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Efficient Fault Tolerant Search Techniques for Full-Text Audio Retrieval

In this paper we present several novel techniques for incorporating fault tolerance in content-based audio search. Our algorithms extend a recently proposed framework for fast index-based search in score-like audio material. Considering queries given as a sequence of notes and the task of matching those queries to a data base of musical tunes or melodies, we investigate possible deviations such a wrong notes, missing notes, or differences in the underlying tempo curves. It turns out that our fast index-based search methods may be quite naturally adapted to tolerate the former kinds of deviations, while the case of tempo changes requires a more careful treatment. Here, we propose a new technique for incorporating a tempo tracking mechanism into our fast search algorithms. Our methods have been successfully implemented and tested within a query-by-whistling application presented at the 2001 Internationale Funkausstellung (IFA) in Berlin, Germany. We describe this application and give an overview on our extensive tests.

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