Analog-digital converter, also known as A/D converter, quantizes (discretize) the analog or continuously varying amount of a sound signal and convert it into a corresponding number of circuits. The analog audio signal is divided into several points according to time, and a series of digital codes are used to represent the characteristics of the point. The denser the point is, the higher the fidelity of the sound signal and the smaller the distortion. Completed by the four steps of sample, hold, quantize and encode.
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