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Noise Signals (noise + signal)

Distribution by Scientific Domains

Engineering	66%

Selected Abstracts

Circuits, computers, and beyond Boolean logic,

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 5-6 2007
Tamás Roska
Abstract Historically, the invention of the stored programmable computer architecture, introduced by John Von Neumann, was also influenced by electrical circuit implementation aspects, as well as tied to fundamental insight of logic reasoning. It can also be considered as a mind-inspired machine. Since then, the implementation of logic gates, control and memories has developed independently of the architecture. The Cellular Wave Computer architecture (IEEE Trans. Circuits Syst. II 1993; 40:163,173; Electron. Lett. 2007; 43:427,449; J. Circuits Syst. Comput. 2003; 5(2):539,562) as a spatial,temporal universal machine on flows has also been influenced by circuit aspects of very large-scale integration (VLSI) technology, as well as some motivating living neural circuits, via the cellular nonlinear (neural) network (CNN). It might be considered as a brain-inspired machine. In this paper, after summarizing the main properties of the Cellular Wave Computer, we highlight a few basic properties of this new kind of computer and computing. In particular, phenomena related to (i) the one-pass solution of a set of implicit equations due to real-time spatial array feedback, (ii) the true random signal array generation via the insertion of the continuous physical noise signals, (iii) the finite synchrony radius due to the functional delay of wires, as well as to (iv) biology relevance. We also show that the Cellular Wave Computer is performing spatial,temporal inference that goes beyond Boolean logic, a characteristic of living neural circuits. Copyright © 2007 John Wiley & Sons, Ltd. [source]

,, filtering for discrete-time linear systems with Markovian jumping parameters,,

INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 14 2003
Carlos E. de Souza
Abstract This paper investigates the problem of ,, filtering for discrete-time linear systems with Markovian jumping parameters. It is assumed that the jumping parameter is available. This paper develops necessary and sufficient conditions for designing a discrete-time Markovian jump linear filter which ensures a prescribed bound on the ,2 -induced gain from the noise signals to the estimation error. The proposed filter design is given in terms of linear matrix inequalities. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Mixed H,/H2 design of digital phase-locked loops with polytopic-type uncertainties

INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 14 2002
V. Suplin
Abstract A robust H, control method is applied to the design of loop filters for digital phase locked loop carrier phase tracking. The proposed method successfully copes with large S -curve slope uncertainty and with a significant decision delay in the closed-loop that may stem from the decoder and/or the equalizer there. The design problem is transformed into a state-feedback control problem where phase and gain-margins should be guaranteed in spite of the uncertainty. Of all the loop filters that achieve the required margins the one that minimizes an upper-bound on the effect of the phase and the measurement noise signals is derived. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Robust ,, filtering for uncertain Markovian jump linear systems,

INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 5 2002
Carlos E. de Souza
Abstract This paper investigates the problem of ,, filtering for a class of uncertain Markovian jump linear systems. The uncertainty is assumed to be norm-bounded and appears in all the matrices of the system state-space model, including the coefficient matrices of the noise signals. It is also assumed that the jumping parameter is available. We develop a methodology for designing a Markovian jump linear filter that ensures a prescribed bound on the ,2 -induced gain from the noise signals to the estimation error, irrespective of the uncertainty. The proposed design is given in terms of linear matrix inequalities. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Use of the wavelet method for analyzing electrochemical noise data

MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 12 2007
O. Duran
This research paper shows the application of the mathematical tool "wavelet's" to be used in the interpretation and analysis of electrochemical noise signals. The Fast Fourier Transformation (FFT) is one of the most commonly used techniques for analyzing electrochemical noise. But the application of this methodology to the analysis of stochastic signals does not allow their interpretation in a suitable way. The wavelet's methodology carries out the analysis by means of the construction of finite base functions. In several studies, it has been found out that the function that is closest to the electrochemical oscillations is the one called "coiflets," which presents a similar geometry to what it is observed when an ionic,electronic interchange occurs during an electrochemical interphase. The analysis that appears here was implemented using the toolbox "LabViewÔ." [source]

Online monitoring of crevice corrosion with electrochemical noise

MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 10 2004
G. Schmitt
Abstract The time-related cumulated noise charges extracted from the noise signals between two "identical" crevice electrodes yield a direct quantitative easy-to-interpret information on time-related corrosion intensities in the crevice. A new software-assisted method of noise data evaluation allows a "counting of coulombs" exchanged between the system electrodes, the results of which directly correlate with the metal dissolution intensity in the crevice. The versatility of this "CoulCount" method is demonstrated in a failure analysis on the cause of crevice corrosion at spigots of automotive cooling water pumps. Echzeitüberwachung von Spaltkorrosion durch Elektrochemisches Rauschen Zeitbezogene Gesamtrauschladungsmengen, welche aus den Rauschsignalen zwischen zwei "identischen" Spalteleltroden gewonnen werden können, liefern einfach zu interpretierende Informationen über die zeitbezogene Korrosionsintensität im Spalt. Eine neue, Software-unterstützte Methode der Rauschdatenauswertung erlaubt das Zählen der Ladungen, die zwischen den Systemelektroden ausgetauscht werden. Das Ergebnis korreliert direkt mit der Metallauflösungsintensität im Spalt. Die vielseitige Anwendbarkeit dieser "CoulCount-Methode" wird am Beispiel einer Schadensanalyse zur Ursache der Spaltkorrosion an Stutzen von Automobilwasserpumpen demonstriert. [source]