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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, 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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Networking between Industries: A number of DSD business units are now working with companies to develop networks which will help Tasmanian businesses to grow both in scale and scope;
Canberra has so far been unwilling to share intelligence material collected from DSD transcripts because of concerns that Indonesia would adopt countermeasures for blocking future intercepts, according to the report.
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Pictured outside AFC Craigavon's state-of-the-art changing rooms pavilion at the official opening are Craigavon Mayor Colin McCusker MLA, DSD Minister Nelson McCausland MLA, AFC Craigavon Chairman Jim Burke, and architect Maurice Johnston of Bryson Architects and IFA Board Member.
Approximately 20 per cent of all respondents have experienced, or expect to experience, at least $1 million a year in tangible cost-savings through DSD process re-engineering, and about 20 per cent of companies with 3,000 or more employees anticipate saving at least $3 million, he revealed.
According to Dr Aloum, DSD is safe, pain-free and completely reversible with no change to permanent teeth.
DSD alleged that she suffered a depressive disorder as a result of her treatment by officers during the 2003 investigation, while NBV claimed that she suffered serious distress, anxiety, guilt and an exacerbation of post-traumatic disorder and depression as a result of her treatment during 2007.
DSD has now revealed that in CSOC's first year of operation, it dealt with 188 incidents of serious snooping or theft in Australian government networks, the Age reports.