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panorama 3d acoustic room modeling

Posted: 14 May 2007 03:40 AM   [ Ignore ]  
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i am a new user recently got into the fantastic world of panorama! it is a unique extraordinary product!
congratulations to the team and to William Gardner for his excellent paper “3D audio and acoustic environment modeling”. i think along with the Spatialisateur by IRCAM is the best program of its kind.

currently as a researcher and academic i am investigating the possibilities of Panorama in a creative artistic context as a part of my phd thesis during my experiments a few queries came up and i was wondering if i could receive some help form the wave arts team.

in a case study an acoustic environment and motion of sound sources in the given space through midi automation is emulated.

If the listening position in the given space ( a 1.75m tall individual) is centered in a 3m height room (distance from floor to ceiling) what measures should be introduced using Cartesian coordinates to the top and bottom reflexion distance parameters of panorama? i understand the range is 1-20 meters but what is the practical reference?1 meter from the virtual listener’s ears?

does the sound source motion requires the activation of doppler effect, even though
the source is approaching the listener’s position in a low speed with direct slope set to -4 db.

moreover in an attempt to visualize the given space in the program’s environment the 3D room view is engaged. In the power suite manual p100 in the 3D room view it is mentioned that the rear wall is drawn in purple, though when automating the back distance knob the rear purple wall of the graph was left unaffected and the front wall (opposite to the purple) was automated. is the parameters correspondence not right?

any advice would be extremely helpful and appreciated. i hope other users would find these questions useful
best

window d
University of London

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Posted: 26 June 2007 10:35 AM   [ Ignore ]   [ # 1 ]  
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Hi Window,

Wall reflection distances are from the listener (at the origin), hence you should use ceiling distance of 1.25 m and floor distance of 1.75 m.

Doppler is not needed for low source speeds.

The slope of -4 dB is not physically accurate but gives reasonable sounding results. You may want to use -6 dB if you want to simulate physical acoustics.

Thanks for pointing out the error in the manual. Clearly the purple wall is the front wall.

Best regards,

Bill

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Bill Gardner
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