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Old 23rd April 2016
  #16
Gear Maniac
 

Quote:
Originally Posted by David Spearritt View Post
....but that the ultrasonic noise shaping in DSD cannot be heard. What this ultrasonic hash is doing to in-band audio is probably more significant than most are willing to admit, especially if it originates well upstream in the chain.
The unfiltered noise of 64fs DSD is in the area of -110dB at 20KHz, and rises to about -55dB at 100KHz. That noise envelope shifts up an octave at 128fs (~-110db at 40KHz), and two octaves at 256fs (~-110dB at 80KHz). The most important consideration though is the noise is uncorrelated, so does not produce modulation sidebands within the audio range.

Last edited by tailspn; 23rd April 2016 at 10:11 PM..