On 03/29/2011 02:11 PM, Archontis Politis wrote:
Hi,
there is also a small study and listening test results that some
colleagues published on the 126th AES convention on the effect of
reverberation on ambisonic reproduction:
"The effect of listening room on audio quality in Ambisonics
reproduction" (2009)
Olli Santala, Heikki Vertanen, Jussi Pekonen, Jan Oksanen, and Ville Pulkki
The listening tests were done for ideal b-format signals, horizontal
decoding, with artificially changed reverberation, and the highest
listening test scores were found for direct-to-diffuse ratio of 1,
rather than anechoic conditions.
interesting pointer, thanks.
it should be noted that they are dealing with first-order b-format
coloration artefacts, which will be worse than necessary in the system
under test since they are using an over-defined playback system (eight
speakers in the horizontal), a fact which they are aware of. their study
really is about masking these artefacts.
for listening room design, it might not be the best approach to maximise
the masking effect.
if you are mainly interested in the direct signal of an ambisonic
recording, adding pleasing room reflections is definitely the way to go.
in some cases however, when you are particularly interested in the room
ambience of a recording, a dryer room will be preferrable, particularly
if the recorded room has a shorter rt60 than the listening room, or the
recording is made outdoors.
i guess ultimately, a dryer room is more flexible, even if it is
subjectively less pleasing with "standard" material.
last year, i made a recording where the main microphone follows the
musicians from a large hall to an outdoor space. played back in a
concert hall with > 1.5 s RT60, the effect was totally masked by the
ambient reverberation of the listening room. in the SPIRAL with its RT60
of < 0.3s, the effect was quite striking.
btw, subjectively, i have found that "wet" recordings already mask some
of the coloration and phasiness, so it's not all due to the listening room.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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