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Pulse-code modulation

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Definition Edit

Pulse-code modulation is

method used to digitally represent sampled analog signals. At a regularly defined interval (in preservation it is most often 96,000 times per second), the amplitude of the analog signal is measured and stored (in preservation it is most often at 24 bit resolution).[1]

Overview Edit

It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps.

PCM streams have two basic properties that determine their fidelity to the original analog signal: the sampling rate, the number of times per second that samples are taken; and the bit depth, which determines the number of possible digital values that each sample can take.

References Edit

  1. ARSC Guide to Audio Preservation, Glossary, App. B, at 228.

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