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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 ?
Se trata de un dispositivo Hi Res (alta resolucion) con ecualizador fonografico integrado que es capaz de realizar la conversion de audio analogico a Direct Stream Digital (DSD) de 5.
The ADV8005 includes a full CEC (Consumer Electronics Control) master and audio return channel receiver and can receive up to six channels of I2S, S/PDIF, direct stream digital (DSD), and high-bit-rate (HBR) audio.
As a result, Lightning is also the first system able to stream Direct Stream Digital (DSD), double-rate DSD and Digital eXtreme Definition (DXD) wirelessly.
2a receiver and DSP processing blocks to deal with Direct Stream Digital (DSD) data from an SACD disk.
Dedicated input ports allow for direct stream digital (DSD), which enables switching between PGM and DSD data.
1) Direct Stream Digital (DSD), source coding technology for superior high quality sound
These core values prompted Telarc to commit to recording in Direct Stream Digital and begin releasing titles on Super Audio CD.
I also noticed that Telarc engineers are using entirely different recording equipment these days--microphones, consoles, preamps, monitors, interconnect cables--and that the company is using Direct Stream Digital for their encoding, all of which would help to account for the differences I heard.