Re: [LAU] Rolling off high frequencies when mastering?

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To: <linux-audio-user@...>
Date: Sunday, April 25, 2010 - 2:44 pm


On Sunday 25 April 2010 03:31:33 Niels Mayer wrote:

yes, it is.

> What is the frequency at which these diffraction level effects produce

Just reading the abstract of that paper, they are looking at this range,
because it is in the transition range between where frequencies are completely
masked by the head, and where the sound waves easily bend around the head; and
they were prompted to look in more detail at the theoretical model, as they
found anomalies in localisation tests.
From what I understand from the introduction, in this paper they are looking
at a better way of modeling the signal path from the speakers to both ears,
and have come up with a model that takes into account diffraction, rather than
a model which just assumes that one ear is in the shadow zone.
They've then compared their modelled signals at the ears, with signal they
measured at listener's ears and found they were more in agreement.

I don't think they are ignoring any of the other effects, they are just
focusing on how thing works in this frequency range.

A regular method of science... reducing the problem at study to a specific
issue that you can control, and the issue that you have modelled and want to

> The part that doesn't make sense is that we can also localize sound

No one is denying that; not even the authors of that paper; it is just not
something they were studying in that specific paper.

Nor do I deny that. I only stated that for horizontal localisation, in the
higher frequency ranges interaural level differences play a role, more than
interaural time differences. Indeed for vertical and back/front localisation,
the pinnae shape is quite important.
You can test this yourself (well, you need one more person to help you), by
cupping your hands around your ears, folding your pinnae, closing your eyes
and having someone make some noises (shaking keys or something) at various
places around your head and let you pinpoint them.

Saying that one ear doesn't get certain high frequency content, doesn't mean
that we don't hear the high frequency... the other ear will get it.

oh, and you'll find some papers in the AES literature about pinna envy...

> One thing you might find interesting is that there is at least

Maybe for stereo hi-fi reproduction we don't want optimal localisation ;)
After all, not sitting in the sweet spot for a set of stereo speakers already
affects the perfect stereo listening experience. And.. since we're putting
these speakers normally at ear height, we are not interested in elevation cues
from them either.

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Messages in current thread:
Re: [LAU] Rolling off high frequencies when mastering?, Jörn Nettingsmeier, (Sat Apr 24, 3:12 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Niels Mayer, (Sun Apr 25, 7:31 am)
Re: [LAU] Rolling off high frequencies when mastering?, nescivi, (Sun Apr 25, 2:44 pm)