In this paper, we conducted a subjective experiment in order to investigate that the naturalness of vibrato of singing voice is affected by fine fluctuation and global fluctuation. In this subjective experiment, listeners judged the naturalness of synthetic sounds with vibrato having fine fluctuation and global fluctuation or not having these fluctuations. It can be clarified that the cosine wave instead of a signal having fine fluctuation and global fluctuation can be used as a vibrato signal, because the naturalness of vibrato is not affected by these fluctuations.
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