5th European Conference on Speech Communication and Technology

Rhodes, Greece
September 22-25, 1997

Acoustical Characteristics of Speech and Voice in Speech Pathology

Natalija Bolfan-Stosic, Mladen Hedjever

Acoustic Laboratory for Speech and Hearing, Department of Logopedics, Faculty of Defectology, University of Zagreb, Croatia

Thirty six hoarse voices of preschool children and fifty speech productions of school children was analyzed using an acoustic analysis by Bruel and Kjaer, Real-time Frequency Analyzer, Type 2123. Thirty six specific oscilograms of sustained vowel productions were divided to oscilograms shapes in three subgroups of specific shimmer values, inside the same group. The purpose of this part of our research is a help in recognition and usage of acoustical terms in diagnostic of disordered voices. Therefore, we obtained "staccato shimmer", the "narrow" total intensity or shimmer, and finally the "wide" shimmer with following oscillations of jitter. The differences in fundamental frequency and intensity between three subgroups of different shimmer were analysed using one-way variance analysis. The purpose of the second part of this research has been to examine and analyze temporal segments in normal and disordered speech. Temporal segments of school children's speech have been measured starting from the subsound level (VOT - voice onset time and SGD - stop gap duration), and also at the levels of sound, syllable and word. Principal axis analysis showed specific differences between normal and pathological speech in all types of variables.

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Bibliographic reference.  Bolfan-Stosic, Natalija / Hedjever, Mladen (1997): "Acoustical characteristics of speech and voice in speech pathology", In EUROSPEECH-1997, 1019-1022.