| Autor: |
Ruiz-Reyes, N., Rosa-Zurera, M., Lopez-Ferreras, F., Martınez-Munoz, D. |
| Zdroj: |
Circuits, Systems & Signal Processing; Dec2003, Vol. 22 Issue 6, p537-565, 29p |
| Abstrakt: |
This paper describes a new audio coding scheme based on adaptive wavelet analysis that provides transparent audio coding for CD-audio signals at low bit rates (≈1.4 bits/sample per channel). A new perceptual cost function is defined to obtain the best wavelet-packet base for each audio frame. The sharp variations in quantization noise that appear at the border of the frames are minimized by a novel approach that avoids overlapping. The proposed coder guarantees high perceptual quality using filters that generate wavelets of any compact support, because a bit-allocation algorithm that takes into account the equivalent filter frequency responses of the synthesis filter bank branches is used. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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