(Source: MIT - Massachusetts Institute of Technology) MICROPHONES exist in many shapes and sizes, and work in many different ways. In the late 19th century, early telephones relied on carbon microphones, pioneered by Thomas Edison; today's smartphones contain tiny microphones based on micro-electro-mechanical systems, commonly called MEMS. Specialist microphones abound in recording studios; others are used by spies. But whatever the technology, these microphones all do the same thing: they convert sound waves into an electrical signal. It turns out, however, that with the addition of suitable software, microphones can detect more than mere audio signals. They can act as versatile sensors,...
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