In this picture you can see the waveform of the audio track on film, but how in the world can you create sound from just a amplitude?:
Picture: [https://images.squarespace-cdn.com/content/v1/57e9a1c0f7e0ab213fe99f4a/1493060981670-OAI5ANMFURAHOO6XF2OQ/Screen+Shot+2016-12-01+at+5.20.55+PM.png](https://images.squarespace-cdn.com/content/v1/57e9a1c0f7e0ab213fe99f4a/1493060981670-OAI5ANMFURAHOO6XF2OQ/Screen+Shot+2016-12-01+at+5.20.55+PM.png)
i understand how sound can be reproduced like on speakers and such, Does a image of a wave form ACTUALLY contain audio data?
In: 6
If you look at a speaker making sound ….all it’s doing is moving back and forth. That’s exactly what the waveform on the film is doing. So yes all you need is amplitude that varies over time to store sound information.
In terms of how it actually works…there is a photosensitive “eye” that can tell how wide the waves are on the film. It converts that width into a voltage signal that changes as the width of the waveform changes.
That voltage gets sent to an amplifier that creates a new, much more intense version of that voltage, strong enough to cause the cones in the speakers to move.
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