Directivity Extension

Version 32 (Nils Peters, 06/02/2009 03:33 pm)

1 1 Nils Peters
h1. Directivity Extension
2 1 Nils Peters
3 1 Nils Peters
    * Orientation of entity (Yaw, Pitch, Roll)
4 1 Nils Peters
    * Directivity model ...... there are different models out there, what might be the best?
5 1 Nils Peters
          o AudioTwist
6 1 Nils Peters
          o Spatialisateur (aperture)
7 1 Nils Peters
          o Space Unit Generator
8 6 Nils Peters
          o openAL, directX 
9 1 Nils Peters
          o X3D (ellipsoids)
10 1 Nils Peters
          o CATT-Acoustics (SD0, SD1, SD2 file format)
11 1 Nils Peters
          o Common Loudspeaker File Format (CLF)
12 2 Nils Peters
13 22 Nils Peters
h1. Review
14 2 Nils Peters
15 31 Nils Peters
16 31 Nils Peters
h2. [[Spatialisateur]] 
17 31 Nils Peters
18 31 Nils Peters
h2. [[Space Unit Generator]]
19 31 Nils Peters
20 31 Nils Peters
!SUG.gif!
21 31 Nils Peters
22 32 Nils Peters
h2. ViMiC
23 32 Nils Peters
24 32 Nils Peters
25 31 Nils Peters
h2. AudioTwist
26 31 Nils Peters
27 31 Nils Peters
28 2 Nils Peters
h2. "OpenAL":http://connect.creativelabs.com/openal/default.aspx
29 5 Nils Peters
30 7 Nils Peters
??ability to simulate realistic directivity characteristics by either *specifying parametric filtering associated to radiation angles*, or *triplets of angle, frequency and attenuation*.?? 
31 7 Nils Peters
       (Jean Marc Jot, "Scene Description Model and Rendering Engine for Interactive Virtual Acoustics", 120th AES Convention)
32 7 Nils Peters
33 24 Nils Peters
h2. "X3D":http://libx3d.sourceforge.net/ISO-IEC-19775-X3DAbstractSpecification/index.html  Sound Node
34 7 Nils Peters
35 21 Nils Peters
36 18 Nils Peters
    * Inner ellipsoid defines a volume of space in which the maximum level of the sound is audible. Within this ellipsoid, the normalized sample data is scaled by the intensity field and there is no attenuation. The inner ellipsoid is defined by extending the direction vector through the location. The @minBack@ and @minFront@ fields specify distances behind and in front of the location along the direction vector respectively. The inner ellipsoid has one of its foci at location (the second focus is implicit) and intersects the direction vector at @minBack@ and @minFront@.
37 18 Nils Peters
38 32 Nils Peters
* Outer ellipsoid defines a volume of space that bounds the audibility of the sound. No sound can be heard outside of this outer ellipsoid. The outer ellipsoid is defined by extending the direction vector through the location. The @maxBack@ and @maxFront@ fields specify distances