SACD - Super Audio Compact Disc


Super Audio CD (SACD) is an optical disc format for audio storage introduced in 1999. It was developed jointly by Sony and Philips Electronics and intended to be the successor to the Compact Disc (CD) format.
The SACD format allows multiple audio channels (i.e. surround sound or multichannel sound). It also provides a higher bit rate and longer playing time than a conventional CD.
An SACD is designed to be played on an SACD player. A hybrid SACD contains a Compact Disc Digital Audio (CDDA) layer and can also be played on a standard CD player.

SACDlogo.svg
Media type Optical disc
Encoding Digital (DSD)
Capacity 4.38 GiB / 4.7 GB (Single Layer and Hybrid)
7.92 GiB / 8.5GB (Dual Layer)
Read mechanism 650 nm laser (780 nm for the CD layer of a Hybrid disc)
StandardScarlet Book
Developed bySony & Philips
UsageAudio storage
Extended fromCompact Disc Digital Audio
Released1999; 24 years ago
SA-CD characteristics
CharacteristicCD layer (optional)SACD layer
Disc capacity700 MB4.7 GB
Audio encoding16-bit pulse-code modulation1-bit Direct Stream Digital
Sampling frequency44.1 kHz2,822.4 kHz (2.8224 MHz)
Audio channels2 (stereo)Up to 6 (discrete surround)
Playback time if stereo80 minutes110 minutes without DST compression

DSD logo
Media type
  • Audio recording process
  • Disc format
EncodingDigital
Read mechanismDSD
Write mechanismSuper Audio CD
StandardISO/IEC 14496-3
UsageAudio recording
Extended topresent
Released1999

Single-rate DSD (DSD64)

Referred to as DSD, single-rate DSD or DSD64 because the sample rate of 2.8224 MHz is 64 times that of CD (44.1 kHz). DSD64 is the format used for SACD media.

Double-rate DSD (DSD128)

Referred to as DSD128 because the sample rate of 5.6448 MHz is 128 times that of CD. Since its establishment, content creators have made DSD128 recordings available, such as the audiophile label Opus3.

Quad-rate DSD (DSD256)

Referred to as DSD256 because the sample rate of 11.2896 MHz is 256 times that of CD.

Octuple-rate DSD (DSD512)

Referred to as DSD512 because the sample rate of 22.5792 MHz is 512 times that of CD.

16x rate DSD (DSD1024)

Referred to as DSD1024 because the sample rate of 45.1584 MHz is 1024 times that of CD.












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