4 ms·

The article implies that the test stand was running at a fixed frequency. This makes me suspect that this has to be designed to interfere with transmission of s

The article implies that the test stand was running at a fixed frequency. This makes me suspect that this has to be designed to interfere with transmission of sound at a specific frequency, and perhaps isn't capable of eliminating more complex sounds like voices or music.

IshKebab 8y ago
Almost certainly. Most wave metamaterials aren't broadband. I can't actually remember any that are.
lolc 8y ago
Yes. If you click through to the paper you can see the frequency response dipping around 460 Hz. Which is the frequency they're using in the demo.