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.
CITATION STYLE
Quackenbush, S. (2012). MPEG audio compression future. In The MPEG Representation of Digital Media (Vol. 9781441961846, pp. 141–159). Springer New York. https://doi.org/10.1007/978-1-4419-6184-6_8
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