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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Are you asking about actual analog film or modern digital movies?
For modern digital movies you have tons of separate audio tracks, and if say 5.1 surround sound then you can select which audio tracks go to which speakers. Dolby Atmos surround is more advanced and instead of which speakers you tell it where in 3D space the sound should come from and then depending on which of the dozens/hundreds of possible Atmos speaker layouts the listener has their own processor decides how to play those 3D positions (you still have bed/anchored positions, like dialogue is almost always locked to the center channel).
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For waveforms on film, you can read more on Wikipedia, but a light is shine through it and a reader captures that light, [here’s a diagram](https://www.granularsynthesis.com/hthesis/svdl7dl9.jpg), and based on how the waveform is it’ll change the light that passes thru, so the reader/decoder will know what the audio should be. It’s kinda ingenious (like imagine just one day thinking this up).
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