Reduction of Artifacts in MPEG-AAC with MDCT Spectrum Regularization

Derrien O, Daudet L. Reduction of Artifacts in MPEG-AAC with MDCT Spectrum Regularization. In: AES Convention 116. Audio Engineering Society; 2004. Paper 6050. Available from: https://aes.org/publications/elibrary-page/?id=12754

@inproceedings{Derrien2004_12754,
  author = {Derrien, Olivier and Daudet, Laurent},
  title = {{Reduction of Artifacts in MPEG-AAC with MDCT Spectrum Regularization}},
  booktitle = {AES Convention 116},
  note = {Paper 6050},
  year = {2004},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=12754}
}

TY  - CPAPER
TI  - Reduction of Artifacts in MPEG-AAC with MDCT Spectrum Regularization
AU  - Derrien, Olivier
AU  - Daudet, Laurent
T2  - AES Convention 116
M1  - Paper 6050
PY  - 2004
DA  - 2004/05/06
UR  - https://aes.org/publications/elibrary-page/?id=12754
PB  - Audio Engineering Society
LA  - en
AB  - In the context of lossy audio coding, the power spectral density of stationary tones can be over/underestimated in some windows due to the time-shift sensitivity of the Modified Discrete Cosine Transform (MDCT), which leads to potentially audible coding artefacts. This paper discusses the advantages of using a nearly time-shift invariant regularized MDCT spectrum for the bit allocation in MPEG-AAC coder. We show how this modification applies to the standard iterative algorithm, as well as to a more efficient model-based framework. Objective and subjective results indicate that the overall quality is significantly improved when rich stationary sounds are encoded at low bit-rates, or when the coder operates in a variable bit-rate mode.
ER  -