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A new cost function to select the wavelet decomposition for audio compression.
| Content Provider | CiteSeerX |
|---|---|
| Author | Reyes, N. Ruiz Zurera, M. Rosa Ferreras, F. López Muñoz, D. Martínez Villafranca, J. M. |
| Abstract | This paper outlines a wavelet-based perceptual audio coding scheme that searches for the wavelet packet decomposition that minimizes a new perceptual entropy-type cost function computed in the wavelet domain. We are interested in decompositions adapted to the nature of audio signals, but attending to the characteristics of the human hearing system. We present results about audio coding with three different decomposition strategies. The first one uses a fixed wavelet tree structure which closely mimics a critical band decomposition, while the second and the third ones use adaptive wavelet trees obtained minimizing different cost functions. The results confirms that perceptual entropy based decomposition is the way you must take if you are looking for maximum compression rates and transparent coding. To achieve a further bit rate reduction ensuring transparent coding, our audio coder performs a filter order optimization, which is possible by using a novel algorithm to translate the psycho-acoustic information from the frequency to the wavelet domain. Experimental results indicate that our coder ensures transparent coding of monophonic CD quality audio signals at bit rates lower than 64 kbps. 1. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Transparent Coding Wavelet Domain Human Hearing System Fixed Wavelet Tree Structure Monophonic Cd Quality Audio Signal Bit Rate Reduction New Perceptual Entropy-type Cost Function Audio Signal Audio Coding Wavelet Packet Decomposition Perceptual Entropy Present Result Bit Rate Different Cost Function First One Adaptive Wavelet Tree Filter Order Optimization Third One Novel Algorithm Maximum Compression Rate Wavelet-based Perceptual Audio Audio Coder Psycho-acoustic Information Different Decomposition Strategy Experimental Result Critical Band Decomposition |
| Content Type | Text |
| Resource Type | Article |
