Downconversion to 16-bit/44.1 kHz digital audio is just one option for the DSD bit stream. The system’s 2.8224 MHz sampling rate is specifically designed for high precision downconversion to all current PCM sampling rates. In all cases, the conversions in sync are performed with simple integer multiplies and divides.
As a result, music companies can use DSD for both archiving and mastering. And DSD masters can be easily downconverted for release at any sampling rate or wordlength. This makes DSD a digital “Rosetta Stone,” able to speak all languages with equal facility. It also means that DSD can support a “hierarchy of quality” for distribution that allows the music company to precisely position different products for different applications.
A single DSD server can perform multiple tasks to support a music company’s production and marketing environments.
The sampling rate of Direct Stream Digital lends itself to simple down conversion to all the standard PCM distribution formats.
| Super Audio CD | CD | |
| Diameter (mm) | 120 | 120 |
| Thickness (µm) | 1.2 | 1.2 |
| Track Pitch (µm) | 0.74 | 1.6 |
| Data Capacity (Mbytes) | 4700 | 780 |
| Wavelength (nm) | 650 | 780 |
| Numerical Aperture (NA) | 0.6 | 0.45 |
| Audio Coding | Direct Stream Digital | Linear PCM |
| Sampling Rate (kHz) | 2822.4 | 44.1 |
| Sampling Bit Length | 1 | 16 |
| Channels | 2, 3, 3.1, 4, 4.1, 5, 5.1 | 2 |
| Tracks | 255 (max) | 99 (max) |
| Indexes | 255 (max) | 99 (max) |
| Playback time (min.) Stereo | 109 | 74 |
| Multi + Stereo | 70 – 80*1 | – |
| Supplementary Data (kbps) | 73 – 900 | 43.2 |
| Frequency Range (Hz) | DC – 100,000 (DSD) | 5 – 20,000 |
| Dynamic Range (dB) | over 120 (~20kHz) | 96 |
* 1 : 12cm Single Layer Disc, 2ch and Multi channel with DST
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