Search results for "Walsh"
showing 10 items of 13 documents
Multiple-Output Walsh Function Generation for Minimum Orthogonality Error
1978
A hazard-free multiple-output Walsh function generator is presented which requires a minimum amount of hardware and is as fast as the integrated logic family employed for the implementation. However, the main characteristic of the instrument is the optimum performance from the viewpoint of the orthogonality of the function generated, as it is shown by the experimental verifications reported.
Multidimensional P-adic Integrals in some Problems of Harmonic Analysis
2017
The paper is a survey of results related to the problem of recovering the coefficients of some classical orthogonal series from their sums by generalized Fourier formulas. The method is based on reducing the coefficient problem to the one of recovering a function from its derivative with respect to an appropriate derivation basis. In the case of the multiple Vilenkin system the problem is solved by using a multidimensional P-adic integral.
W.H. Walsh’s Idea of Colligation Reconsidered
2020
Essay on: W.H. Walsh´s Idea of Colligation Reconsidered
Multidimensional dyadic Kurzweil–Henstock- and Perron-type integrals in the theory of Haar and Walsh series
2015
Abstract The problem of recovering the coefficients of rectangular convergent multiple Haar and Walsh series from their sums, by generalized Fourier formulas, is reduced to the one of recovering a function (the primitive) from its derivative with respect to the appropriate derivation basis. Multidimensional dyadic Kurzweil–Henstock- and Perron-type integrals are compared and it is shown that a Perron-type integral, defined by major and minor functions having a special continuity property, solves the coefficients problem for series which are convergent everywhere outside some uniqueness sets.
Rodolfo Walsh en 'ese hombre': un escritor a diario, su memoria en los papeles
2013
Resumen: Este articulo integra dos tipos de lectura critica de Ese hombre y otros papeles personales (Buenos Aires, 1996 y 2007), de Rodolfo Walsh, con edicion a cargo de Daniel Link. Considerando, primero, el diario del escritor que incluye, el libro describe, dentro del pathos caracteristico del genero, las imposibilidades y los fracasos de la escritura, que especifican historicamente los problemas de la relacion entre literatura y politica, propios del campo argentino de los anos ’60-’70. Las tensiones de la escritura y la vida, agudizadas cuando apremia la militancia, y expresadas en las disyuntivas de genero –basicamente, novela vs. testimonio- constituyen, en esa linea, un eje crucia…
Improved Switching Strategy for Selective Harmonic Elimination in DC-AC Signal Generation via Pulse-Width Modulation
2013
Published version of an article in the journal: Abstract and Applied Analysis. Also available from the publisher at: http://dx.doi.org/10.1155/2013/870904 Open Access We present an advanced design methodology for pulse-width-modulated (PWM) DC-AC signal generation. Using design methods based on the Walsh transform, AC sinusoidal signals can be approximated by suitable PWM signals. For different AC amplitudes, the switching instants of the PWM signals can be efficiently computed by using appropriate systems of explicit linear equations. However, the equation systems provided by conventional implementations of this approach are typically only valid for a restricted interval of AC amplitudes a…
Spatial coherence properties of a multiple aperture system an analysis based on the Walsh functions
1997
Analysis of the spatial coherence of the light transmitted by an optical device composed of a periodical array of identical apertures is developed by employing an approach based on the properties of the binary Walsh functions. The successive interactions between each aperture, and the mutual intensity characterizing the coherence state of the transmitted light, can be adequately explained through the behaviour of the Walsh-Hadamard spectrum associated with the intensity distribution resulting from the far-field propagated light at the output of the aperture array.
Testimonial writing in Rodolfo Walsh and Francisco Urondo: political-aesthetical experiences in revolutionary times
2016
Este trabajo se ocupa de las trayectorias políticas e intelectuales de Rodolfo Walsh y Francisco Urondo desde una perspectiva que atiende a mostrar y analizar los singulares puntos de contacto entre sus recorridos en lo que respecta a una cuestión central en las polémicas culturales de los años sesenta y setenta en América Latina: las búsquedas tendientes a subvertir los modos de concebir las relaciones entre arte, política y sociedad.La investigación focaliza en los posicionamientos estético-políticos de Walsh y Urondo en un momento considerado como un clivaje dentro de la historia intectual argentina: los finales de la década del sesenta. Se abordan los entrecruzamientos de sus proyectos …
Analysis of singular bilinear systems using Walsh functions
1991
The use of Walsh functions to analyse singular bilinear systems is investigated. It is shown that the nonlinear implicit differential system equation may be converted to a set of linear algebraic Lyapunov equations to be solved iteratively for the coefficients of the semistate x(t) in terms of the Walsh basis functions. Solution of the iterative algorithm is uniformly convergent to the exact solution of the algebraic generalised Lyapunov equation of the singular bilinear system. The present method is slightly more complicated than a similar one arising from the analysis of linear singular systems. In fact, it is a hybrid between the analyses of usual linear singular and bilinear regular sys…
Multiple-plane image formation by Walsh zone plates.
2018
[EN] A radial Walsh filter is a phase binary diffractive optical element characterized by a set of concentric rings that take the phase values 0 or ¿, corresponding to the values + 1 or ¿1 of a given radial Walsh function. Therefore, a Walsh filter can be re-interpreted as an aperiodic multifocal zone plate, capable to produce images of multiple planes simultaneously in a single output plane of an image forming system. In this paper, we experimentally demonstrate for the first time the focusing capabilities of these structures. Additionally, we report the first achievement of images of multiple-plane objects in a single image plane with these aperiodic diffractive lenses.