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Pulse-code modulation

A method used to digitally represent sampled analog signals.
Pcm

Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals. 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.

Linear pulse-code modulation (LPCM) is a specific type of PCM where the quantization levels are linearly uniform. This is in contrast to PCM encodings where quantization levels vary as a function of amplitude (as with the A-law algorithm or the μ-law algorithm). Though PCM is a more general term, it is often used to describe data encoded as LPCM.

A PCM stream has two basic properties that determine the stream's fidelity to the original analog signal: the sampling rate, which is the number of times per second that samples are taken; and the bit depth, which determines the number of possible digital values that can be used to represent each sample.

Key Terms

analog signals
law algorithm
lpcm
method
pcm
pcm stream
pulse code modulation
quantization levels
sample
standard form digital audio

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Acronymn

PCM

Synonymns

Pulse-code modulation
(none found)

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Sources & Credits

Last modified on September 25 2019
Content adapted from Wikipedia
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