This study investigates the effects of stress on the spectral properties of fricative noise in Standard Modern Greek (SMG). Twenty female speakers of SMG participated in the study. Fricatives were produced in stressed and unstressed positions in two vowel place positions: back and front vowels. Acoustic measurements were taken and the temporal and spectral properties of fricatives-using spectral moments-were calculated. Stressed fricatives are produced with increased duration, center of gravity, standard deviation, and normalized intensity. The machine learning and classification algorithm C5.0 has been employed to estimate the contribution of the temporal and spectral parameters for the classification of fricatives. Overall, duration and center of gravity contribute the most to the classification of stressed vs. unstressed fricatives.
This study examines the effects of stress, place of articulation (POA) and vowel context on Cypriot Greek voiceless singleton non-sibilant fricative duration, normalised intensity, centre of gravity, standard deviation, skewness, and kurtosis. The findings show significant effects of POA on all measurements. Moreover, there were significant effects of stress and vowel context on duration, centre of gravity, skewness, and kurtosis. To conclude, this study, provides the first instrumental/acoustic data on CG fricatives and advances our knowledge on the effects of stress and vowel context on the fricatives' acoustic structure.
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