Acoustic correlates of breathy vocal quality.

@article{Hillenbrand1994AcousticCO,
  title={Acoustic correlates of breathy vocal quality.},
  author={James M. Hillenbrand and R A Cleveland and R L Erickson},
  journal={Journal of speech and hearing research},
  year={1994},
  volume={37 4},
  pages={
          769-78
        }
}
The purpose of this study was to evaluate the effectiveness of several acoustic measures in predicting breathiness ratings. Recordings were made of eight normal men and seven normal women producing normally phonated, moderately breathy, and very breathy sustained vowels. Twenty listeners rated the degree of breathiness using a direct magnitude estimation procedure. Acoustic measures were made of: (a) signal periodicity, (b) first harmonic amplitude, and (c) spectral tilt. Periodicity measures… 

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