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A technique for detecting the pitches of a polyphonic signal is presented. The system utilises modified IIR comb filters, which are generated to ensure that a null (stop band notches) exists at multiples of note frequencies and that a very flat pass band is present in the remain of the spectrum. Thus, the signal spectrum is not distorted after applying the filters to the audio signal, which is the case when using FIR comb filters. the presented approach improves upon an existing multi pitch detection model based on a FIR comb filter framework.
Gainza, M., Lawlor, R. & Coyle, E. (2005) Multi pitch estimation by using IIR comb filters. 47th. International Symposium focused on Multimedia Systems and Applications (ELMAR), Zadar, 2005.