I used to bring this stuff up as a reason why early
CD did not sound good--that there were possible
nonlinearities that made the missing content
above 21 kHz actually missed.
Onkyo had a player that put content in above
21k that was only vaguely related to
the inut signal! Sounded good too.
But eventually I decided this was wrong.
I do not think it had anything to do with the
problems. Paul F's analysis is much more
likely. Nonlinearities there are, but
I do not think that content above 21k amounts
to anything important and likely it is not
even audible. Hard to be absolutely sure, however!
Robert
On Mon, 23 Jul 2012, Sampo Syreeni wrote:
On 2012-07-06, Peter Stitt wrote:
I'm basically writing to ask if one of Michael Gerzon's papers "Nonlinear
Models for Auditory Perception" has made it into circulation. I'm guess it
hasn't, which is a shame, but I thought I should ask here before I gave up.
I see it has been reference by Dubnov, Tishby and Cohen (1995) in "Hearing
Beyond the Spectrum" but that's about the only one I can find.
What was the precise context of the reference? Gerzon seems to have dealt
with two different nonlinear kinds of models: the aggregate psychoacoustic
ones which have to do with the development of ambisonic-like location models,
and somewhat less/later with the nonlinearity of auditory sensation as such.
My guess would be that the manuscript you're searching for is of the latter
kind, because the former framwork had already been perfected at least on the
theoretical front long before.
If so, I'm guessing his coauthors in noise-shaped dither and Meridian
Lossless Packing ought to know something. Say, Peter Craven, because in-band
noise-shaping as a highly nonlinear and difficult to control process easily
goads you towards that kind of thinking. And then MLP because it was somewhat
tied in with Acoustical Renaissance for Audio within the DVD-A debates of the
time, at least in the debate over the relevance of as-such unhearable
ultrasonics still possibly having some different, nonlinear pathway by which
they might affect spatial hearing (e.g. by attacking the
known-to-be-nonlinear and different dichotic transient detection pathway we
have). If so, someone at Meridian at the time, maybe even Bob Stuart, might
have some idea of where to find a copy.
I imagine it's a fascinating paper and a shame that it may never see the
light of day.
I'd really like to see a copy surface. If not else, to be digitized and once
again at least put online as part of the Motherlode. But that stuff is highly
interesting to me in other regards as well... Anybody, ideas?
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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