailedawayfromFR

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I can think of a couple of applications for something like this....
On AOC's microphone lead?
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Online Smokin Joe

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On AOC's microphone lead?
Those donut shaped seat cushions....

(Voice is different, breath's the same....)
How God must weep at humans' folly! Stand fast! God knows what he is doing!
Seventeen Techniques for Truth Suppression

Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience.

C S Lewis

Offline verga

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I can think of a couple of applications calibers for something like this....
First thing I thought of @thackney
In a time of universal deceit - telling the truth is a revolutionary act.
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