Models and analysis of vocal emissions for biomedical applications

This book of Proceedings collects the papers presented at the 3rd International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 2003, held 10-12 December 2003, Firenze, Italy. The workshop is organised every two years, and aims to stimulate contacts between specialists active in research and industrial developments, in the area of voice analysis for biomedical applications. The scope of the Workshop includes all aspects of voice modelling and analysis, ranging from fundamental research to all kinds of biomedical applications and related established and advanced technologies

Influence of analyzed sequence length on parameters in laryngeal high-speed videoendoscopy

Laryngeal high-speed videoendoscopy (HSV) allows objective quantification of vocal fold vibratory characteristics. However, it is unknown how the analyzed sequence length affects some of the computed parameters. To examine if varying sequence lengths influence parameter calculation, 20 HSV recordings of healthy females during sustained phonation were investigated. The clinical prevalent Photron Fastcam MC2 camera with a frame rate of 4000 fps and a spatial resolution of 512 x 256 pixels was used to collect HSV data. The glottal area waveform (GAW), describing the increase and decrease of the area between the vocal folds during phonation, was extracted. Based on the GAW, 16 perturbation parameters were computed for sequences of 5, 10, 20, 50 and 100 consecutive cycles. Statistical analysis was performed using SPSS Statistics, version 21. Only three parameters (18.8%) were statistically significantly influenced by changing sequence lengths. Of these parameters, one changed until 10 cycles were reached, one until 20 cycles were reached and one, namely Amplitude Variability Index (AVI), changed between almost all groups of different sequence lengths. Moreover, visually observable, but not statistically significant, changes within parameters were observed. These changes were often most prominent between shorter sequence lengths. Hence, we suggest using a minimum sequence length of at least 20 cycles and discarding the parameter AVI

Development, perceptual evaluation, and acoustic analysis of amplitude-based F0 control in Electrolarynx speech

Thesis (Ph. D.)--Harvard-MIT Division of Health Sciences and Technology, 2009."September 2009." Cataloged from PDF version of thesis.Includes bibliographical references (p. 120-126).An Electrolarynx (EL) is a battery-powered device that produces a sound that can be used to acoustically excite the vocal tract as a substitute for laryngeal voice production. ELs provide laryngectomy patients with the basic capability to communicate, but current EL devices produce a mechanical speech quality which has been largely attributed to the lack of natural fundamental frequency (F0) variation. In order to improve the quality of EL speech, the present study aimed to develop and evaluate an automatic F0 control scheme, in which F0 was modulated based on variations in the root-mean-squared (RMS) amplitude of the EL speech signal. Recordings of declarative sentences produced by two male subjects before and after total laryngectomy were used to develop procedures for calculating F0 contours for EL speech, and perceptual experiments and acoustic analyses were conducted to examine the impact of F0 modulation on the quality and prosodic function of the EL speech. The results of perceptual experiments showed that modulating the F0 of EL speech using a linear relationship between amplitude and frequency made it significantly more natural sounding than EL speech with constant F0, but also revealed some limitations in terms of communicating linguistic contrasts (distinction between question vs. statement and location of contrastive stress). Results are interpreted in relation to the acoustic characteristics of F0 modified EL speech and discussed in terms of their clinical implications and suggestion for improved algorithms of F0 control in EL speech.by Yoko Saikachi.Ph.D

Florida Technological University, Course Descriptions, Bulletin Supplement, January 1974

FTU course descriptions, effective January 1974. This booklet supersedes the listing shown in the 1973-1974 bulletin

Bulletin 263 - 1966 Bulletin

https://thekeep.eiu.edu/eiu_bulletin/1095/thumbnail.jp