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MPEG Audio Compression Future

  • Schuyler Quackenbush
Chapter

Abstract

We have seen that MPEG-1 and MPEG-2 Audio coders used perceptually shaped quantization noise as the primary tool for achieving compression. MPEG-4 High-Efficiency AAC [1] added parametric coding of the upper spectrum region with the Spectral Band Replication tool and parametric coding of two-channel signals with the Parametric Stereo tool. The MPEG-D standards MPEG Surround [2] and Spatial Audio Object Coding [3] incorporate parametric coding of the sound stage using level, time and coherence parameters for regions of the time/frequency signal. The common thread in all of these tools is that they model and exploit how humans perceive sound.

Keywords

Speech Signal Modify Discrete Cosine Transform Audio Code Code Tool Line Spectral Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The author thanks Bernhard Grill of Fraunhofer Institute for Integrated Circuits for providing to the author unpublished information on USAC from which several of the slides in this chapter were adapted. The author also gratefully acknowledges the help given by Bernhard Grill, Max Neuendorf and Markus Multrus of Fraunhofer Institute for Integrated Circuits; Roch Lefebvre and Philippe Gournay of Voiceage Corp. and University of Sherbrooke; and Heiko Purnhagen and Kristofer Kjörling of Dolby who did a careful review of the draft text and provided many constructive comments.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Audio Research LabsScotch PlainsUSA

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