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Forgot to mention, most PCM dithering algorithms generate similar ultrasonic noise

Chances are, if you are listening to a PCM recording that has undergone dither at some stage in it's lifecycle, it will contain ultrasonic noise, in many cases similar to DSD ultrasonic noise.

Check out the following URL for comparisons of noise shaping curves for various dithering algorithms. What the diagrams don't show of course is that the noise shaping continues into the ultrasonics, and most algorithms work on the principle of shifting noise from the audible band up into the ultrasonic spectrum.

In this respect, DSD is no better or worse than any of the commonly used algorithms.


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