Microphone
Microphone sensor A
Microphone converts sound waves into analog voltage signals. As the sound waves reach the microphone, they move a small diaphragm back and forth within the device. Attached to this diaphragm is usually a piezoelectric material that generates a voltage as the diaphragm moves back and forth. This "electronic signature" of the diaphragm motion can be captured, amplified, and then replayed back through speakers to produce sound again.
Similarly, the captured electronic recording can also be analyzed by a robot for speech detection, or even detect beats to music.
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