Delta Sigma audio encoding (DSD)

What is Delta Sigma audio encoding (DSD)?

Delta Sigma audio encoding (DSD) meaning in Digital terms is Process for sampling an input signal. In the realm of digital content, this approach is generally seen as applied to sound, where it is often described as “oversampling.” The delta-sigma (some say “sigma delta”) converter digitizes the audio signal with a very low bit depth (generally 1-bit) but a very high sampling rate. The oversampling and subsequent digital processing reduce aliasing and other distortion or noise, potentially to a greater degree than LPCM encoding. 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.


reference: Federal Agencies Digital Guidelines Initiative – Glossary