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Pulse-Density Modulation

From Hydrogenaudio Knowledgebase

Pulse-Density Modulation (PDM) is a modulation technique in which the density of pulses is varied in accordance with some characteristic of the modulating signal.

Sony calls it DSD and uses it for SACD.

See also

Pulse Code Modulation (PCM)
Pulse-Amplitude Modulation (PAM)

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Technical