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F0 stylization in speech: straight lines versus parabolas
The Journal of the Acoustical Society of America
|December 1, 1991
Summary
Piecewise linear approximations of speech F0 curves are perceptually as effective as parabolic approximations. Listeners could not reliably distinguish between linear and parabolic shapes, even with flattened peaks.
Area of Science:
- Speech processing
- Acoustic phonetics
- Perceptual linguistics
Background:
- Investigating the perceptual equivalence of different F0 curve approximations in speech synthesis.
- Comparing piecewise linear approximations with parabolic approximations for F0 contour representation.
Discussion:
- Auditory perception of speech F0 contours is robust to variations in approximation methods.
- The perceptual impact of visual fit does not necessarily correlate with auditory discrimination.
- Flattened peaks in linear approximations do not significantly hinder perceptual differentiation from parabolic shapes.
Key Insights:
- Piecewise linear F0 curve approximations are perceptually sufficient and not inferior to parabolic ones.
- Listeners exhibit limited ability to distinguish between linear and parabolic F0 contours.
- The perceptual quality of speech is maintained despite simpler linear approximations.
Outlook:
- Further research into optimal F0 contour representation for speech synthesis.
- Exploring the perceptual boundaries of other speech parameters.
- Investigating the role of context in the perception of F0 variations.