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MPEG-4 Book, The by Touradj Ebrahimi, Fernando Pereira

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D.3. 3D Audio Profile

The 3D Audio scene graph profile provides for a set of BIFS scene graph elements for usage in audio-only applications.

Levels 1 to 4

The levels specified in Table D.6 are based on a sampling rate of 44,100 Hz at 16-bit resolution [N4264].

Table D.6. Restrictions for the 3D Audio profile at Levels 1 to 4
 Level 1Level 2Level 3Level 4
Maximum number of spatialized sources per scene[1]83264128
Number of temporal sections whose levels and time limits can be controlled individually for each source1123
Maximum number of independent late reverberation processes per scene1124
Maximum number of control frequencies in reverberation process filters, source directivity filters, and material filters2233

[1] These spatialized sources can include ...

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