Fun random fact: the sample rate of Audio CD format is 44100Hz. The Nyquist frequency for audible sound is roughly double the upper limit of human hearing, which is 20kHz.
So why is the CDDA sample rate more than 40kHz, but only a little bit more?
The prime factorization of 44100 is 2^2โข3^2โข5^2โข7^2, which gives a LOT of options for computationally cheap downsampling and playback speed reduction. ๐
