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DoP Direct Stream Digital (DSD) DSD over PCM A system of digitally recreating audible signals for the Super Audio CD (SACD). It uses pulse-density modulation encoding to store audio signals on digital storage media used for SACD's. An alternative to burning DSD files onto disks for eventual playback is to transfer the (non-encrypted) files from a computer to audio hardware over a digital link such as USB. "DSD over PCM", or "DoP", is suitable for other digital links that use PCM.