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Pulse Code Modulation

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Pulse Code Modulation (PCM) is a method of recording sound as digital data. The amplitude of the audio signal is sampled at a regular sampling rate, and quantized with a fixed bit depth.

This technology was created by Alec Reeves in 1937.

See also

Pulse-Density Modulation (PDM)
Pulse-Amplitude Modulation (PAM)

A page on PCM history (Archived as of April 6, 2003)

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