Multicomponent data usually are not processed with specifically designed procedures but with procedures analogous to those used for single-component data. In isotropic media, the vertical and horizontal components of the data commonly are taken as proxies for the Pand S-wave modes, which are imaged independently with the acoustic wave equations. This procedure works only if the vertical and hor...

The structural-acoustic optimization shows high potential in minimization of radiated noise especially for thin shell geometries. Acoustic design sensitivity analysis can provide information on how the geometry change affects the acoustic performance of the given structure, so it is an important step of the acoustic design and optimization processes. But the sensitivity analysis of the structur...

We derive boundary conditions for the phase space energy density of acoustic waves in a half space, in the high frequency limit. These boundary conditions generalize the usual re ection-transmission relations for plane waves and are well suited for the study of wave propagation in bounded random media in the radiative transport approximation [15]. The high frequency analysis is based on direct ...

This study examines the phonetic characteristics of primary versus secondary stress on the first syllables of the surname ‘Wheateron’ and related adjective ‘Wheateresque’ in postnuclear, deaccented position in a dialogue produced 40 times by 3 Australian English talkers. Synchronised acoustic, electromagnetometer, and electropalatographic recordings were analysed. One subject had a higher F0 in...

This study of lexical stress in English is part of a series of studies, the goal of which is to describe the acoustics of lexical stress for a number of typologically different languages. When fully developed the methodology should be applicable to any language. The database of recordings so far includes Brazilian Portuguese, English (U.K.), Estonian, German, French, Italian and Swedish. The ac...

1 In this report, we construct numerical algorithms for the solution of inverse scattering problems in layered acoustic media. Our inverse scattering schemes are based on a collection of so-called trace formulae, and can be viewed as extension of the work started in [3]. The speed c of propagation of sound, the density ρ, and the attenuation γ are the three parameters reconstructed by the algor...

Over the past several decades, many acoustic markers have been proposed to be sensitive to and measure overall voice quality. This meta-analysis presents a retrospective appraisal of scientific reports, which evaluated the relation between perceived overall voice quality and several acoustic-phonetic correlates. Twenty-five studies met the inclusion criteria and were evaluated using meta-analyt...

In 1930 Sergey L. Sobolev [6, 7] has proposed a construction of the solution of the Cauchy problem for the hyperbolic equation of the second order with variable coeffi cients in 3-d. Although Sobolev did not construct the fundamental solution, his construction was modified in 1986 by Romanov [4] to obtain that solution. However, these works impose a restrictive assumption of the regularity of g...

BACKGROUND Acoustic analysis had been well incorporated into clinical evaluation and management of children with speech disorders for many years. The aim of this study is to investigate developmental changes in vowel production in Mandarin-speaking children using acoustic study analysis. METHODS A total of 22 children from 5-12 years old were analyzed in this study. Each child read a list of ...

Acoustic methods have progressed to the point that an acoustic typology of the motor speech disorders can be constructed from a parameteric assessment of the speech subsystems (e.g., phonation, nasal resonance, vowel articulation, consonant articulation, intonation, and rhythm). The results of this analysis can be interpreted in respect to global functions in speech (e.g., voice quality, intell...