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Littlewood-Paley sets and sums of permuted lacunary sequencesTrudeau, Sidney. January 2009 (has links)
No description available.
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192 |
Convergence results on Fourier series in one variable on the unit circleFerns, Ryan. January 2007 (has links)
No description available.
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193 |
Development of an OpenFOAM Solver for Hydroacoustic Simulations: An Application for Acoustic Fish DeterrenceGeorge, Edwin Subin 07 March 2024 (has links)
Master of Science / This project aims to develop computational tools for analyzing an underwater acoustic system designed to deter invasive fish species in the Mississippi River Basin. It leverages an established numerical framework (OpenFOAM) and deals with understanding how to model the system. The study prioritizes enhancing the accuracy of the methods developed and ways to improve its computational efficiency.
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Spectral analysis of GEOS-3 altimeter data and frequency domain collocation /Eren, Kamil January 1980 (has links)
No description available.
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Bounded functions with no spectral gaps /Bieberich, Richard Allen January 1973 (has links)
No description available.
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196 |
Measurement of the optical contraints of sapphire and quartz in the far infrared with the asymmetric Fourier transform method /Russell, Edgar Ernest January 1966 (has links)
No description available.
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Decodificação de Sinais DTMF Via Transformada Aritmética de FourierLIMA, Juliano Bandeira January 2004 (has links)
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Previous issue date: 2004 / A sinalização DTMF (Dual-Tone Multifrequency) tem diversas aplicações importantes,
sendo usada em muitos sistemas de Telecomunicações, tais como telefonia a teclado, correio
de voz, comércio eletrônico e sistemas bancários interativos. Com a demanda crescente por
taxas de transmissão cada vez mais elevadas nesse contexto, a velocidade de decodificação
dos sinais DTMF torna-se um parâmetro importante no projeto desses sistemas. Uma vez que
a decodificação é realizada via multiplexação temporal em um processador digital de sinais,
um menor tempo de decodificação implica capacidade de processar simultaneamente um
maior número de canais. Esta dissertação propõe um novo método, baseado na Transformada
Aritmética de Fourier, para a decodificação dos sinais DTMF. O método proposto é mais
eficiente, em termos de complexidade computacional, do que as técnicas usualmente
utilizadas nesse cenário. São enfatizadas as vantagens computacionais que esta nova técnica
oferece sobre outros algoritmos que calculam a Transformada Discreta de Fourier. Resultados
de simulações são apresentados e algumas implementações são sugeridas. Uma breve análise
do desempenho do método proposto, na presença de quantizadores, é feita
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198 |
Automated Parameter Tuning based on RMS Errors for nonequispaced FFTsNestler, Franziska 16 February 2015 (has links) (PDF)
In this paper we study the error behavior of the well known fast Fourier transform for nonequispaced data (NFFT) with respect to the L2-norm. We compare the arising errors for different window functions and show that the accuracy of the algorithm can be significantly improved by modifying the shape of the window function. Based on the considered error estimates for different window functions we are able to state an easy and efficient method to tune the involved parameters automatically. The numerical examples show that the optimal parameters depend on the given Fourier coefficients, which are assumed not to be of a random structure or roughly of the same magnitude but rather subject to a certain decrease.
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Deterministic Sparse FFT AlgorithmsWannenwetsch, Katrin Ulrike 09 August 2016 (has links)
No description available.
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200 |
Aspects of Fourier imagingHsiao, Wen-Hsin January 2008 (has links)
A number of topics related to Fourier imaging are investigated. Relationships between the magnitude of errors in the amplitude and phase of the Fourier transform of images and the mean square error in reconstructed images are derived. The differing effects of amplitude and phase errors are evaluated, and "equivalent" amplitude and phase errors are derived. A model of the probability density function of the Fourier amplitudes of images is derived. The fundamental basis of phase dominance is studied and quantitated. Inconsistencies in published counter-examples of phase dominance are highlighted. The key characteristics of natural images that lead to their observed power spectral behaviour with spatial frequency are determined.
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