Pitch estimation of polyphony based on controlling delays of comb filters for transcription

A new pitch estimation method for polyphony based on controlling the delays of comb filters is presented. This method takes the iterative process that extracts a period candidate from the output signal of cascaded comb filters and controls the delay of the comb filter with the extracted period candidate, until the same repetition of a set of extracted candidates is detected. The pitches of polyphony can be estimated from the set of obtained period candidates which makes the average magnitude difference function the minimum. Pitch estimation results for polyphony with this method are presented.