Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Direct Stream Digital
open-in-new
<p>Direct Stream Digital (DSD) is a <a href="/facts/Trademark/B23H8IS0">trademark</a> used by <a href="/facts/Sony/7x4tCtBd">Sony</a> and <a href="/facts/Philips/Xp4uczGg">Philips</a> for their system for digitally encoding audio signals for the <a href="/facts/Super_Audio_CD/f4a7Gu0V">Super Audio CD</a> (SACD). </p><p>DSD uses <a href="/facts/Delta-sigma_modulation/QrhBCoUe">delta-sigma modulation</a>, a form of <a href="/facts/Pulse-density_modulation/eQqzyEu7">pulse-density modulation</a> encoding, a technique to represent audio signals in digital format, a sequence of <a href="/facts/Audio_bit_depth/24ccTeTT">single-bit</a> values at a <a href="/facts/Sampling_rate/xxck7aLN">sampling rate</a> of 2.8224 <a href="/facts/Megahertz/6Wshj5qm">MHz</a>. This is 64 times the <a href="/facts/CD_audio/g51GRloc">CD audio</a> sampling rate of <a href="/facts/44.1_kHz/7SBI1DYS">44.1 kHz</a>, but with 1-bit samples instead of 16-bit samples. <a href="/facts/Noise_shaping/Afg4289r">Noise shaping</a> of the 64-times <a href="/facts/Oversampling/9rka4Dpg">oversampled</a> signal provides low <a href="/facts/Quantization_(signal_processing)/fddS3BE2">quantization</a> noise and low <a href="/facts/Distortion/z8RJcwNy">distortion</a> in the audible bandwidth necessary for <a href="/facts/High_resolution_audio/FYFhuVpR">high resolution audio</a>. </p><p>DSD is simply a format for storing a <a href="/facts/Delta-sigma_modulation/QrhBCoUe">delta-sigma</a> signal without applying a <a href="/facts/Decimation_(signal_processing)/gN5Wwrhv">decimation</a> process that converts the signal to a <a href="/facts/Pulse-code_modulation/5gdfjtH3">PCM</a> signal. </p>