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Q: Audio Formats ( Answered 5 out of 5 stars,   0 Comments )
Question  
Subject: Audio Formats
Category: Arts and Entertainment > Music
Asked by: harry_potter-ga
List Price: $5.00
Posted: 10 Apr 2002 11:04 PDT
Expires: 17 Apr 2002 11:04 PDT
Question ID: 5
What is the difference between sacd and dvd audio formats?
Answer  
Subject: Re: Audio Formats
Answered By: researcher-ga on 10 Apr 2002 12:01 PDT
Rated:5 out of 5 stars
 
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 DigitalŽ encoding: a foundation for the future. 
A fundamental breakthrough in audio technology, Direct Stream DigitalŽ encoding 
represents the evolution of digital audio — unsurpassed in reproductive 
authenticity. Providing an unrivaled level of sonic quality, DSDŽ 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 DigitalŽ processing eliminates excessive 
filtration, simplifying the sound capture process and allowing a 1-bit signal 
to be recorded directly. 
 
Beyond comparison 
Direct Stream DigitalŽ processing is dramatically different — even when 
compared to the most sophisticated PCM technology. A 1-bit system, DSDŽ 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, DSDŽ technology reproduces 
every nuance of sound with incredible ease and clarity.  
 
The digital equivalent of straight wire with gain.  
The DSDŽ analog-to-digital converter produces a one-bit pulse train that 
remarkably mimics an analog wave. In this manner, DSDŽ encoding combines the 
advantages of digital recording with the well-regarded characteristics of 
analog sound."
harry_potter-ga rated this answer:5 out of 5 stars

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