Pitch Detection of Duet Song using Double Comb Filters

This paper proposes a new method for the pitch detection of a duet song for transcription. The previous pitch detection methods that are considered most for musical instrument sounds but few for sung songs are based on the extraction of the pitch frequencies. But the extraction of the pitches is difficult since the musical sound has many harmonic components. The principle of our method is the elimination of the pitch and its harmonic frequencies. This is performed simply by a comb filter. To adapt the fluctuation of song pitches, we use a double comb filter(DCF). Using two cascade connected twelve DCFs that are connected in parallel and are corresponding to each tone in one octave, we can detect the pitches of a duet song.