Bo-Erik Sandholm wrote:

When you think about it, that should have been a natural conclusion, the
physical distance from source to  the ears do change very little when the
source move in height.

I believe there is only at most 2 generic effects on the sound input to the
brain when a sound source moves in height.
 - the reflection from the shoulders create a combfilter effect in the
lower frequencies
 - the second effect is probably too individual to work with that is the
changing pattern dependant on the shape of the outer ear.

According to my knowledge anything above 4kHz is too individual to try and
take in to account for implementation in any binaural conversion program.
Not true. You can measure (or maybe calculate from 3D scans) personalised HRTF responses.

http://www.soundonsound.com/sos/jul13/articles/smyth-realiser-a8.htm

http://www.blueripplesound.com/personalized-hrtfs

AES69 files are still somewhat rare, the format has some rather complex features, and measured HRTFs have "quirks" depending on how they have been measured. Please let us know if you run into trouble, and please be aware that the behaviour of this feature of the software may change significantly in later versions.

-------------------

Anything done above 4kHz have a more than 90% chance to make it worse due
to individual ear shapes.
Which just means: Don't stop at generic solutions, at least not "forever".

Best,

Stefan


There have been stereo recording demos you can heard a wideband sourse move
in height, if I remember correctly it was banging on a metallic bucket or
jangling keys.

Best regards
Bo-Erik
On Dec 6, 2015 11:46 AM, "Jörn Nettingsmeier" <netti...@stackingdwarves.net>
wrote:

On 12/05/2015 05:26 PM, Stefan Schreiber wrote:

I wrote: "8-channel ... hedgehog", which is/was already some form of
educated guess.

See:


http://www.hauptmikrofon.de/HW/TMT2012_3DNaturalRecording_Theile_Wittek_2012_11.pdf
,

pg. 19.

This hedgehog layout really fits to the microphone openings of the Ozo
camera...

btw, since you're quoting this very interesting article, it has been
partly superseded by recent research of lee at al. at huddersfield (see
latest JAES), who found that there is _no_ vertical precendence effect and
that interchannel time differences in vertically spaced loudspeakers do not
contribute to localisation in any way. helmut is aware of this and has
presented a much more compact 8-channel mic array at ICSA 2015 in graz,
where the top and bottom mics are practically coincident.


--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487

Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT

http://stackingdwarves.net

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