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In Reply to: RE: The dithering is from 64-bits to 24-bits posted by Tony Lauck on July 02, 2009 at 10:35:55
"Are you suggesting that adding dither at 24 bits hurts the sound?"
I stated it wasn't necessary. At best, it wouldn't impact the sound at all. At worst, if there is a rounding issue involved (unlikely), it could alter the signal. It could also raise noise levels under some circumstances. Because at these levels, the dither will be only acting on the ambient noise, not the signal.
My contention is, why use something if it isn't needed? In audio, if it isn't needed, it *might* (not necessarily will) degrade sound.
"When do you think dither should be used?"
I would guess truncating to 18 or fewer bits.
To get a better answer to this question, this is a case where DBT evaluation would be valuable. Determine, by blind listening evaluation, where the threshold of audibility is for dither, as a function of wordlength.
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