Perceptually motivated Sub-band Decomposition for FDLP Audio Coding
| Type of publication: | Conference paper |
| Citation: | Motlicek_TSD2008_2008 |
| Booktitle: | Text, Speech and Dialogue |
| Series: | Series of Lecture Notes in Artificial Intelligence (LNAI) |
| Volume: | 5246 |
| Year: | 2008 |
| Month: | 9 |
| Publisher: | Springer-Verlag Berlin, Heidelberg |
| Location: | Brno, Czech Republic |
| ISBN: | 978-3-540-87390-7 |
| Abstract: | This paper describes employment of non-uniform QMF decomposition to increase the efficiency of a generic wide-band audio coding system based on Frequency Domain Linear Prediction (FDLP). The base line FDLP codec, operating at high bit-rates (~136 kbps,',','), exploits a uniform QMF decomposition into 64 sub-bands followed by sub-band processing based on FDLP. Here, we propose a non-uniform QMF decomposition into 32 frequency sub-bands obtained by merging 64 uni- form QMF bands. The merging operation is performed in such a way that bandwidths of the resulting critically sampled sub-bands emulate the characteristics of the critical band filters in the human auditory system. Such frequency decomposition, when employed in the FDLP audio codec, results in a bit-rate reduction of 40% over the base line. We also describe the complete audio codec, which provides high-fidelity audio compression at ~66 kbps. In subjective listening tests, the FDLP codec outperforms MPEG-1 Layer 3 (MP3) and achieves similar qualities as MPEG-4 HE-AAC codec. |
| Keywords: | Audio Coding, Frequency Domain Linear Prediction (FDLP), speech coding |
| Projects: |
Idiap |
| Authors: | |
| Added by: | [UNK] |
| Total mark: | 0 |
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