Spectral Features for Perceptually Natural Phoneme Replacement by Another Speaker's Speech

DOI Web Site BIBCODE 参考文献31件
  • TAKOU Reiko
    NHK (Japan Broadcasting Corp.) Science and Technology Research Laboratories
  • SEGI Hiroyuki
    NHK (Japan Broadcasting Corp.) Science and Technology Research Laboratories
  • TAKAGI Tohru
    NHK Engineering Services, Inc.
  • SEIYAMA Nobumasa
    NHK (Japan Broadcasting Corp.) Science and Technology Research Laboratories

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The frequency regions and spectral features that can be used to measure the perceived similarity and continuity of voice quality are reported here. A perceptual evaluation test was conducted to assess the naturalness of spoken sentences in which either a vowel or a long vowel of the original speaker was replaced by that of another. Correlation analysis between the evaluation score and the spectral feature distance was conducted to select the spectral features that were expected to be effective in measuring the voice quality and to identify the appropriate speech segment of another speaker. The mel-frequency cepstrum coefficient (MFCC) and the spectral center of gravity (COG) in the low-, middle-, and high-frequency regions were selected. A perceptual paired comparison test was carried out to confirm the effectiveness of the spectral features. The results showed that the MFCC was effective for spectra across a wide range of frequency regions, the COG was effective in the low- and high-frequency regions, and the effective spectral features differed among the original speakers.

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