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Identifier uch.csd.msc//2005karadimou
Title Μοντελοποίηση και Κωδικοποίηση Πολυκαναλικού Ήχου με χρήση ενός ΜοντέλουΠηγής/Φίλτρου, πολλαπλής κλίμακας
Alternative Title Multichannel Audio Modeling and Coding Using a Multiscale Source/FilterModel
Creator Karadimou, Kyriaki
Abstract During the last decade, stereophonic audio is progressively being commercially substituted by multichannel audio. The increase of the audio channels, both at the capturing and rendering sides, led to the creation of more realistic audio recordings that immerse the listener into the acoustic scene, but also increased the requirements for transmission data rates. For this reason, multichannel audio compression algorithms have been developed which not only reduce the intra-channel redundancies, but the inter-channel redundancies as well. These algorithms, while very effective, remain highly demanding for many practical applications. Therefore, this thesis proposes a source/filter model which divides the multichannel audio signal into two parts, a low-dimensional part that contains the microphone-specific information, and a high-dimensional part, which contains most of the inter-channel redundancy. By taking advantage of this redundancy among the channels we achieve very low data rate requirements, such as 10 kbps per channel for high quality coding (similar to the original recording). This is important, since our method allows the transmission of multichannel audio signals through low bandwidth channels such as the current Internet infrastructure or wireless networks for broadcasting. For comparison, current compression algorithms for multichannel audio such as Dolby AC-3 and MPEG-2 AAC have minimal bit rate requirements in the order of 64 kbits/sec/channel.
Issue date 2005-12-01
Date available 2006-01-23
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
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