This paper presents an Internal Model Control (IMC) structure designed for a class of continuous linear underactuated systems. The study treats the case of Minimum Phase (MP) systems and those whose zero dynamics are not necessarily stable. The proposed IMC structure is based on a specific controller which is obtained by the realization of an approximate inverse of the model plant. It is shown ...

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...

1 Laboratory for Atmospheric Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland 2 Leibniz-Institute for Tropospheric Research, 04318 Leipzig, Germany 3 School of Earth, Atmospheric and Environmental Sciences, University of Manchester, M60 1QD, UK 4 Institute for Atmospheric Physics, German Aerospace Centre, 82234 Wessling, Germany * now at: Institute for Atmospheric and Climate S...

Cluditem is a routing algorithm for wireless sensor networks developed for applications of environmental monitoring with periodic measurement of variables. These applications tolerate a maximum phase shift of the clocks of nodes in the order of milliseconds. This paper proposes two centralized synchronization schemes that introduce a limited processing load. The objective of the work was to ass...

A new technique for ascertaining the thermodynamic cloud phase from high-spectral-resolution ground-based infrared measurements made by the Atmospheric Emitted Radiance Interferometer (AERI) is presented. This technique takes advantage of the differences in the index of refraction of ice and water between 11 and 19 mm. The differences in the refractive indices translate into differences in clou...

Approximate Dynamic Inversion has been established as a method to control minimum-phase, nonaffine-incontrol systems [1]. In this report, we re-state the main results of [1], clarify some minor notational errors, and prove the same results in an expanded form. In the large, the main results of [1] still stand. The development follows [1] closely, and no novelty is claimed herein. The purpose of...

—Source of speech signal consists of voiced part and unvoiced part. In conventional source-filter model, those two sources are considered to be independent. But in real situation it is difficult to segregate the source into voiced and unvoiced part. Actual source consists of mixture of two sources and the ratio varies according to the contents or intention of the speaker. In this paper we tried...

Current engineering practice for adaptive control schemes is to base the design on globally convergent schemes for simple plant models, An important class of such schemes uses least squares estimation of assumed simple input–output models and constructs the controller using the parameter estimates. This paper studies the robustness of such schemes to the presence of unmodelled plant colourcd no...