Enhanced Mpeg-4 Low Delay AAC - Low Bitrate High Quality Communication

Geiger R, Herre J, Jander M, Multrus M, Schmidt M, Schnell M, Schuller G. Enhanced Mpeg-4 Low Delay AAC - Low Bitrate High Quality Communication. In: AES Convention 122. Audio Engineering Society; 2007. Paper 6998. Available from: https://aes.org/publications/elibrary-page/?id=13983

@inproceedings{Geiger2007_13983,
  author = {Geiger, Ralf and Herre, Jürgen and Jander, Manuel and Multrus, Markus and Schmidt, Markus and Schnell, Markus and Schuller, Gerald},
  title = {{Enhanced Mpeg-4 Low Delay AAC - Low Bitrate High Quality Communication}},
  booktitle = {AES Convention 122},
  note = {Paper 6998},
  year = {2007},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=13983}
}

TY  - CPAPER
TI  - Enhanced Mpeg-4 Low Delay AAC - Low Bitrate High Quality Communication
AU  - Geiger, Ralf
AU  - Herre, Jürgen
AU  - Jander, Manuel
AU  - Multrus, Markus
AU  - Schmidt, Markus
AU  - Schnell, Markus
AU  - Schuller, Gerald
T2  - AES Convention 122
M1  - Paper 6998
PY  - 2007
DA  - 2007/05/06
UR  - https://aes.org/publications/elibrary-page/?id=13983
PB  - Audio Engineering Society
LA  - en
AB  - The MPEG-4 Low Delay Advanced Audio Coding (AAC-LD) scheme has recently evolved into a popular algorithm for audio communication. It produces excellent audio quality at bitrates between 64kbit/s and 48kbit/s per channel. This paper introduces an enhancement to AAC-LD which reduces the bitrate demand by 25-33%. This is achieved by adding a combination of a delay-optimized version of the Spectral Band Replication (SBR) tool and by utilizing a dedicated low delay filterbank. The introduced techniques maintain the high audio quality and offer an algorithmic delay low enough for use in two way communication systems. This paper describes the coder enhancements including a detailed discussion of algorithmic delay issues, a performance assessment and possible applications.
ER  -