On 01/20/2018 01:12 PM, Jörn Nettingsmeier wrote:
On 01/19/2018 08:04 PM, Gary Gallagher wrote:
Wave field synthesis wall paper? How small does an an audio pixel have to
be?
The question is more like "how big can you make it?". An audio "pixel"
of a square millimetre cannot produce meaningful audio frequencies if
suspended in mid-air without a baffle, you would have to get somewhat
close to the wavelength. So no million-channel audio interfaces either,
I guess the approach would be to use lots of those pixels in unison. How
you ensure good airtight coupling between them is one question, and the
other is how much excursion you can get.
Thiele-Small parameters for silicon cavities, anyone? :-D
It's quite a moonshot actually, and if you start thinking about the
complexities, that carbon nanosheet paper that came from China a few
years back doesn't sound soo far-fetched anymore, where people were
producing sound by heating surfaces with an extremely good heat
conductivity (so its thermal cycles can be at audio frequencies).
Problem there is 100% k2, as it's effectively a half-wave rectifier...
Hit send too fast - meant to add that Fraunhofer in Germany has been
doing research on MEMS drivers for in-ear systems for a while, and they
combine the output of a cascade of laterally compressed nanomechanical
cavities in series to drive the eardrum.
--
Jörn Nettingsmeier
De Rijpgracht 8, 1055VR Amsterdam, Nederland
Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio), Tonmeister VDT
http://stackingdwarves.net
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