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Re: SACD equilivalent sampling rates

196.2.56.5

Posted by Rodney Gold on January 20, 2001 at 22:56:21

In Reply to: Re: SACD equilivalent sampling rates posted by Mars on January 20, 2001 at 22:31:14:

Yes , resolution due to noise shaping is very much increased at lower freqs , to a max of about 20 bits or so , what happens is that the noise over the whole spectrum is the same , but it is shifted to freqs or areas that are not at all critical - as you rise up the freq scale , noise increases , at about 100k , the noise is only -70 to -60db down from the signal or so. Every 6 db = 1 bit resolution , so at 100k , the SACD achieves about a 10-12 bit resolution (sort of)
Sonics will change according to what filter one uses to noise shape and what your equipment does re HF.
One must realise that we are not talking absolute values here , but incrementations and one cant really apply my prior explanation in the strictest terms.
One must also realise that DSD and PCM are not separate processes , its really just different implementations of the same type of process, neither is "better" and neither is Evil- both have compromises associated with them
Simply put , SACD is a sort of "raw" output of a 1 bit AD system that is nosise shaped and stored , conventional CDs use this Raw output but store this in another way.
SACD/DSD (whatever) is like getting the raw meat , one can do with it what one wants , mince it , fry it etc.
The other way , there are less options , the meat is already minced (bad choice of words , like the word decimation , implys some ruinous type of processing which isnt really the case) and one cant get back to the original steak to process it differently.
Thats why the Sony system is a great archival medium , it allows the user more flexibility as to what to do to the signal and assumes the least intervention possible with that signal
The "simple" analog filter Sony uses to process its data is a bit of a misnomer , the filter isnt THAT simple at all.

Rodney Gold

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