The following published double blind test contradicts the results of the old Moran/Meyer publication in showing (a) that the differences between CD and higher resolution sources is audible and (b) that failure to dither at the 16th bit is also audible.
http://www.aes.org/e-lib/browse.cfm?elib=17497 The Moran/Meyer tests had numerous technical problems that have long been discussed, some are enumerated in the above. As far as dithering at the 24th bit, I can't disagree more with a conclusion that says it's unnecessary in data handling. Mastering engineers can hear truncation error at the 24th bit but say it is subtle and may require experience or training to pick up. What they are hearing is not noise or peaks sitting at the 24th bit but rather the distortion that goes with truncation at 24b, and it is said to have a characteristic coloration effect on sound. I'm aware of an effort to show this with AB/X tests, hopefully it will be published. The problem with failing to dither at 24b is that many such truncation steps would be done routinely in mastering, and thus the truncation distortion products continue to build up. Whether you personally hear it is likely to depend both on how extensive your data flow pathway is and how good your playback equipment is. Vicki Melchior On Feb 5, 2015, at 10:01 PM, Ross Bencina wrote: > On 6/02/2015 1:50 PM, Tom Duffy wrote: >> The AES report is highly controversial. >> >> Plenty of sources dispute the findings. > > Can you name some? > > Ross. > -- > dupswapdrop -- the music-dsp mailing list and website: > subscription info, FAQ, source code archive, list archive, book reviews, dsp > links > http://music.columbia.edu/cmc/music-dsp > http://music.columbia.edu/mailman/listinfo/music-dsp -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
