New Low Bit-Rate Audio Coding Approach Based on Adaptive Wavelet Analysis |
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Authors: | N Ruiz-Reyes M Rosa-Zurera F Lopez-Ferreras and D Martnez-Munoz |
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Affiliation: | (1) Electronic Department, University of Jaen, Polytechnical School, Linares (Jaen), Spain;(2) Signal Theory and Communication Department, University of Alcala, Polytechnical School, Alcala de Henares (Madrid), Spain |
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Abstract: | 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. |
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