Fricatives have noise sources that are filtered by the vocal tract and that typically possess energy over a much broader range of frequencies than observed for vowels and sonorant consonants. This paper introduces and refines fricative measurements that were designed to reflect underlying articulatory and aerodynamic conditions These show differences in the pattern of high-frequency energy for sibilants vs non-sibilants, voiced vs voiceless fricatives, and non-sibilants differing in place of articulation. The results confirm the utility of a spectral peak measure (FM) and low–mid frequency amplitude difference (AmpD) for sibilants. Using a higher-frequency range for defining FM for female voices for alveolars is justified; a still higher range was considered and rejected. High-frequency maximum amplitude (Fh) and amplitude difference between low- and higher-frequency regions (AmpRange) capture /f-θ/ differences in English and the dynamic amplitude range over the entire spectrum. For this dataset, with spectral information up to 15 kHz, a new measure, HighLevelD, was more effective than previously used LevelD and Slope in showing changes over time within the frication. Finally, isolated words and connected speech differ. This work contributes improved measures of fricative spectra and demonstrates the necessity of including high-frequency energy in those measures.
Refining and extending measures for fricative spectra, with special attention to the high-frequency rangea)
This paper is part of a special issue on Perception and Production of Sounds in the High-Frequency Range of Human Speech. Preliminary analyses were presented as part of the Special Session “Reintroducing the high-frequency region to speech perception research” at the 179th Meeting of the Acoustical Society of America (Acoustics Virtually Everywhere), December 2020, and at the 12th International Seminar on Speech Production, December 2020.
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Also at: Department of Communication Sciences and Disorders, Adelphi University, Garden City, NY 11530, USA.
Christine H. Shadle, Wei-Rong Chen, Laura L. Koenig, Jonathan L. Preston; Refining and extending measures for fricative spectra, with special attention to the high-frequency range. J. Acoust. Soc. Am. 1 September 2023; 154 (3): 1932–1944. https://doi.org/10.1121/10.0021075
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