The ISO/IEC MPEG-2 Audio NBC (Non-Backwards Compatible) audio coding work was started to provide MPEG-2 with the best audio quality at low bit rates without any restriction due to compatibility requirements. This paper describes the main features of the NBC advanced coding system (CD 13818-7). NBC combines the coding efficiency of a high-resolution filterbank, prediction techniques, and Huffman coding with additional functionalities aimed at delivering broadcast quality at very low bit rates (64 kb/s/channel).
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