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 [BibTeX] [Marc21]
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 Motlicek, Petr
Ganapathy, Sriram
Hermansky, Hynek
Garudadri, Harinath
Athineos, Marios
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  • Motlicek_TSD2008_2008.pdf