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Delta Sigma audio encoding (DSD) - Glossary - Federal ...
http://digitizationguidelines.gov/term.php?term=deltasigmaaudioencodingdsd
Meanwhile, delta-sigma elements are a normal part of the pulse code modulation (PCM) encoding process. One-bit delta sigma modulation for sound is almost exclusively disseminated to endusers on the tangible media format called Super Audio CDs (SACDs), developed by SONY in association with Philips, where the prevalent term is Direct Stream Digital.
How work sigma delta modulation in audio
https://samplerateconverter.com/educational/how-work-sigma-delta-modulation-audio
Sigma delta modulation for high resolution audio it's 1-bit (digital) stream of 0 and 1. Thus coded audio signal. The format used for storing DSF, DFF and ISO [1-bit HD audio]. Unlike multibit (16, 24, ... bit) modulation with "low" sampling frequencies (44, 48, ... kHz), sigma delta modulation has super high sample rates
Delta Sigma vs. PCM - Gearspace.com
https://gearspace.com/board/high-end/113274-delta-sigma-vs-pcm.html
PCM is used in audio CDs and most of the rest of the audio industry DSD- (delta sigma digital) uses one bit to represent the loudness of the material. If the music sample is louder than the previous sample the value is 1 if it isn't it's a 0. But to get the quality the same you have to oversample what you would in PCM.
DSD vs. PCM: Myth vs. Truth - Mojo Audio
https://www.mojo-audio.com/blog/dsd-vs-pcm-myth-vs-truth/
In order for you to play PCM files on a Delta-Sigma DAC or DSD files on an R-2R DAC the files have to be converted in real time. Most modern Delta-Sigma DAC chips can decode multiple file formats, including PCM, DSD, and Wide-DSD. When they are decoding PCM, a Delta-Sigma DAC chip has to first convert it into DSD, the chip's native format.
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