Quality Improvement of Very Low Bit Rate HE-AAC Using Linear Prediction Module

Lee G, Lee J, Park Y, Youn D. Quality Improvement of Very Low Bit Rate HE-AAC Using Linear Prediction Module. In: AES Convention 125. Audio Engineering Society; 2008. Paper 7624. Available from: https://aes.org/publications/elibrary-page/?id=14775

@inproceedings{Lee2008_14775,
  author = {Lee, GunWoo and Lee, JaeSeong and Park, YoungCheol and Youn, DaeHee},
  title = {{Quality Improvement of Very Low Bit Rate HE-AAC Using Linear Prediction Module}},
  booktitle = {AES Convention 125},
  note = {Paper 7624},
  year = {2008},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=14775}
}

TY  - CPAPER
TI  - Quality Improvement of Very Low Bit Rate HE-AAC Using Linear Prediction Module
AU  - Lee, GunWoo
AU  - Lee, JaeSeong
AU  - Park, YoungCheol
AU  - Youn, DaeHee
T2  - AES Convention 125
M1  - Paper 7624
PY  - 2008
DA  - 2008/10/06
UR  - https://aes.org/publications/elibrary-page/?id=14775
PB  - Audio Engineering Society
LA  - en
AB  - This paper proposes a new method of improving the quality of High Efficiency Advanced Audio Coding (HE-AAC) at very low bitrate under 16kbps. Low bitrate HE-AAC often produces obvious spectral holes inducing musical noise in low energy frequency bands, due to limited number of available bits. In the proposed system, a Linear Prediction (LP) module is combined with HE-AAC as a pre-processor to reduce the spectral holes. In its implementation, masking threshold of psychoacoustic model is normalized using the LP spectral envelope in prior to quantization of the LP residual. Also, in order to reduce the pre-echo, a block switching module is modified. Experimental results show that, at very low bitrate modes, the linear prediction module effectively reduces spectral holes, which results in reduction of musical noises of the conventional HE-AAC.
ER  -