General > General Technical Chat
MEMS louspeaker
S57UUU:
I came across this:
Except maybe for earphones, I can't see how this might work. Or is there a way?
MarkT:
Hmm, I get a big whiff of something known to baffle brains. Converting ultrasound to sound isn't normally an efficient process, to say the least. And what about bass - you have to move lots of air - an affordable MEMS chip isn't big.
But without any useful details and numbers there's little to see here.
ebastler:
I just scanned that video using Youtube's time slider. Half an hour of rambling and not a single diagram or table with data? (And opinionated rambling too, by someone who wants to sell that technology.) Sorry -- I don't know how this technology is supposed to work, and this video is not how I am going to find out about it.
In general, I would be skeptical regarding membrane sizes and oscillation amplitudes. How are they planning to move air for lower frequencies and relevant amplitudes? Is it one of those highly directed, phased array approaches?
Kleinstein:
They may not have to move a membrane. I could imagine using a kind of micro pump.
SiliconWizard:
Agree with ebastler, we almost learn nothing.
MEMS microphones have been a thing for a good while now and work well for their intended purpose - which is mobile phones (for most of the market) and then relatively niche applications outside of that. They work well and are sturdy, but with some specific limitations (like max SPL).
For loudspeakers, I can't really see how this could make anything other than very low-power speakers, probably for earbuds and maybe future hearing aids (if we can even make MEMS speakers able to deliver enough acoustic pressure).
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