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Re: [Phys-L] new audio speakers



That looked familiar to me, so I went hunting.

At the 2019 AAPT Apparatus Competition, a similar device was shown. I have
a picture somewhere, but it's missing to me at the moment.

See page 20 of this PDF:

https://www.aapt.org/Contests/upload/AppCompSM19_images_booklet.pdf

LLAP

Roger Key
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------------------------------


On Fri, Nov 13, 2020 at 10:39 AM Roger Key <rogerk@csufresno.edu> wrote:

Speculation: Ultrasonic sounds arranged to produce beats that make the
desired sounds, and those beats only happen at the location of the
listener's ears, while everywhere else the sound is almost eliminated by
destructive interference? I find it difficult to imagine, but maybe
possible?

Very cool technology, however they do it.


Roger Key
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------------------------------


On Fri, Nov 13, 2020 at 10:17 AM Anthony Lapinski <alapinski@pds.org>
wrote:

Hope everyone is doing well, feeling well, and teaching well in this new
reality.

Speaking of new realities, I saw this yesterday on the news. Wireless
speakers and no earbuds needed! I was intrigued. How does this work? How
can this work? Subsonic waves decrease in frequency to the audible range
when conducting through bone/tissue? Interference phenomenon?


https://apnews.com/article/new-tech-device-sound-beaming-noveto-38327ae5fe116080a5eaf2374eb0f5c8

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