In this paper the sensitivity of the two-mass model with acoustical coupling to the model input-parameters is assessed. The model-output or the glottal volume air flow is characterised by signal-parameters in the time-domain. The influence of changing input-parameters on the signal-parameters is quantified.

Bond graphs are a domain-independent graphical description of dynamic behaviour of physical systems. This means that systems from different domains (cf. electrical, mechanical, hydraulical, acoustical, thermodymanical, material) are described in the same way. The basis is that bond graphs are based on energy and energy exchange. Analogies between domains are more than just equations being analo...

From an acoustical point of view, bone is a complex medium as it is heterogeneous, anisotropic and viscoelastic. This chapter reviews the basic notions of physical acoustics which are necessary to tackle the problem of the ultrasonic propagation in bone, in the perspective of the application of quantitative ultrasound (QUS) techniques to bone characterization. The first section introduces the b...

The acoustical properties of the vocal tract, the air-filled cavity between the vocal folds and the mouth opening, are determined by its individual geometry, the physical properties of the air and of its boundaries. In this article, we address the necessity of complex impedance boundary conditions at the mouth opening and at the border of the acoustical domain inside the human vocal tract. Usin...

Quantitative control of tissue processes in bioreactors is an open problem in tissue engineering, aimed at creating artificial tissues and organs. To standardize and optimize the process, it is necessary to control most of the parameters that may vary its effectiveness. We propose to monitor the changes that may suffer the matrix during the process using mechanical parameters. To ensure the via...

BACKGROUND Phonological disorder is one of the most frequent speech and language deficit observed in children and therefore studies using objective evaluation measurements should be developed and implemented during the diagnostic process. AIM To describe the acoustic characteristics of /l/ and /r/ liquid sounds. METHOD Speech production samples of 20 children with and without phonological d...

This work studies a Bayesian (or Maximum A Posteriori MAP) approach to the adaptation of Continuous Density Hidden Markov Models (CDHMMs) to a specific condition of a speech recognition application. In order to improve the model robustness, CDHMMs formerly trained from laboratory data are then adapted using context dependent field utterances. Two specific problems have to be faced when using th...

Starting with descriptions of rotational seismology, areas of interest and historical field measurements, the fundamental requirements for rotational seismometers for seismological and engineering application are formulated. On the above basis, a review of all existing rotational seismometers is presented with a description of the principles of their operation as well as possibilities to fulfil...

From a theoretical point of view it seems trivial to state that there exists a relation between perception of voice aspects and physically measurable parameters: what you can hear, you should be able to measure and vice versa: what you do measure, you should be able to hear. In practice this assumption is not supported by research: judgements based on auditory perception can be related to acous...

Ultrasonic velocity, viscosity and density of schiff base (E)–2-(2-nitrobenzylidene amino)benzoic acid and its metal complex of Fe(III) in DMSO have been measured at constant temperatures in the range of 306Kanddifferent concentration. This Schiff base was readily and conveniently accessible in high yields by green method. From the experimental data, the acoustical parameters such as adiabatic ...