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This paper deals with the problem of computing a best rational L 2 approximation of specified order to a given multivariable transfer function. The problem is equivalently formulated as a minimization problem over the manifold of lossless transfer functions of fixed order. To describe this manifold, we use some Schur parameters which allows for a(More)
— This paper presents an analog implementation of the complex wavelet transform using both the complex first order system (CFOS) and the Padé approximation. The complex wavelet filter design is based on the combination of the real and the imaginary state-space descriptions that implement the respective transfer functions. In other words, a complex filter is(More)
The problem of finding the global minimum of a so-called Minkowski-norm dominated polynomial can be approached by the matrix method of Stetter-Möller, which reformulates it as a large eigenvalue problem. A drawback of this approach is that the matrix involved is usually very large. However, all that is needed for modern iterative eigenproblem solvers (such(More)
In this paper, the connections are investigated between two diierent approaches towards the parametrization of multivariable stable all-pass systems in discrete-time. The rst approach involves the tangential Schur algorithm, which employs linear fractional transformations. It stems from the theory of reproducing kernel Hilbert spaces and enables the direct(More)
Beat-to-beat variability of repolarization duration (BVR) is an intrinsic characteristic of cardiac function and a better marker of proarrhythmia than repolarization prolongation alone. The ionic mechanisms underlying baseline BVR in physiological conditions, its rate dependence, and the factors contributing to increased BVR in pathologies remain(More)
—Signal processing by means of analog circuits offers advantages from a power consumption viewpoint. A method is described to implement wavelets in analog circuits by fitting the impulse response of a linear system to the time-reversed wavelet function. The fitting is performed using local search involving an 2 criterion, starting from a deterministic(More)
research at the mobile telecommunication company Vodafone Netherlands at Maastricht. The main aim of this research was to gain more insight into survival analysis and its application as a predictive model. I considered translating theoretical knowledge to a real life context both challenging as well as very appealing. First, I would like to thank my(More)