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EURASIP Journal on Audio, Speech, and Music Processing
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Perceptual Continuity and Naturalness of Expressive Strength in Singing Voices Based on Speech Morphing

EURASIP Journal on Audio, Speech, and Music Processing volume 2007, Article number: 023807 (2007) Cite this article

Abstract

This paper experimentally shows the importance of perceptual continuity of the expressive strength in vocal timbre for natural change in vocal expression. In order to synthesize various and continuous expressive strengths with vocal timbre, we investigated gradually changing expressions by applying the STRAIGHT speech morphing algorithm to singing voices. Here, a singing voice without expression is used as the base of morphing, and singing voices with three different expressions are used as the target. Through statistical analyses of perceptual evaluations, we confirmed that the proposed morphing algorithm provides perceptual continuity of vocal timbre. Our results showed the following: (i) gradual strengths in absolute evaluations, and (ii) a perceptually linear strength provided by the calculation of corrected intervals of the morph ratio by the inverse (reciprocal) function of an equation that approximates the perceptual strength. Finally, we concluded that applying continuity was highly effective for achieving perceptual naturalness, judging from the results showing that (iii) our gradual transformation method can perform well for perceived naturalness.

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Author information

Affiliations

  1. ATR Intelligent Robotics and Communication Laboratories, 2-2-2 Hikaridai, Keihanna Science City, Kyoto, 619-0288, Japan

    Tomoko Yonezawa, Shinji Abe & Kenji Mase

  2. Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8601, Japan

    Tomoko Yonezawa & Kenji Mase

  3. ATR Media Information Science Laboratories, 2-2-2 Hikaridai, Keihanna Science City, Kyoto, 619-0288, Japan

    Tomoko Yonezawa & Shinji Abe

  4. National Institute of Information and Communication Technology/ATR Cognitive Information Science Laboratories, 2-2-2 Hikaridai, Keihanna Science City, Kyoto, 619-0288, Japan

    Noriko Suzuki

  5. ATR Knowledge Science Laboratories, 2-2-2 Hikaridai, Keihanna Science City, Kyoto, 619-0288, Japan

    Kiyoshi Kogure

Authors
  1. Tomoko Yonezawa
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  2. Noriko Suzuki
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  3. Shinji Abe
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  4. Kenji Mase
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  5. Kiyoshi Kogure
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Corresponding author

Correspondence to Tomoko Yonezawa.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yonezawa, T., Suzuki, N., Abe, S. et al. Perceptual Continuity and Naturalness of Expressive Strength in Singing Voices Based on Speech Morphing. J AUDIO SPEECH MUSIC PROC. 2007, 023807 (2007). https://doi.org/10.1155/2007/23807

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Keywords

  • Acoustics
  • Transformation Method
  • Absolute Evaluation
  • Natural Change
  • Gradual Transformation