[LAU] New 'acoustic metamaterial' cancels sound

[audio at fn.de]

On Thu, 7 Mar 2019 15:57:56 -0600, Chris Caudle wrote:
>On Thu, March 7, 2019 2:23 pm, Gerhard Zintel wrote:
>> For sure you can tune such a system to be efficient in
>> a small frequency range.  
>
>The article mentioned "a" high pitched tone, singular article in
>English implying single frequency or small spread of frequency.  Does
>not seem likely to be useful for music use,  might help for machinery
>with a specific annoying high pitch frequency.

Not for music, a "valuable" use case is provided by this article.

On Thu, 7 Mar 2019 21:23:31 +0100, Gerhard Zintel wrote:
>April 1st seems to be very early this year?!

This was my first thought, too.

Today is International Women's Day. I hope quoting a women isn't sexist.

"Drones are a very hot topic," Zhang says. Companies like Amazon are
interested in using drones to deliver goods, she says, and "people are
complaining about the potential noise."