Inter-channel de-correlation for perceptual audio coding |
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Authors: | Soledad Torres-Guijarro Jon A Beracoechea-Álava Luis I Ortiz-Berenguer F Javier Casajús-Quirós |
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Institution: | Grupo de Aplicaciones del Procesado de Señales, Departamento de Señales, Sistemas y Radiocomunicaciones, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain |
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Abstract: | Sound reproduction is evolving towards multi-channel systems with a growing number of channels. Consequently, high quality multi-channel codecs are required. Last generation perceptual audio codecs, represented by MPEG advanced audio coder (AAC), can efficiently code typical surround multi-channel material but may benefit from a previous block of inter-channel de-correlation, for certain audio recordings. These recordings present high correlation between non-symmetric channels, or correspond to loudspeaker arrangements different from surround, such as linear loudspeaker arrays. In order to valuate the advantages of this new coding approach, a multi-channel perceptual quality measure is developed. |
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Keywords: | Multi-channel audio coding Perceptual quality Inter-channel de-correlation Karhunen-Loeve transform Linear microphone array |
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