The computer samples for changes in frequency along the x-axis of the wave, at given intervals. This is known as a sample rate. Its frequency is measured in hertz (Hz).
If a sound had a frequency of 1 Hz, it would take a minimum of two samples per cycle, or a 2 Hz sample rate to interpret. The human voice can range from 50 Hz up to about 4 KHz (KHz Kilohertz 1000 Hz).
This would require the ability to sample at a minimum of 8 KHz to capture the sound of a human voice. Musical instruments can reach frequencies up to 20 KHz. That is why standard sampling rate for CD-Audio is 44.1 KHz, just enough to sample music.
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