We present a study of the acoustic source parameters describing glottal flow waveforms generated by the two-mass model for vocal fold oscillations. Numerical measurements of the acoustic parameters as a function of model parameters are presented. Conclusions are drawn from these results, concerning the correlations between acoustic parameters, the effect of the vocal tract, the different regime...

Original scientific paper Analysis of heat source shape is important for comprehending Submerged Arc Welding Process. Here an attempt is made to investigate into the analytical solution of the thermal field related to a high deposition rate based process like SAW. It is assumed that a moving heat source follows Gaussian distribution. The realistic assumptions of the shape parameters are made to...

One of the methods used to investigate the damaged zone in rock structure is the acoustic emission method. This method is based on receiving the elastic waves that are produced by deformation and cracking of the rock mass around the underground excavation. In this research, a study is conducted on the rock samples by a numerical method to investigate the damaged zone caused by the excavat...

In the following, we will consider two cylindrical waveguides separated by a device under test (DUT) of thickness s, the scattering parameters of which will be assessed. A loudspeaker is used to generate sound in the first (incident) waveguide, the second waveguide being closed with an anechoic termination, and four microphones are placed at locations xi at both sides of the interface to measur...

A theoretical study analyzing three-dimensional combustion acoustic instabilities in a liquid propellant rocket engine combustor has been conducted. A linear theory based on Crocco’s pressure sensitive time lag model is used. To apply this theory the combustor is divided into two main components, including the combustion chamber and the converging part of the nozzle. The assumption of concentra...

This paper reports an attempt to map the time variations of selected articulatory parameters (from X-ray profiles) directly on the F1, F2 and F3 formant tracks using multiple regression analysis (MRA). The results indicate that MRA can indeed be useful for predicting formant frequencies. Since the results reported here are limited to preliminary observations of F1 only, further studies includin...

The acoustics of isolated vowels, e.g. of /a/, have in many studies been linked to pathological voice types, such as tracheoesophageal (TE) voice. To study the possibilities of objective and automatic classification of pathological TE voice types, the acoustic features of /a/ were quantified and subsequently classified using a suit of machine learning technologies. Best classification was achie...

By mapping acoustic parameters onto phonetic features, it is possible to explicitly address the linguistic information in the signal. For the experiments presented in this paper, we mapped cepstral parameters onto two sets of phonetic features, one based on the IPA chart and the other on SPE. As a result, the phoneme identification rates in a hidden Markov modelling framework increase from 15.6...

This article focuses on methodological issues related to quantitative assessments of speech quality after glossectomy. Acoustic and articulatory data were collected for 8 consonants from two patients. The acoustic analysis is based on spectral moments and the Klatt VOT. Lingual movements are recorded with ultrasound without calibration. The variations of acoustic and articulatory parameters acr...