Chord segmentation and recognition using EM-trained hidden markov models

Automatic extraction of content description from commercial audio recordings has a number of important applications, from indexing and retrieval through to novel musicological analyses based on very large corpora of recorded performances. Chord sequences are a description that captures much of the character of a piece in a compact form and using a modest lexicon. Chords also have the attractive property that a piece of music can (mostly) be segmented into time intervals that consist of a single chord, much as recorded speech can (mostly) be segmented into time intervals that correspond to specific words. In this work, we build a system for automatic chord transcription using speech recognition tools. For features we use “pitch class profile” vectors to emphasize the tonal content of the signal, and we show that these features far outperform cepstral coefficients for our task. Sequence recognition is accomplished with hidden Markov models (HMMs) directly analogous to subword mod...

• Type: Conference
• Year: 2003
• Where: ISMIR
• Authors: Alexander Sheh, Daniel P. W. Ellis
• Keywords: Automatic Chord Transcription, Chord Sequences, ISMIR 2003, Time Intervals