It is really hard to imagine how I am able to rewatch a moment of the past just because some fancy camera recorded it? If I think about it it feels very unnatural.
What are the key parts of microphones and cameras that make them work the way they work?
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Nowadays cameras use a CCD or charged couple device, which is basically a fancy sensor that turns photons into electric signals. By using a lens that bends light, a clear image can be made out of the light that enters the lens, and when that light hits the CCD the electrical signals are stored as digital code that can be reproduced as an image on a screen or as a picture from a printer.
Sound is captured by a microphone which has a little diaphragm that moves back and forth when sound waves hit it. That movement can be turned into analog electrical signals or digital ones then turned back into sound by moving another diaphragm with magnets. That moving diaphragm pushes against the air creating sound waves you can hear.
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