This paper presents a scalable lossless enhancement of MPEG-4 Advanced Audio Coding (AAC). Scalability is achieved in the frequency domain using the Integer Modified Discrete Cosine Transform (IntMDCT), which is an integer approximation of the MDCT providing perfect reconstruction. With this transform, and only minor extension of the bitstream syntax, the MPEG-4 AAC Scalable codec can be extended to a lossless operation. The system provides bit-exact reconstruction of the input signal independent of the implementation accuracy of the AAC core coder. Furthermore, scalability in sampling rate and reconstruction word length is supported.

Authors: Geiger, Ralf; Schuller, Gerald; Herre, Jürgen; Sperschneider, Ralph; Sporer, Thomas
Affiliations: Fraunhofer IIS AEMT, Ilmenau, Germany ; Fraunhofer IIS, Erlangen, Germany(See document for exact affiliation information.)
AES Convention: 115 (October 2003) Paper Number: 5868
Publication Date: October 1, 2003
Subject: Low Bit-Rate Audio coding

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