Does sound have a ‘frames per second’ like video? If not, how is it slowed down and sped up?
In: Physics
To add to what others are saying, there is a technique called wavelet transforms that can allow sound to be sped up without changing pitch. It is kind of like listening to music, and writing down the notes that are played as sheet music. If you know that you play C-E-G-C, you can play them fast or slow, and still get the same pitches. In fact, that is literally how .MIDI files work. .mp3 files do something similar (with a lot more notes than could be written down on sheet music).
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