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LP, CD, SACD and DVD-A again
LP, CD, SACD and DVD-A again
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Old 19th August 2004, 04:39 AM   #1
Gordon McGregor is offline Gordon McGregor  United States
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Join Date: Apr 2004
Location: CA
Default LP, CD, SACD and DVD-A again

http://www.digit-life.com/articles2/...d-a/index.html
Some interesting information about formats. In addition, some researches about audibility of hypersonic images are here http://jn.physiology.org/cgi/content/abstract/83/6/3548
The full article in pdf file is there as well.
Plus some pictures:
Here is the analog noise floor comparison for dithered and noise-shapped modern CD vs SACD: http://members.cox.net/alex_lat/Test...SACD_noise.PNG
Here is the switching of SACD modes (one is -100dB S/N , till 100kHz FR and another one is 20Hz-20kHz mode, -120dB S/N)
http://members.cox.net/alex_lat/Tests/SACD_modes.PNG
Switching is performed in DSD decoder CXD2753, used in almost all SACD players. In some players, such as Denon A11 or top Sony ones, it can be done manually. http://members.cox.net/alex_lat/Tests/RFSACD.PNG
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Old 19th August 2004, 02:36 PM   #2
Cameron is offline Cameron  United States
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Join Date: May 2003
Location: Saint Louis
Great articles! Especially the first one. Answered some of my more technical questions. I think it is interesting though not suprising to see that SACD is outselling DVD-A by a factor of 3.25. That camp has so many more titles available. The main thing I don't understand is: If they really want either format to catch on, why don't they offer us some decent music choices?

Here is a comparison breakdown as I see it:

DVD-A
---------------------------
- where is the freaking music?
+ better overall performance
+ consistent resolution across audio band
- authoring is very complicated
+ authoring software is available though expensive
+ easy to process with DSP or software
- never seen a 192/24 recording anywhere
- many transfers only 48/24, so why bother?
+ just recently playable in a very few computers
- video not necessary, but recommended for navigation
- designed by commitee, aka a cluster ******

SACD
----------------------------
+ better but still incredibly poor variety of music
+ better low frequency resolution
- poor high frequency resolution
- much higher digital noise near audio frequencies
+ supposedly easier to author
- no authoring software available
- very difficult to process via DSP or software
- not playable in computers
+ no video needed
+ singular design vision though way too proprietary

In my opinion, there are more than sufficient negatives for both formats to keep them from becoming widespread.
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