Fundamental frequency, jitter, and shimmer of adult stutters and nonstutters' voice

Objective measurement is general and acoustic measurements in particular have become a substantial aspect of stuttering assessment during the last few decades. Measurements do not replace the perceptual judgment, but they allow a more precise diagnosis, provide more evidence for therapeutic interventions, and are useful as feedback for patients in therapy. The purpose of this investigation was to compare some adult male stutterers' and nonstutterers' acoustic features. Adult male stutterers and nonstutterers participated this case-control study. Their fluent reading of 20 sentences in Farsi, prolongation of vowels/a/ and/i/, and rhythmic counting from 1 to 20 were analyed with Dr. Speech software. There were no significant differences between two groups in fundamental frequency [f[0]] and standard deviation of f0 in three speech samples [vowels/a/ and/i/, reading 20 sentences, and rhythmic counting from 1 to 20]. No significant difference were between two groups for jitter and shimmer. Non significant differences between two groups are somewhat due to investigation of this parameters in fluent speech of stutterers and nonstutterers

[Fundamental frequency in males and females voice from Iranian, Turk, and Kurd race]

Human-s voice is observable and measurable like his other behaviors. Investigations have shown that characteristics of voice differ in males and females and possibly in different languages. Clinically, knowing natural voice characteristics is helpful for distinguishing voice pathologies. So the purpose of this study was to measure and compare the fundamental frequency human voice. Subjects were young males and females of Iranian Fars, Turk and Kurd races. First the subjects were asked to read some Persian sentences, and then their voice samples were analyzed by Dr. Speech software. Fundamental frequency mean is 168 +/- 46 Hz and 120 +/- 48 Hz for females and males, respectively, which shows significant difference. There is no significant difference between fundamental frequency mean of different races. There is significant difference between fundamental frequency of males and females, but this difference is not attributable to their mother tongue