Filter Banks
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Additional Constraints to Ensure Three Vanishing Moments for Orthonormal Wavelet Filter Banks and Transient Detection
Este artigo apresenta uma melhoria para a formulação de Sherlock e Monro para a parametrização wavelet para a obtenção das restrições que garantem três momentos nulos. A fim de testar a formulação apresentada, um exemplo de detecção de transitórios em sinais é apresentada.
TEMA (São Carlos). Publicado em: 2015-04
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2. Uma Proposta de Implementação de um Analisador de Harmônicos Variantes no Tempo
Neste trabalho, é realizada uma proposta de implementação de um analisador de harmônicos variantes no tempo para operação em tempo real, utilizando plataforma DSP TMS320F28027. O algoritmo utilizado para realização da decomposição harmônica é o da DFT de Janela Deslizante (Sliding-Window Recursive DFT). Este algoritmo é descrito completamente e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2011
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3. Análise da transformada wavelet direcional adaptativa na codificação de imagens
This work presents a method for the numerical stability analysis of adaptive lifting-based directional transforms. The goal is to investigate the relation between the directions set in the lifting scheme and the reconstruction quality of the corresponding bases. This new method is based on the variation in frequency of the condition number of the synthesis p
Publicado em: 2009
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4. Banco de filtros e wavelets sobre corpos finitos
Filter banks and wavelets are tools of Engineering, dened over complex elds, with many applications. This dissertation introduces the theory of lter banks and wavelets dened over nite elds, over cyclical and noncyclical structures. The problem of dening two-channel lter banks and wavelet decompositions over elds of characteristic two was solved, thereby prov
Publicado em: 2008
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5. Análise comparativa de wavelets para detecção de fenômenos oceanográficos relacionados à temperatura de superfície do mar em imagens adquiridas por satélite
The Remote Sensing arouses interest from general people, productive sector and research. Several fields can benefit of analytic and virtually omnipresent view of the satellites. When applied to oceanography, the advantages of remote sensing over traditional methods are as big as the oceans. With the possibility to acquire images of virtually anywhere over th
Publicado em: 2006
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6. Projeto de novos sistemas-wavelet com aplicaÃÃes na anÃlise de sinais do sistema elÃtrico / Design of new wavelet systems with applications in power system signal analysis
The wavelet transform equipped with the multiresolution analysis has been offered as an efficient tool in the investigation of non stationary signals derived from a plenty of areas. The development of new âbasisâ so as to implement such techniques has the aim of enlarging the span of suitable choices for a particular purpose. This thesis introduces new fam
Publicado em: 2006
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7. JOINT SOURCE/CHANNEL CODING USING LAPPED TRANSFORMS / CODIFICAÇÃO CONJUNTA FONTE/CANAL UTILIZANDO TRANSFORMADAS
Neste trabalho é feito um estudo sobre compressão de imagens para canal ruidoso.Inicialmente, esquemas de complexidade moderada sem a utilização do princípio da separação de Shannon são investigados e simulados. Com isso, mostra-se que esquemas eficientes de codificação conjunta fonte/canal existem e podem eventualmente apresentar melhor performanc
Publicado em: 2002
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8. Wavelet-based techniques for adaptive feature extraction and pattern recognition.
In this work, wavelet-based techniques are studxied for adaptive feature extraction in the time-frequency plane. Emphasis is placed on pattern recognition problems, in particular fault detection in control systems and classification / clustering electrocardiographic signals. In the context of fault detection, a technique for residue generation using wavelet
Publicado em: 1999
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9. STUDY ON SPEECH CODING IN SUB-BANDS AT 16 KBITS/S / ESTUDO DE CODIFICAÇÃO DE VOZ EM SUB-BANDAS A 16 KBIT/S
In this thesis a study of 16 kbit/s sub-band coding of speech signals is presented. The encoding systems are examined in terms of the number of sub-bands, the schemes used to encode the sub-band signals, the parameters and techniques employed in the quantizers adaptation and the type of bit allocation. Spectral decomposition of the input signal is carried ou
Publicado em: 1986
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10. An automated multiplex oligonucleotide synthesizer: development of high-throughput, low-cost DNA synthesis.
An automated oligonucleotide synthesizer has been developed that can simultaneously and rapidly synthesize up to 96 different oligonucleotides in a 96-well microtiter format using phosphoramidite synthesis chemistry. A modified 96-well plate is positioned under reagent valve banks, and appropriate reagents are delivered into individual wells containing the g
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11. Intergeneric Transfer of Conjugative and Mobilizable Plasmids Harbored by Escherichia coli in the Gut of the Soil Microarthropod Folsomia candida (Collembola)
The gut of the soil microarthropod Folsomia candida provides a habitat for a high density of bacterial cells (T. Thimm, A. Hoffmann, H. Borkott, J. C. Munch, and C. C. Tebbe, Appl. Environ. Microbiol. 64:2660–2669, 1998). We investigated whether these gut bacteria act as recipients for plasmids from Escherichia coli. Filter mating with E. coli donor cells
American Society for Microbiology.