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
The word “image” just means something like “impression.” Like if I press a steel die into wax it creates an image of the die in the wax.
Same goes if I ‘press’ photons onto photo-film or a CCD in a digital camera. The ‘image’ file is just an impression of the energy that created it.
Same thing goes for audio, the data is just a series of pressure-frequency readings over time. You can take the time dimension and project it in space on the horizontal axis, and do the same vertically with the pressure dimension, and in this way you display the ‘image’ of the sound as a picture. You can also take the ‘image’ of the sound and play it back as audio through your speakers.
The picture you see on screen was created in this way, and although the file behind is isn’t considered a traditional ‘audio file,’ it still contains the data that the waveform displays. You could in theory recreate it by analyzing the graph and playing it from your speakers. Its just a much more roundabout way to store the data as a picture to be analyzed than it is to use a specialized audio storage format.
Converting to a visual file format could also cause data loss, however if there are parts of the waveform too small to be represented at the given resolution. This can be worked around by making the file’s resolution larger.
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