Afaik, in digital sound recordings it's basically an array of sampled amplitudes. And you need to know the sampling rate in advance, eg 44100 samples in a secon

Afaik, in digital sound recordings it's basically an array of sampled amplitudes. And you need to know the sampling rate in advance, eg 44100 samples in a second. This is I think called PCM https://en.wikipedia.org/wiki/Pulse-code_modulation https://en.wikipedia.org/wiki/Pulse-code_modulation