49 research outputs found
Toepassing van een pseudo-matched filtermodel op het transiënte kanaal van de menselijke visuele waarneming
No full textLaguerre-domain adaptive filters
No full textUsing a tapped-delay-line as an adaptive fitter, the complexity of the filter increases with increasing correlation length of input and reference signal. The author seeks simple adaptive filter structures such that for a long correlation length only a minor complexity of the filter is needed. He considers adaptive mechanisms governed by an exponentially weighted squared-error criterion. Laguerre-domain adaptive filters are introduced, which lead to a tapped IIR-filter line. These filters contain a discount factor as a free variable, which makes it possible to set the memory and the number of adaptive coefficients independently. Convergence properties of the proposed adaptive filters are discusse
Unification of three linear models for the transient visual system
No full textThree different linear filters are considered as a model describing the experimentally
determined triphasic impulse responses of discs. These impulse responses arc associated
with the transient visual system. Each model reveals a different feature of the system.
Unification of the models is proposed. The resulting model exhibits all the features of
the original models
Een incoherent polychromatisch beeldbewerkingssysteem op basis van achromatische Fouriertransformatoren
No full textLinear and quadrature models for data from treshold measurements of the transient visual system
No full textIII this paper two models are considered for the transient visual system at
threshold. One is a linear model and the other a model contain ing a quadrature
element. Both models are commonly used on evidence from different experimental
sources. It is shown that both models act in a similar fashion for the
experiments using a perturbation technique as is the case at IPO. It is however
possible to distinguish between these models in an experiment with a. perturbation
technique using a statistical test. This test is discussed and pe.rformed
and it is shown that it supports the linear and rejects the quadrature modeJ
Optimality conditions for a specific class of Kautz series
No full textKautz functions constitute a basis in L2 and can be used for filter synthesis starting from a prescribed transient response. In a practical situation, only truncated series are used and thus the speed of convergence of such series is of importance. This convergence speed is a function of the parameters. The Kautz functions that are considered can be generated by a line of identical Nth-order allpass sections. The optimality conditions for the parameters of this specific class of truncated Kautz series are established solely on the basis of the orthonormality and the polynomial character of the basis function
MODEL REDUCTION BY KAUTZ FILTERS
No full textPublication in the conference proceedings of EUSIPCO, Trieste, Italy, 199
