Sound waves are mechanical waves and the behaviours of fixtures inside rooms are governed by rules in physics. These fixtures are classified into three groups: reflectors, diffusers and absorbers, and the physical properties are investigated. The important parameters in determining acoustic quality of rooms are introduced. On the other hand, it is shown that limitations exist on applying these ...

Estimation of speaker’s height and vocal tract length (VTL) from speech signal can have forensic and automatic speech recognition applications. It was suggested for a long time that there is a correlation between speaker’s VTL, on one side, and speaker’s height and formant frequencies, on another side. Until recently, these putative relationships have been empirically examined in studies employ...

The present study shows the relationship between welding quality and optical-acoustic emissions from electric arcs, during welding runs, in the GMAW-S process. Bead on plate welding tests was carried out with pre-set parameters chosen from manufacturing standards. During the welding runs interferences were induced on the welding path using paint, grease or gas faults. In each welding run arc vo...

In this paper, we propose a consonant class discrimination (CCD) method in dysarthric speech, where a support vector machine (SVM) is employed by using class-dependent acoustic parameters. To this end, each consonant is categorized into one of five classes according to the manner of articulation such as stop, affricate, fricative, nasal and glide. In the proposed CCD method using SVM, acoustic ...

A nonlinear acoustic effect is a sensitive tool to detect a micro-scale crack or early stage of cracking during the fatigue process. The damage produces a nonlinear stress-strain relationship, and the nonlinearity can be measured by a higher harmonic component in the frequency domain. The greater the damage, the larger the level of a nonlinearity, which can be used for the diagnosis of micro-cr...

This work aims at examining three classes of acoustic correlates of lexical stress in Brazilian Portuguese (BP) in three speaking styles: informal interview, phrase reading and word list reading. In the framework of an international collaboration, a parallel corpus was recorded in the three speaking styles with 10 subjects so far in each one of the following languages: Swedish, English, French,...

OBJECTIVE To evaluate the voice quality of patients with idiopathic Parkinson's disease, at the "on" and "off" moments of the disease. METHOD Five individuals with Parkinson's disease and five of the control group were assessed. All of them underwent the recording of voice and speech. The acoustic parameters analyzed were: fundamental frequency, jitter, shimmer, harmonic noise proportion and ...

Our work deals with the classical problem of merging heterogenous and asynchronous parameters. It's well known that lips reading improves the speech recognition score, specially in noise condition ; so we study more precisely the modeling of acoustic and labial parameters to propose two Automatic Speech Recognition Systems : a Direct Identi cation is performed by using a classical HMM approach ...