DSD

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DSD

(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 3 Million 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.

Beyond the Original
No longer confined to a physical disc, DSD resolutions have evolved beyond the original SACD format (see table below). See SACD, DSD DAC, DXD and high-resolution audio.
           MultiplesDSD          of CD        Number ofFormat      Samples  ---1-Bit Samples---

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

 Double-rate
 (DSD128)      128    5,644,800 (5.6 MHz)

 Quad-rate
 (DSD256)      256   11,289,600 (11.2 MHz)

 Octuple-rate
 (DSD512)      512   22,579,920 (22.5 MHz)
References in periodicals archive ?
Like the STR-DN1050 and STR-DN850 audio/video receivers, the BDV-N7200 supports a wide range of standard and Hi-Res file formats, from MP3 to Direct Stream Digital (DSD), via a home network, HDMI, or USB connection.
09 percent THD), six HDMI inputs (five rear, one front) with Direct Stream Digital and two HDMI outputs.
The integrated SA-CD high-resolution audio format is based upon Direct Stream Digital (TM) (DSD) technology.
For SACD applications, the CS4398 includes a patent-pending Direct Stream Digital processor that includes a volume control engine that does not decimate the data stream, thereby maintaining the native sampling rate of 2.
SACD is based upon the Direct Stream Digital (DSD) technology which directly records and reproduces 1-bit signals, introducing less distortion compared with traditional PCM technology.
The theory is that the regular two-channel layer is even better than what RCA previously provided in their "Living Stereo" series because the sound has been remastered via DSD, Direct Stream Digital.
Super Audio CD, which uses Direct Stream Digital (DSD) Encoding, has a frequency response five times greater than other audio CDs and multi-channel, pure and precise high-resolution sound.
Super Audio CD uses Direct Stream Digital (DSD) Encoding, has a frequency response five times greater than other audio CDs and multi-channel, pure and precise high-resolution sound.