Categories or classification schemes offer ways of navigating and higher control over the search and retrieval of audio content. The MPEG-7 standard provides description mechanisms and ontology management tools for multimedia documents. We have implemented a classification scheme for sound effects management inspired on the MPEG-7 standard on top of an existing lexical network, WordNet. WordNet is a semantic network that organizes over 100.000 concepts of the real world with links among them. We show how to extend WordNet with the concepts of the specific domain of sound effects. We review some of the taxonomies to describe acoustically sounds. Mining legacy metadata from sound effects libraries further supplies us with terms. The extended semantic network includes the semantic, perceptual and sound effects specific terms in an unambiguous way. We show the usefulness of the approach easing the task for the librarian and providing higher control on the search and retrieval for the user.
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