The object of the presentation is a polynomial waveshaping model of the phonatory excitation signal. The phonatory excitation signal is the acoustic signal that is generated at the glottis via the vibrating vocal folds and the pulsatile airflow. A waveshaper is an operator that transforms a sinusoid into any desired waveform. The waveshaper is approximated by means of a pair of polynomials whos...

We conducted quantitative analyses of a magnetic resonance imaging (MRI) database to examine the correlation between physical measures (vocal tract length and body height) and acoustic parameters (pitch and formant frequencies) of vowels. The vocal tract length was measured from MRI data for the five Japanese vowels produced by fifteen male Japanese speakers between the ages of 24 and 55. The a...

Coupling coefficients for thin shells of arbitrary curvature based upon a ray-theoretic approach devised by the authors are benchmarked against exact and high-frequency results for canonical geometries, i.e., the spherical nd infinite circular cylindrical shells. The well-known high-frequency approximations of the coupling coefficients are found to describe their magnitude accurately but not th...

The purpose of this study is to investigate the acoustic performance of mufflers. As a numerical scheme for analyzing an acoustic filter, the boundary element method is more suitable than are domain methods, such as the finite element method, which has to mesh the domain. However, the coefficient matrices established by the boundary element method are full and often non-symmetrical. In order to...

Abstract: This contribution presents a new approach for analysing spatial directions in room impulse responses captured with source and receiver of adjustable directivity. A distinct peak in a room impulse response is usually associated with an acoustic path length of direct or reflected sound. Given the ability to modify the directivity of source and receiver by spherical beamforming, beam coe...

In this paper we consider the problem of determining the boundary perturbations of an object from far-field electric or acoustic measurements. Assuming that the unknown scatterer boundary is a small perturbation of a circle, we develop a linearized relation between the far-field data and the shape of the object. This relation is used to find the Fourier coefficients of the perturbation of the s...

In this paper, an audio-book, in which a professional voice talent performs multiple characters, is exploited to investigate the expressiveness of speech. The expressive speech space of the sole speaker is explored by finding the distances between acoustic models of multiple characters and the perceived proximity between their speech utterances. Using the speech of ten characters as test data, ...

The waveguide invariant is usually not extracted from the striation pattern of broadband continuous spectrum in low frequency analysis and recording at signal-to-noise ratio. In this paper, correlation coefficient multi-tonal acoustic intensity interference fluctuation utilized to estimate invariant. Since proportional relationship between reference scaled dependent on invariant, estimation can...

with the aim of identifying failure mechanism in oriented strand boards, failure behavior of wood strands under tensile load was investigated using acoustic emission technique. resinated and unresinated strands were arranged at top, middle and bottom section of the board before pressing. tensile and acoustic emission tests were performed simultaneously on treated and control samples. using tens...