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

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B.2. Definition of Levels for Audio Profiles

The levels for the audio profiles are specified using the complexity units previously defined. A number of zero stages of interleaving for the error-protection (EP) tool indicates that error protection is not used for that particular level.

The notation used to specify the number of audio channels indicates the number of full-bandwidth channels and the number of low-frequency enhancement channels. For example, 5.1 indicates 5 full-bandwidth channels and one low-frequency enhancement channel.

B.2.1. Main Profile

Since the Main profile includes natural and synthetic object types in MPEG-4 Audio Version 1, levels are defined as a combination of the two different types of levels using the two different ...

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