Does sound have a ‘frames per second’ like video? If not, how is it slowed down and sped up?
In: Physics
* Yes.
* Digital audio does have something almost exactly the same as frames called “samples”.
* A sample is simply the value of the voltage on the wire at a given point in time.
* Using these samples, the audio system can re-create the voltage wave that can be fed into an audio amplifier just like the signal from a mic.
* So when digital audio is recorded and played back, it has to be done at the proper “sample rate” which is the same as a video’s “frame rate”.
* Said another way, it has to use the proper “samples per second”.
* It’s a little different with straight up analog audio because it’s based on the medium upon which it’s recorded.
* Mostly analog audio is recorded on magnetic tape.
* In order for it to sound correct, the tape needs to be played back at the same speed as it was recorded.
* So in that case it would be a unit of length passing by the playback head over a given amount of time.
* So something like “millimeters per second”.
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