11.7. Summary
This chapter described the technology the MPEG-4 Audio standard provides for the coding of general audio signals (general audio coding), as opposed to specific signal classes, such as speech signals. Most of the MPEG-4 coding tools for general audio coding adhere to the paradigm of filterbank-based (T/F) coding of spectral coefficients in general and MPEG AAC in particular. Introduced within MPEG-2 Audio, the AAC coder is a powerful multichannel coder with a rich set of coding tools that allow the coder to adapt flexibly to arbitrary input signals. Building on this core technology, MPEG-4 defines a number of extensions to further enhance compression performance and support new modes of operation and functionalities.
The PNS tool ...
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