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+ | [* black] Looking at the S1950 MEMS die gives you an idea of how it functions. The microphone itself has a simple design, comprising of two parallel [link|http://en.wikipedia.org/wiki/Polycrystalline_silicon|polysilicon] plates -- basically, very thin plates made of multiple small silicon crystals. |
[* black] The upper plate is perforated with an array of small holes, and they're separated by a small air gap. A solid bottom capacitor plate senses and relays the vibrations that occur when someone speaks into the microphone. |