Why do we use 44,1 kHz frequency on CDs while we’re only being able to hear up to 20 kHz?
In: 38
CD’s sample at that frequency, 44,100 times per second.
If they sampled at 20,000, then it would sample once every sound wave, and every sample it got would see the same part of the sound wave. This system wouldn’t detect any sound at all in 20khz, because it sees the same part of the wave every time (and that wouldn’t look like a wave).
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