Pitch detection of musical sounds noticing minimum output of parallel connected comb filters

This paper proposes a simple pitch detection method using the parallel connected comb filters. We can know the pitches of a musical sound by detecting the smaller outputs in twelve comb filters connected in parallel. Each comb filter has zero points corresponding to each pitch and its harmonic frequencies, and so the outputs of the comb filters corresponding to input pitch frequencies have smaller frequency components, and show smaller outputs than other comb filter ones. We could detect the pitches with a probability of 98.2% for double tones and 91.1% for triple tones.