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 119 for “"Aliasing"”.
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Time Aliasing Methods of Spectrum Estimation
Time aliasing methods of spectrum estimation alter the time representation of a signal for the purpose of improving its frequency domain representation. Time aliasing allows characteristics of longer time window functions to be used with shorter DFT length. Windows designed specifically for use …
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Impedance- and spatial-domain aliasing in interference management techniques
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Experimental results on aliasing errors in circular BIST design
… suffer from loss of information, known as aliasing. Aliasing is said to occur in a response compaction technique when the response generated by the circuit, under the presence of a fault, is different from its fault-free response, but this information is later lost during compaction, and …
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High-speed infrared video system for detection of thermal aliasing.
… 15 Hz, in this case) result in an effect called aliasing, which gives misleading information about the scene's true temporal content. Decreasing the camera's integration time (analogous to shutter speed) reduces blurring in the image, but the presence of aliasing is solely determined by the …
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The Design of an Anti-Aliasing Filter for the Next Generation Digitiser
MeerKAT, is a 64-element radio astronomy antenna array which has been recently constructed in the Northern Cape Province of South Africa. It serves as South Africa's contribution towards the international Square Kilometre Array (SKA) project. The MeerKAT array has been designed to observe radio …
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The effects of electronic microscanning on infrared image aliasing and spaial resolution
… criteria for sampling systems. Consequently, aliasing effects are usually an inherent part of images produced by staring arrays. Microscanning is a method which can be used to reduce spatial frequency aliasing within an image by spatially oversampling the image scene. During the microscanning …
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Single-Step Factor Screening and Response Surface Optimization Using Optimal Designs with Minimal Aliasing
… designs based on projection properties first and aliasing structure second. However, having good projection properties is of little concern if the correct factors cannot be identified. We apply Jones and Nachtsheim’s (2009) method for finding optimal designs with minimal aliasing to find 18, 27, …
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An Investigation of Performance Limitations in Active Noise Reduction Headsets
… of the control speaker's diaphragm, the anti-aliasing filter, and the smoothing filter. Additionally, it is demonstrated that the acoustic wave propagation from the control speaker to the error microphone is not a major contributor of phase lag. Based on these results, it was determined that …
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Design and development of a composite frequency response analyser
… and the potential problems associated with aliasing have been analysed. In order to avoid the complexity and expense associated with anti-aliasing filters however, no such filter has been incorporated within the instrument. In place of a filter, a new anti-aliasing compensation technique has …
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The Design and Implementation of the Tako Language and Compiler
Aliasing complicates both formal and informal reasoning and is a particular problem in object-oriented languages, where variables denote references to objects rather than object values. Researchers have proposed various approaches to the aliasing problem in object-oriented languages, but all use …
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Digital core output test data compression architecture based on switching theory concepts: Model implementation and analysis
… The approaches developed to designing zero-aliasing space compressors utilizing additionally concepts of strong and weak compatibilities of response data outputs are novel in the sense that zero-aliasing is achieved without modification of the MUT, while maximal compaction is achieved in …
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IMPROVING GLOBAL ILLUMINATION WITH A-BUFFER TECHNIQUE
… the accuracy by applying the A-buffer anti-aliasing technique to handle the hemicube visibility and aliasing, thereby alleviating this inaccuracy that was originally caused by the under/over estimation of the projections on the hemicube pixels. An appropriate meshing scheme, based on the …
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Issues in Design for Testability and Self-Test
… and system level, and a fault-model based aliasing analysis of signature analyzers in random testing.
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Applications of nonuniform sampling in wideband multichannel communication systems
… range of overseen frequencies. By harnessing the aliasing suppression capabilities of such sampling schemes, it is shown that certain processing tasks, namely spectrum sensing, can be performed at significantly low sampling rates compared to those demanded by uniform-sampling-based digital signal …
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Surface modeling and rendering with line segments
… For the task of rendering, we extend the anti-aliasing theory in texture mapping to anti-aliased line segment rendering, and present an approximation algorithm to render high quality anti-aliased opaque, transparent and textured line segments in 3D models. The anti-aliasing rendering technique …
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Preserving Unique References in Java Lists
The Java collection framework introduces aliasing when objects are added to and accessed from collections. This thesis describes a list component implemented in Java that preserves unique references of objects in the list, thereby avoiding undesired aliasing. We compared the running time of our …
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Sampling and quantization for optimal reconstruction
… can be preferable in certain applications to the aliasing artifacts, which occur in uniform sampling. The thesis also explores various approaches to avoiding aliasing in sampling. These approaches exploit additional information about the signal apart from its bandwidth and suggest using …
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Implicit-explicit methods for time-dependent PDE’s
… in the context of fast multigrid algorithms and aliasing reduction for spectral methods. For the prototype linear advection-diffusion equation, a stability analysis for first, second, third and fourth order multistep IMEX schemes is performed. Stable schemes permitting large time steps for a wide …
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Hardware accelerated computer graphics algorithms
… utilises Fourier space image filtering to reduce aliasing. Investigation shows that the technique provides reduced levels of aliasing along with comparable levels of detail to currently popular techniques. This adds to the community's knowledge by expanding the range of techniques available, as …
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