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
I wouldn’t exactly say that the image of a wave “contains” audio data. It might be more accurate to say that it “represents” audio data. But that’s just semantics.
When sound hits a microphone it creates a current/voltage signal. Accurately amplified and send to a speaker, the process is reversed. That signal is 2-dimensional: It has an amplitude that changes with time. We call that a waveform.
Anything that can accurately record that waveform can be used to re-create it. On old movie film, they used images like the one you posted. As it runs through the projector, it’s translated back to a voltage and can be amplified and sent to speakers for reproduction.
In modern digital systems, it’s converted into a series of numbers instead. One after another, very rapidly, they can also describe that waveform.
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