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MEMS Design Shrinks Speakers to Chip Scale

11/22/2017 00:01 AM EST
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R_Colin_Johnson
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Re: Long Time Coming
R_Colin_Johnson   11/22/2017 11:03:55 AM
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Thanks for those insightful comments, Les. Its always a pleasure to benefit from your deep understanding of electronics in general and acoustics in particular here. Still not sure what the main limiting factor on bass with MEMS speakers, but it also is quite apparent in hearing aids.

Les_Slater
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Re: Long Time Coming
Les_Slater   11/22/2017 10:14:25 AM
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R_Colin,

Nice to hear of progress in this area.

Bass is not only a function of driver area but also excursion, and listening chamber size too. Reasonable bass response with earbuds is not primarily signal processing but the fact that the earbud, at least partially, seals the ear canal, limiting chamber size.

After all, the tympanic membrane (ear drum) is only 8 x 10 mm, so the issue really boils down to coupling.

Les Slater

Chicago

R_Colin_Johnson
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Long Time Coming
R_Colin_Johnson   11/22/2017 9:19:19 AM
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Since the invention of MEMS audio microphones there has been a worldwide concerted effort to create MEMS speakers--after all current earbuds, smartphones and wearables have scant room for conventional speakers. Now this Austria company has finally broken the ice on a design that has already been built into designer sunglasses. It still lacks bass--but is being designed into multispeaker setups with a convenional bass driver--and still has that "digital" sound quality, like a CD versus vinyl, but its only in its first generation and I'm sure engineering will solve these problems over the next decade, especially as new players jump oin the bandwagon.

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