How do audio signals recorded onto motion picture film as waveforms get converted into audio that can be heard, like in a movie, especially with different channels like stereo, and surround sound.
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On analog films, if you look closely at one, you’ll see a small stripe down one or both edges with areas of varying darkness and transparency. This is a sound wave recorded on film. When a light shines through it, the variations in light intensity are picked up by a photoreceptor on the other side, and converted into an electrical signal, which is amplified and played through speakers.
This was a common technique used in those 16 mm educational films shown in school classes in the 1960s through the 1980s.
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