Abstract
This paper presents a new strategy to estimate pitches in mixed musical tones in which harmonic components of each tone overlap. Our system based on the temporal approach can estimate pitches with a high time resolusion by using comb filters, which elimainate corresopnding harmonic components, and auto-correlation functions, which reveals the periodicity of a harmonical signal. When a comb filter corresponding to one tone which is contained in the singal eliminates its harmonic compnents, the residue signal consists of harmonic components of another tone. Then another pich can be estimated by detecting a periodicity from auto-correlation functions of the residue signal. Therefore, this system means an attempt to find comb filters which eliminate one of each tone by observing a behavior of auto-correlation functions showing a single tone's one, and estimates pitches. Pich estimation results with this sytem for polyphony are presented and accuraacy is investigated.
