Why do we use 44,1 kHz frequency on CDs while we’re only being able to hear up to 20 kHz?
In: 38
There is a thing, called “Nyquist frequency”.
Basically, with 44.1kHz sample-rate, you can sample/store sounds up to 22.5kHz, accurately.
Imagine a sine-wave .. you need multiple points (samples) on that sine-wave, to be able to store and reproduce it, accurately.
The closer the tone gets to the sample-rate, the worse the audio-quality becomes.
So, 44.1kHz is basically just good enough to get the frequency-spectrum of the human hearing covered.
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