Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Filter banks"”.
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Hybrid filter banks for analog/digital conversion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Wavelets and filter banks: New results and applications
… done efficiently with multirate systems known as filter banks. This thesis develops a comprehensive set of tools for (multidimensional) multirate signal analysis and uses them to investigate two multirate systems: filter banks and transmultiplexers. Several results in filter bank theory are …
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Perfect Reconstruction Filter Banks for Adaptive Filtering and Coding
… considers the design of perfect reconstruction filter banks (PRFBs) for adaptive filtering and coding applications. The first half of this thesis derives a generalization to the Transform Domain Adaptive Filter (TDAF), which uses filter banks instead of unitary transforms to preprocess input …
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Wavelets and multirate filter banks : theory, structure, design, and applications
Wavelets and filter banks have revolutionized signal processing with their ability to process data at multiple temporal and spatial resolutions. Fundamentally, continuous-time wavelets are governed by discrete-time filter banks with properties such as perfect reconstruction, linear phase and …
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Audio denoising using wavelet filter banks aimed at real-time application
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Towards optimisation of digital filters and multirate filter banks through genetic algorithms
… the issues of design and optimisation of digital filters and multirate filter banks. The main focus and contribution of this thesis is to apply the genetic algorithm (GA) technique and to draw some comparison with the standard gradient and non-gradient based optimisation methods. The finite word …
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Wavelet-like filter banks for multi-dimensional and multi-resolution signal processing
… detail, particularly their relationship to the filter bank. The investigations on the properties of the wavelet revealed that the advantages of the wavelet filter banks over the conventional perfect reconstruction filter banks lie in the extra constraints imposed on the wavelet filter banks, and …
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*Multidimensional Multirate Systems: Characterization, Design, and Applications
… multirate systems are multidimensional filter banks, including critically sampled and oversampled ones. Characterizing and designing multidimensional perfect reconstruction filter banks have been challenging tasks. For critically sampled filter banks, previous one-dimensional theory …
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Global Search Methods for Solving Nonlinear Optimization Problems
… networks, (b) the design of quadrature-mirror-filter digital filter banks, (c) the satisfiability problem, (d) the maximum satisfiability problem, and (e) the design of multiplierless quadrature-mirror-filter digital filter banks. Our method achieves better solutions than existing methods, or …
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Iterative least squares algorithms for digital filter design.
… simplify and improve the design of IIR digital filters and M-band cosine modulated filter banks. These algorithms are based on the Iterative Least Squares (ILS) approach. We first review the various Iterative Reweighted Least Squares (IRLS) methods used to design Chebyshev and $L\sb{p}$ linear …
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Backward Adaptive Motion Representation and Video Coding
… we consider the design of signal-adapted subband filter banks to be incorporated into our wavelet video coder, for the purpose of further improving compression efficiency, and for protection against channel errors in practical video communication. Our designs are formulated as constrained …
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FIR filter design using Jacobian elliptic Sn function with wavelet applications.
This thesis presents a new method of digital FIR filter design based on the Jacobian elliptic sine function. In addition to a general design, a special result is obtained for Quadrature Mirror Filters (QMF) for use in multi-resolution filter banks. These are called Quasi-Dyadic FIR filters. Most of …
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Material selection and nanofabrication techniques for electronic photonic integrated circuits
… One such device is a bank of microring-resonator filters with precisely spaced resonant frequencies. In this work, a fabrication strategy based on scanning-electron-beam lithography (SEBL) is presented for precisely controlling the resonant frequency of microring-resonator filters. Using this …
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Filter-bank transforms with exact inverses
Uniformly sampled filter-bank transforms and their inverses are introduced and the conditions to obtain perfect reconstruction upon inversion are explored. It is shown that perfect reconstruction requires both filter addition and multiplication and the necessary and sufficient conditions for these …
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Texture measures for segmentation
… types of texture descriptors are investigated: filter bank based methods and local descriptors. Filter banks deconstruct an image into several bands, each of which emphasises areas of the image with different properties. Textons are an adaptive histogram method which describes the distribution …
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Multisensor Signal Processing: Theory and Algorithms for Image -Based Rendering and Multichannel Sampling
… sampling applications, we consider hybrid filter banks consisting of fractional delay operators, analog analysis filters, slow A/D converters, digital expanders, and digital synthesis filters to approximate a fast A/D converter. The synthesis filters are to be designed to minimize the …
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Nonuniform subbard coding of high quality audio signals employing frequency warping
… research into the application of a nonuniform filter bank employing frequency warping to digital audio coding is described. Firstly, some aspects of psychoacoustics, especially masking effects, are studied. Utilising psychoacoustic models, perceptual entropies are calculated for a number of …
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Exploring Deep Learning Methods for Discovering Features in Speech Signals
… such as Mel Cepstral Coefficients and Mel log filter banks for speech recognition. We start by showing that features learnt on raw signals using Gaussian-ReLU Restricted Boltzmann Machines can achieve accuracy close to that achieved with the best traditional features. These features are, …
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FPGA based Uniform Channelizer Implementation
… performance and frequency response. The uniform filter-banks are one of the most essential unit in channelization. The Generalised Discrete Fourier Transform Modulated Filter Bank (GDFT-FB), as an important variant of basic a DFT-FB, has been implemented in FPGA and demonstrated with a better …
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