The ISO/IEC MPEG-2 advanced audio coding (AAC) system was designed to
provide MPEG-2 with the best audio quality without any restrictions du
e to compatibility requirements. The main features of the AAC system (
ISO/IEC 13818-7) are described. MPEG-2 AAC combines the coding efficie
ncy of a high-resolution filter bank, prediction techniques, and Huffm
an coding with additional functionalities aimed to deliver Very high a
udio quality at a variety of data rates.