Digital eXtreme Definition
Digital eXtreme Definition (DXD) is an alternative audio encoding scheme for professional use that was developed for editing high-resolution recordings recorded in DSD, the audio standard used on Super Audio CD (SACD). Because the 1-bit DSD format used on SACD is not suited for editing, alternative formats such as DXD are often used during the mastering stage. Contrasted with DSD-Wide or DSD Pure which offers level, EQ, and crossfade edits at the DSD sample rate (64fs, 2.822 MHz), DXD is a PCM signal with 24-bit resolution (8 bits more than the 16 bits used for Red Book CD) sampled at 352.8 kHz – eight times 44.1 kHz, the sampling frequency of Red Book CD. The data rate is 8.4672 Mbit/s per channel – three times that of DSD64. DXD utilizes the vast array of plugins also available to PCM based digital audio workstations, such as Cubase, Logic, Digital Performer, etc.
DXD was initially developed for Merging’s Pyramix DSD workstation.
- Description of DSD Pure/DSD-Wide http://www.superaudiocenter.com/images/Sonoma32.pdf
- DSD-Wide. A Practical Implementation for Professional Audio. (Audio Engineering Society E-Library) http://www.aes.org/e-lib/browse.cfm?elib=9998
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