The primary difference between DVD-Audio and SACD are the methods used for
digital audio encoding. DVD-Audio uses the more traditional Pulse Code
Modulation (PCM) while SACD uses the newly pioneered Direct Stream Digital
(DSD) method. The DSD method is explained in more detail below (courtsey of
http://interprod5.imgusa.com/son-403/technology.asp). Another difference is the
sampling rate. DVD-Audio is 24-bit, with a sampling rate of 96 kHz, while SACD
has a sampling rate of 2.8MHz. Both can provide extra information in the form
of text and graphics, but only SACD can provide video clips (there is a higher
form of DVD-Audio called DVD-AudioV that allows for video clips as well).
Additional information:
WhatIs Description of SACD
http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci510039,00.html
WhatIs Description of DVD-Audio
http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci510035,00.html
RIAA's description of SACD and DVD-Audio
http://www.riaa.org/Audio-Media-1.cfm
Technology behind SACD, DSD
http://interprod5.imgusa.com/son-403/technology.asp
"Direct Stream Digital® encoding: a foundation for the future.
A fundamental breakthrough in audio technology, Direct Stream Digital® encoding
represents the evolution of digital audio — unsurpassed in reproductive
authenticity. Providing an unrivaled level of sonic quality, DSD® encoding is
destined to serve as the foundation for digital audio in the future.
Simplifying the signal path
When attempting to capture and reproduce pure audio, less is more. While
traditional PCM processing degrades and compromises quality through the use of
multiple filters, Direct Stream Digital® processing eliminates excessive
filtration, simplifying the sound capture process and allowing a 1-bit signal
to be recorded directly.
Beyond comparison
Direct Stream Digital® processing is dramatically different — even when
compared to the most sophisticated PCM technology. A 1-bit system, DSD® encodes
music at an astonishing 2,822,400 samples per second, resulting in more than
just superb frequency response and dynamic range. Capable of exposing the inner
detail of choral ensembles, the reverberation trailing from a guitar chord, and
even the acoustic space surrounding an instrument, DSD® technology reproduces
every nuance of sound with incredible ease and clarity.
The digital equivalent of straight wire with gain.
The DSD® analog-to-digital converter produces a one-bit pulse train that
remarkably mimics an analog wave. In this manner, DSD® encoding combines the
advantages of digital recording with the well-regarded characteristics of
analog sound." |
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