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(Direct Stream Digital) The sampling technique used in Sony's high-resolution SACD music format. Although SACD discs never took off and new ones are few and far between, the DSD format is used to encode music for high-quality downloads. Increasingly, Blu-ray players and music servers can decode the format. Digital DSD files use DFF and DSF extensions, the latter holding meta-data.

From 44 Thousand to Millions of Samples
For standard CDs, music is digitized 44.1 thousand times per second, producing 16-bit PCM samples. In contrast, DSD uses pulse density modulation (PDM) to encode 2,822,400 1-bit samples per second (64 times the CD sampling rate). Each DSD sample is a 1 or 0 (either up or down from the previous sample). Compared to CDs, DSD boosts frequency response from 20 kHz to 100 kHz and dynamic range from 96 to 120 db. See PCM, PDM and CD.

Even Higher Sampling Rates
No longer confined to a physical disc, DSD resolutions have gone beyond SACD (see table below). The DSD's one-bit sampling generates a very low signal-to-noise ratio, and "noise shaping" shifts the noise to a high frequency that is filtered out before the final output. The advantage to higher sampling is that the noise is spread out over a wider frequency band, and the filtering can be relaxed. High-end DSD players offer multiple filtering modes to accommodate high-res DSD files. See SACD, DSD DAC, DXD, DoP, signal-to-noise ratio and high-resolution audio.
           MultiplesDSD          of CD        Number ofFormat      Samples  ---1-Bit Samples---

 (DSD64)        64    2,822,400 (2.8 MHz)

 (DSD128)      128    5,644,800 (5.6 MHz)

 (DSD256)      256   11,289,600 (11.2 MHz)

 (DSD512)      512   22,579,920 (22.5 MHz)
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References in periodicals archive ?
According to the experimental results [24], the simplification errors generated by progressive multiresolution meshes were between the DSD and Direct QSlim.
A total of 262 patients undergoing surgical intervention for DSD in our hospital were recruited from 1998 to 2012.
This book will provide the heath care professional with a greater understanding of the diagnosis and challenges that are encountered by families with a child that has been diagnosed with DSD, and is an excellent resource for the child birth educator.
DSD reported a profit after tax (PAT) of Rs.5.2 million on net sales of Rs.390 million for 2009-10, as against a PAT of Rs.0.26 million on net sales of Rs.118 million for 2008-09.
DSD Families has just published the largest consultation ever held with young people with a DSD and their parents.
*47 XXY Klinefelter and variants###*LH receptor defect###*Partial gonadal dysgenisis###*Partial###*Testicular DSD
The panel "expressed its concern as to an athlete's potential inability to remain in compliance with the DSD regulations in periods of full compliance with treatment protocols, and, more specifically, the resulting consequences of unintentional non-compliance".
A statement from the IAAF said that no athlete "will be forced to undergo any assessment" and that any treatment was up to the individual athlete.Athletes with differences of sexual development (DSD) have higher levels of natural testosterone, which the IAAF believes gives them a competitive advantage - findings that were disputed by Semenya and her legal team.
Individuals with congenital conditions in which development of chromosomal, gonadal or anatomical sex is atypical are classified as having "Disorder of Sex Development (DSD)".
Disorders of sex development (DSD) are "congenital conditions in which development of chromosomal, gonadal, or anatomic sex is atypical" (1).
Ovotesticular disorder is an extremely rare cause of disorder of sexual development (DSD), once known as true hermaphroditism.