Fixed-Point Processing Optimization of Mpeg Audio Encoder Using Statistical Model

Lee KS, Park YC, Youn DH. Fixed-Point Processing Optimization of Mpeg Audio Encoder Using Statistical Model. In: AES Convention 122. Audio Engineering Society; 2007. Paper 7023. Available from: https://aes.org/publications/elibrary-page/?id=14008

@inproceedings{Lee2007_14008,
  author = {Lee, Keun-Sup and Park, Young-Cheol and Youn, Dae-Hee},
  title = {{Fixed-Point Processing Optimization of Mpeg Audio Encoder Using Statistical Model}},
  booktitle = {AES Convention 122},
  note = {Paper 7023},
  year = {2007},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=14008}
}

TY  - CPAPER
TI  - Fixed-Point Processing Optimization of Mpeg Audio Encoder Using Statistical Model
AU  - Lee, Keun-Sup
AU  - Park, Young-Cheol
AU  - Youn, Dae-Hee
T2  - AES Convention 122
M1  - Paper 7023
PY  - 2007
DA  - 2007/05/06
UR  - https://aes.org/publications/elibrary-page/?id=14008
PB  - Audio Engineering Society
LA  - en
AB  - Audio applications for portable devices have two critical restrictions: small size and low power consumption. Therefore, fixed-point implementations are essential for those applications. Even with a fixed-point processor, however, the data width still is an issue because it can affect both the hardware cost and power consumption. In this paper, we propose a statistical model for the MPEG AAC audio encoder that can provide an optimal precision for the implementation. The hardware with the optimal precision, being compared with the floating-point system, is supposed to have perceptually insignificant errors at its output. To have an optimal precision for the AAC encoder, we estimate the maximum allowable amount of fixed-point arithmetic errors in the bit-allocation process using the statistical model. Finally, we present a architecture for the system appropriate for encoding the audio signals with minimum errors by the fixed-point processing. Tests showed that the fixed-point system optimized using the proposed model had sound quality comparable to the floating-point encoding system.
ER  -