9AUDIO SIGNALS
In this chapter, we continue exploring the relationship between continuous and discrete signals. The Nyquist–Shannon sampling theorem relates continuous signals and discrete signals. To properly discretize a continuous signal, we must sample it at a rate at least twice that of the highest frequency present in the signal. The theorem is why compact discs sample audio signals at 44.1 kHz, or 44,100 times per second. At that rate, any frequency up to 22,050 Hz will be captured. Note that 22 kHz is the theoretical upper limit on the highest frequency a human can hear, though most adults have a much lower upper limit; mine is about 13.5 ...
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