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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)
References in periodicals archive ?
On the other hand, the volume of residents' spending during DSF is about equivalent to the average monthly amount they spend across the year, testifying to the stability of the financial confidence in the country.
Music-lovers will be in for a treat this final weekend of DSF with two concerts taking place on Friday 26 January.
With DSF starting during the festive season and a week before the VAT implementation, we are expecting a healthy demand for consumer electronics.
During DSF, customers purchasing products worth AED500 and above at all Jumbo outlets will also get one raffle coupon to enter the lucky draw.
DSF uses these funds to provide grants for those in the Department of State families who are suffering from a hardship or crisis.
In addition, five DSF shoppers have the chance to win weekly cash prizes of Dh50,000 each.
But retailers reserve the best deals and discounts for DSF as it is the biggest of them all," says Kabir Malkani, head of marketing at Lamcy Plaza and Arabian Center.
The Euro DSF contract is designed to meet the needs of European financial market participants, including banks, hedge funds, asset managers and insurers.
More than 50 million visitors have spent a total of Dh117 billion during the DSF so far, a spokesperson of Dubai Events and Promotions Establishment (DEPE), organisers of DSF, recently told Gulf News.
Starting from January 05 and going on till February 05, DSF 2012 will be set on an unprecedented scale.
The DSF was intended to be, pretty much as the name suggests, a month long festival dedicated to the simple pursuit of shopping.
While the global theme of 'One World One Family One Festival' will be predominant in DSF 2008 as in previous editions.