by Jürgen Herre and Heiko Purnhagen
Keywords: natural audio coding, audio coding tools, advanced audio coding, AAC, TwinVQ, T/F coding, transform coding, PNS, LTP, low-delay audio coding, parametric audio coding, HILN, BSAC, scalable audio coding, error resilience, error robustness
This chapter introduces the concepts and tools behind the MPEG-4 General Audio coding technology—that is, the coding algorithms within the MPEG-4 natural audio framework that are not targeted at specific types of audio signals but aim at the faithful reproduction of all types of input audio signals. This implies that encoding has to be done in a flexible way rather than relying on a specific source model.
Originally, the term general ...