Automatic Chord Estimation from Audio: A Review of the State of the Art
IEEE/ACM Transactions on Audio, Speech and Language Processing (TASLP)
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We present an approach to the extraction of frequencies corresponding to chords in western polyphonic music. In the first phase of this approach constant-Q spectral analysts directly provides the features from which the fundamental frequencies for 43 of the 57 possible categories of chords can be extracted without ambiguity. Each remaining chord category has a potential ambiguity associated with it because of frequency resolution problems The second phase of our approach is designed to address such ambiguities. A software implementation of our approach was used successfully to validate its performance on a representative set of polyphonic musical signals.