A geometric method for the design of a minimal-order dynamic feedforward compensator cancelling the minimum-phase invariant zeros of a linear multivariable system, while preserving the properties of controllability, observability, and right invertibility is discussed. The method is illustrated for continuous-time, non-strictly proper systems. Nonetheless, it also applies to strictly-proper syst...

This paper studies the use of glottal inverse filtering together with a biomechanical model of the vocal folds to simulate the glottal flow waveform. The glottal flow waveform is first estimated by inverse filtering the acoustic speech pressure signal of natural speech. The estimated glottal flow is used as a template in an optimization process which searches for a set of parameters for a deter...

Estimation of the source of voiced speech, the glottal volume velocity waveform, with inverse filtering involves usually a parameterisation stage, where the obtained flow waveforms are expressed in numerical forms. This stage of the voice source analysis, the parameterisation of the glottal flow, is discussed in the present paper. The paper aims to give a review on the different methods develop...

This study investigates the contribution of voice quality to the expression of “positive politeness” under varying conditions of relative social status between male speakers of Japanese. In previous studies, suprasegmental features have been found to express politeness. Bandwidth of the first formant (BW1) was also found to be relevant to perceived politeness. However, the association between B...

In this work we consider the problem of output regulation for linear single input-single output systems in presence of time-varying measurement constraint. It is shown how an internal model-based regulator, processing a saturated uncertain function of the regulated error, can be designed in order to secure asymptotic tracking/rejection of exosystemgenerated references/disturbances. The design i...

We consider waveguides formed by single or multiple two-dimensional chaotic cavities connected to leads. The cavities are chaotic in the sense that the ray (or equivalently, classical particle) dynamics within them is chaotic. Geometrical parameters are chosen to produce a mixed phase space (chaotic regions surrounding islands of stability where motion is regular). Incoming rays (or particles) ...

Neurological degenerative diseases are becoming a growing concern in modern society. The successful treatment of these diseases depend greatly in early detection. Speech has been routinely used by specialists as a valuable correlate in the assessment of pathological disease. Specifically voicing can serve as a very introspective correlate for this practice. The present paper uses a methodology ...

It is well-known that different speakers utilize their vocal instruments in diverse ways to express linguistic intention with some paralinguistic coloring such as emotional quality. The study of voice source features, which describe the action of the vocal folds, is important for a deeper understanding of emotion encoding in speech. In this study we investigate inter and intra-speaker differenc...

Glottal inverse filtering is a technique used to derive the glottal waveform during voiced speech. Closed phase inverse filtering (CPIF) is a common approach for achieving this goal. During the closed phase there is no input to the vocal tract and hence the impulse response of the vocal tract can be determined through linear prediction. However, a number of problems are known to exist with the ...

In this paper we study tracking performance limitation problems. Two issues are addressed, concerning how earlier results developed elsewhere may be extended to more general classes of reference signals, and how tracking performance may be further improved beyond that o ered by feedback control. Toward these issues we consider exponentially increasing reference inputs and examine the use of pre...