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In this paper we present an innovative tempo estimation system that processes acoustic audio signals and does not use any high level musical knowledge. Our proposal relies on a harmonic plus noise decomposition of the audio signal by means of a subspace analysis method. Then, a technique to measure the degree of musical accentuation as a function of time is developed and separately applied to the harmonic and noise parts of the input signal. This is followed by a periodicity estimation blockdoi:10.1155/2007/82795 fatcat:km33mhvijve33js7e32tcripw4