mmh, "Affiliation: Meridian Audio Ltd"?
-----Message d'origine-----
From: Vicki Melchior
Sent: Friday, February 06, 2015 2:21 PM
To: A discussion list for music-related DSP
Subject: Re: [music-dsp] Dither video and articles
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.
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