Appendix B. Levels for Audio Profiles
by Fernando Pereira
Keywords: audio profile, audio level, conformance
This appendix includes the profiles and levels specified in MPEG-4 Audio both in Version 1 and in Version 2 [MPEG4-3]. The MPEG-4 Audio standard defines (as of October 2001) 23 object types and 8 profiles as explained in Chapter 13.
Four audio profiles have been defined in MPEG-4 Audio Version 1: Main, Scalable, Speech, and Synthetic. Four additional profiles were specified in MPEG-4 Audio Version 2: High-Quality Audio, Low-delay Audio, Natural Audio, and Mobile Audio Internetworking (MAUI).
Tables 13.3 and 13.4 show which audio coding tools include each audio object type and which audio object types include each audio profile.
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