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Parametric Audio Coding in MPEG-4presented at NTNU, Trondheim, Norway, April 25, 2001 Heiko Purnhagen Laboratorium für Informationstechnologie, University of Hannover, Germany OutlineParametric modelling provides an efficient representation of general audio signals and is suitable for very low bit rate audio coding. It is based on the decomposition of an audio signal into components which are described by appropriate source models and represented by model parameters. Perception models are utilised in signal decomposition and model parameter coding. This talk starts with an overview of the MPEG-4 Audio standard, followed by a brief tutorial on parametric audio coding. The "Harmonic and Individual Lines plus Noise" (HILN) tools as defined in MPEG-4 Audio are used to demonstrate advantages and challenges of parametric audio coding.
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