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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

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)
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:

- 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 ******

+ 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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