Multiple pitch estimation using comb filters considering overlap of frequency components
Kyohei Tabata, Ryo Tanaka, Hiroki Tanji, Takahiro Murakami, Yoshihisa Ishida · The Journal of the Acoustical Society of America · 2014
We propose a method of the multiple pitch estimation using the comb filters for transcript. We can know the pitches of a musical sound by detecting the bigger outputs in comb filters connected in parallel. Each comb filter has peak corresponding to each pitch and its harmonic frequencies. The outputs of the comb filters corresponding to input pitch frequencies have bigger frequency components, and show bigger outputs than other comb filter’s ones. However, when there is the fundamental frequency of higher tone near harmonics of lower tones, the pitch estimation often fails. Therefore, the estimation is assigned to a wrong note when frequency components are shared. The proposed method estimates the correct pitch by correcting the outputs using the matrix, which is defined as the power ratio of the harmonic frequencies to the fundamental frequency. The effectiveness of our proposed method is confirmed by simulations. The proposed method enables more accurate pitch estimation than other conventional methods.