Vocal shimmer during sustained phonation was measured in normal subjects and patients with laryngeal polyps, using the mean amplitude difference between consecutive cycles expressed in dB. A small laboratory computer was then used for measuring each discrete amplitude and for data processing. The results showed some overlap between the values for two groups studied, but nevertheless it appears ...

A study was undertaken to determine differences between jitter and shimmer in voices of children with different syndromes. Voices of 60 children, both sexes, aged 7-12 years were analysed by EZ Voice Analysis Software (program for jitter and shimmer measuring). The main purpose of this paper has diagnostic background. Obtained results show, which acoustical indicators of pathological voice are ...

Atrial fibrillation (AF) is the most common cardiac anomaly and one that potentially threatens human life. Due to its relation a variation in rhythm during indeterminate periods, long-term observations are necessary for diagnosis. With increase data volume, fatigue complexity of features make analysis an increasingly impractical process. Most medical diagnostic aid systems based on machine lear...

A first attempt at implementing a flexible model for the glottal source waveform of pathologic voices is described. The LF (Liljencrants & Fant) model is the source model used. We also add various noise types, shimmer and jitter to the excitation source in order to replicate more closely the pathologic glottal waveform. Various vocal characteristics are then modeled in order to evaluate the per...

PURPOSE To identify the immediate effects of voiced vibration and vocal fry exercises on healthy subjects by means of acoustic parameters and high-speed kymography. METHODS Thirty healthy subjects (18 women and 12 men, aged from 19 to 45 years old) participated in this study. The voices were recorded at the range of 44.100 samples/second, before and after of the vocal exercises. We developed ...

PURPOSE OF REVIEW This paper reviews recent evidence regarding the validity and reliability of acoustic voice analysis in routine clinical assessments. The current role of jitter and shimmer, the most-used indices, and how their clinical application might be improved are evaluated. RECENT FINDINGS Even though the evidence is limited, acoustic analysis is widely used to assist differential dia...

The authors implemented medialization thyroplasty with a customized silicone implant in a total of 43 operations (36 patients) in 1999-2003. In 5 of these patients, the medialization thyroplasty was combined with cricothyroid subluxation (3 cases) or adduction of arytenoid cartilage (3 cases). One patient received medialization thyroplasty, cricothyroid subluxation and adduction of arytenoid ca...