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A microphone is a device that converts a physical vibration (such as sound) into an electrical signal, that can be stored and/or processed.

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It's a bit out of your budget, but I'd consider a USB powered cardiod mic like the Audio Technica AT2020. It runs about $100 (though, you can find it cheaper) if you intend to use it with a Pi. Going …
answered Mar 5 '14 by Tim Post