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This article goes into a little more detail: https://www.heise.de/en/news/MetaWindow-Laermschutz-an-Gleis...

And the PhotonicVibes site is here: https://phononic-vibes.com/metawindow-for-railway/

Here is a demo video for a meta material made by them: https://youtu.be/NElK8qKRrBU?si=CfBjUESlu_XUvnn_

That's a really cool demo!

Honestly, that demo alone would be enough to get funding at any demo day, really cool stuff.

Weirdly it says "up to 10dB" attenuation.. which isn't actually that much at all. 10dB would be a halving/doubling. I'm not sure how the apparent loudness / change in waveform amplitude display is so great, considering that actual hard stat...

3 dB would be halving/doubling. With 10 dB, you would get a ratio of 10x.

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