Low-Power MPEG-4 HE-AAC Version-2 Encoder

Hsu HW, Lee WC, Liu CM, Yang CH. Low-Power MPEG-4 HE-AAC Version-2 Encoder. In: AES Convention 124. Audio Engineering Society; 2008. Paper 7338. Available from: https://aes.org/publications/elibrary-page/?id=14468

@inproceedings{Hsu2008_14468,
  author = {Hsu, Han-Wen and Lee, Wen-Chieh and Liu, Chi-Min and Yang, Chung-Han},
  title = {{Low-Power MPEG-4 HE-AAC Version-2 Encoder}},
  booktitle = {AES Convention 124},
  note = {Paper 7338},
  year = {2008},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=14468}
}

TY  - CPAPER
TI  - Low-Power MPEG-4 HE-AAC Version-2 Encoder
AU  - Hsu, Han-Wen
AU  - Lee, Wen-Chieh
AU  - Liu, Chi-Min
AU  - Yang, Chung-Han
T2  - AES Convention 124
M1  - Paper 7338
PY  - 2008
DA  - 2008/05/06
UR  - https://aes.org/publications/elibrary-page/?id=14468
PB  - Audio Engineering Society
LA  - en
AB  - In MPEG-4 HE-AAC version-2 encoder, the analysis/synthesis complex-exponential modulation filter banks are used in spectral band replication (SBR) and parametric stereo (PS) coding. Due to the aliasing interference, the complex banks instead of real banks are adopted in the SBR and PS coding. However, the additional overhead from the complex values in the CEMFB and the subsequent processing have led to high operational overhead. Our previous work has designed the SBR encoders based on the real-domain cosine modulation filter banks; we proposed a complexification-based approach for the SBR coding. This paper extends the work into PS coding. An approximate method for parameters estimation is proposed to save operational overhead with only one CEMFBanalysis channel. Also, a phase-adjustment down-mixing method is proposed to reduce energy vanish effects.
ER  -