What Is Harry Nyquist Sampling Theory?

- Jun 14, 2018-

If an analog signal is sampled, the highest signal frequency that can be recovered after sampling is only half the sampling frequency, or if the sampling frequency is higher than twice the highest frequency of the input signal, the original signal can be reconstructed from the sampled signal series.

According to this sampling theory, the sampling frequency of a CD laser disc is 44KHz, and the highest recordable audio frequency is 22KHz. This kind of sound quality is almost the same as the original sound, which is what we often call Super High Fidelity (HiFi).



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