Does sound have a ‘frames per second’ like video? If not, how is it slowed down and sped up?
In: Physics
Sound recordings does have samples per second. It is possible to play back the sound at different samples per second in order to speed it up or slow it down. However unlike pictures our perception of sound is based around frequency which is based on time. While video framerates are usually in the tens of frames a second sound is usually sampled at 48 thousand samples per second. This is because the frequency information that you perceive is encoded in the samples. In order to capture a sound you need twice the sample rate of its frequency. So while it is easy to speed up or slow down video playback without altering the pictures you perceive if you do the same with the sound playback you will change the pitch of the sound. It is possible to change the playback speed of sound without changing the pitch but this requires fairly complex math to do.
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