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This study investigated the effect of two forms of intensive speech treatment, (a) respiration (R) and (b) voice and respiration (Lee Silverman Voice Treatment [LSVT]), on the speech and voice deficits associated with idiopathic Parkinson disease. Forty-five subjects with Idiopathic Parkinson disease completed extensive pretreatment neurological,(More)
  • Y Horii
  • 1980
Vocal shimmer during the sustained phonation of /a/, /i/, /u/ was investigated for thirty-one adult male speakers using an automatic analysis program. The results showed an overall average shimmer of 0.39 dB with a critical value of 0.98 dB. Significant correlations were found among shimmer, jitter and fo standard deviation.
This study was primarily motivated by the need to establish the correspondence between auditory abilities and laryngeal function. Just noticeable differences (JNDs) were obtained for the open quotient and speed quotient of the glottal flow waveform. The quotients were synthesized for both the glottal flow alone, and for the output pressure signal after the(More)
Acoustic measures of phonatory instability (coefficient of variation for amplitude, coefficient of variation for frequency, shimmer, jitter, and harmonics-to-noise ratio), phonatory limits (maximum fundamental frequency range and maximum duration of vowel phonation), and the nasal-oral amplitude ratio were measured five times throughout a 6-month period(More)
  • Y Horii
  • 1983
This study investigated the correlation between a physical measure of oral-nasal coupling and perceived hypernasality in speech. A modified accelerometric method was utilized to extract distributional characteristics of a ratio of the nasal accelerometric amplitude to the voice amplitude during simulated hypernasal reading by 11 female talkers. Perceived(More)
Acoustic features of pharyngeal /s/ substitutions spoken by persons with cleft palate were measured using digital computer processing and analysis techniques. Average short-time spectral characteristics of pharyngeal /s/ sounds produced by four speakers with cleft palate were compared with spectral features of normally gestured /s/ sounds spoken by two(More)
  • Y Horii
  • 1979
The middle segments of sustained phonations of /i/, produced by six male adults at fo's ranging from 98 to 298 Hz, were examined for cycle-to-cycle frequency perturbation. The voice samples were analyzed by a peak-picking fo analysis program (Horii, 1975). The results showed that, between 98 Hz and 210 Hz, mean jitter size decreased as the fo increased,(More)
Audiotape recordings of sustained vowels produced by nine esophageal speakers were subjected to acoustic and perceptual analysis. Results indicated that (1) the magnitude of vocal jitter present in the vowels was substantially larger than that observed in normal speakers and speakers with laryngeal/vocal disturbance, (2) listeners could reliably rate the(More)