Compander Domain Approach to Scalable AAC

Regunathan S, Rose K, Aggarwal A. Compander Domain Approach to Scalable AAC. In: AES Convention 110. Audio Engineering Society; 2001. Paper 5296. Available from: https://aes.org/publications/elibrary-page/?id=10011

@inproceedings{Regunathan2001_10011,
  author = {Regunathan, Shankar and Rose, Kenneth and Aggarwal, Ashish},
  title = {{Compander Domain Approach to Scalable AAC}},
  booktitle = {AES Convention 110},
  note = {Paper 5296},
  year = {2001},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=10011}
}

TY  - CPAPER
TI  - Compander Domain Approach to Scalable AAC
AU  - Regunathan, Shankar
AU  - Rose, Kenneth
AU  - Aggarwal, Ashish
T2  - AES Convention 110
M1  - Paper 5296
PY  - 2001
DA  - 2001/05/06
UR  - https://aes.org/publications/elibrary-page/?id=10011
PB  - Audio Engineering Society
LA  - en
AB  - We propose a new approach to achieve efficient scalability in audio coders, and demonstrate its performance using the MPEG-4 Advanced Audio Coder (AAC). In conventional scalable coding, the enhancement-layer performs straightforward re-quantization of the base-layer reconstruction error. This coding scheme implicitly discards useful information from the base-layer, and does not truly minimize a perceptually meaningful distortion criterion such as the noise-mask ratio. We reformulate the problem of scalable coding within a companding framework, and show that re-quantization in the compander's compressed domain achieves, in the asymptotic sense, optimal scalability. Based on this observation, we develop a scalable AAC coder which performs enhancement-layer quantization while exploiting all the information available at that layer. Simulation results of a two-layer scalable coder on the standard test database of 44.1kHz sampled audio show that the proposed approach yields substantial savings in bit rate for a given reproduction quality.
ER  -