A Real-time Frame-based Multiple Pitch Estimaiton Method Using the Resonator Time- Frequency Image

In this paper, we describe a new method submitted to the 2007 Music Retrieval Evaluation eXchange (MIREX) Multiple Fundamental Frequency Estimation task. The Resonator Time-Frequency Image (RTFI) is used as the basic time-frequency analysis tool. The method makes a preliminary pitch estimation by a simple peak-picking operation in the pitch energy spectrum, which is produced from the original energy spectrum according to harmonic grouping principle. Then the incorrect estimations are cancelled according to some assumptions about harmonic structures of music notes played by commonly-used music instruments. The evaluation of this method under the MIREX task is also discussed.