This paper describes a mechanism to improve the sound classification algorithm included in the MPEG-7 standard without modifying or extending it. The sequential classification is turned into a hierarchical classification. Thereby it is possible to adopt the classification algorithm more flexible to the characteristics of the sound classes. This paper also gives a detailed view on how the algorithm is implemented using a XML database to store and request content information of the audio signals and model descriptions of sound classes using the MPEG-7 standard.
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