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In Reply to: still waiting for the validated double blind tests posted by Christine Tham on February 23, 2005 at 12:40:21:
to reiterate the context, we have two recordings of the output of a typical CD player, played through a typical pre-amp stage, with an inherent noise level of -80dBFS.Using a decibel calculator (http://www.csgnetwork.com/decibelamplificationcalc.html), the noise floor of the 16-bit recording is:
-80dB + -96dB = -79.89 dBFSFor 24-bit recording, assume an ADC with a S/N ratio of about 120dB (typical real world spec), the noise floor is:
-80dB + -120dB = -79.999 dBFSThe diffence between the two is about 0.11dB. This difference does NOT change regardless of how much you "boost" the signal, so it never becomes 1dB (threshold of audibility) no matter how hard you try.
Let me illustrate. Suppose you amplify the recordings so that 0dBFS = 100dB SPL. The noise levels for the respective recordings will be 20.11dB SPL and 20.001dB SPL respectively. This is well below the SPL noise floor of a typical room (40-60dB) or even a quiet studio (30-40dB) so you can't hear either noise levels.
If you "boost" this so that 0dBFS = 140dB SPL, now the noise levels are 60.11dB and 60.001dB SPL, and you can actually hear the noise level, but the difference between them is still 0.11dB. (But your hearing will be damaged by the excessive volume, assuming you've even got speakers and amplifiers capable of going up to this level.)
So, you will never be able to hear this 0.11dB difference under any circumstances. Understand??? I'm not being mystical, I do know what I'm talking about.
if dithering reduces distortion as you seem to think, it will make the difference narrower. do you still want to hold your position? :-)
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Follow Ups
- some explanation to help you understand why your point about "boosting" is invalid - Christine Tham 18:38:03 02/23/05 (0)
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