RESUMEN
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