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 70 for “"high pass"”.
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Investigation of High-Pass Filtering for Edge Detection in Optical Scanning Holography
High-pass filtering has been shown to be a promising method for edge detection in optical scanning holography. By using a circular function as a pupil for the system, the radius of the circle can be varied to block out different ranges of frequencies. Implementing this system in simulation yields …
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The Perceptions of Teachers Regarding the Instructional Practices and School Leadership Supports that Contributed to High Pass Rates in Algebra I for Minority Students in Rural Schools
In the United States, students must pass Algebra I to graduate from high school. The purpose of this qualitative study was to identify the instructional practices of teachers and leadership supports in rural secondary schools with a high pass rate among African American and Latino students in …
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Application of non-uniform sampling techniques to digital filter synthesis
… which determines the optimal parameters.for a high pass filter will be developed and used to synthesize the particular high pass filter. The results of this design, the frequency response and its approximation error will be studied and evaluated.
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Analysis of Multiresolution Data fusion Techniques
… a relatively coarse-resolution image with a higher resolution panchromatic image of the same geographic area. This study examines properties of fused images and their ability to preserve the spectral integrity of the original image. It analyzes five current data fusion techniques for three …
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Identifying the Cellular Sources of the Low-Frequency Cochlear Response
… through outer hair cells –in conjunction with high-pass noise or suppressing tones, shows promise as a method of assessing the health of outer hair cells at specific locations along the cochlear partition in rodent models. In this study, we propose that the electrical potential recorded from …
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Suspended stripline filters for ultrawide bandwidth and high RF power
… the design, synthesis, and measurement of high peak power ultra-wideband filters in suspended stripline. Ultra-wideband pre-selector filters play a vital role in current electronic warfare systems as they are expected to cover a wide passband and handle high power simultaneously. Suspended …
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Frequency, Attention, and Phonetic Characteristics that Influence the Right-Ear Advantage for Speech Perception
… Stimuli in Experiment 1 were unfiltered, high-pass filtered, or low-pass filtered, and stimuli in Experiment 2 were presented with no noise, white noise, high-pass filtered noise, or low-pass filtered noise. The initial consonants of each dichotic pair were categorized according to POA …
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Digital pulse interval modulation for indoor optical wireless communication systems
… interference from a fluorescent lamp driven by a high-frequency electronic ballast, which is potentially the most degrading source of ambient light. It is found that such interference results in an average optical power requirement that is almost independent of the bit rate. The analysis then goes …
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Habituation of the Goldfish Vestibulo-Ocular Reflex Is Frequency Specific and Nonlinear: An Experimental and Modeling Study
… decreased the time constant of the VOR high-pass filter model to simulate habituation, suggesting that habituation is a general phenomena. The present experiments in goldfish show that habituation is both nonlinear and nonstationary and is quite effective at low-frequencies. Habituation …
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An experimental determination of the effects of image quality on eye movements and search for static and dynamic targets
… of the image presented was varied by either passing, low-pass filtering, or attenuating the video signal and by adding electrical white noise to the video signal. The results of this experiment indicate that (1) at the highest level of electrical noise added, the percent of correct target …
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System (for) Tracking Equilibrium and Determining Incline (STEADI)
… For the processing both a median filter and a high pass filter are used. A Median filter is used to amplify/enhance the signal by removing impulsive noise while preserving the signal shape while the High pass filter is used to emphasise transitions in the signal. Then, in order to recognize a …
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Design and Testing of Off-The-Shelf Electronic Components for an Acoustic Emission Structural Health Monitoring System Using Piezoelectric Sensors
… uses the principles of active lamb wave and passive acoustic emission through the use of piezoelectric sensors as the sensing elements. Piezoelectric sensors can be used both as an input device and as a sensing element. This research focuses on the development of the major data acquisition …
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On the spectral information content of vowels
… as the error rates of lax vowels are far higher than those of tense vowels. Lax vowels rarely occur in a CV context in English. This seems to be a novel observation. The second experiment, HL11, examines the effects of filtering, using low-pass or high-pass filters at various cut-off …
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The amplitude-modulation-following response as an audiometric tool
… of the cochlear site-specificity of the AMFR in high-pass and low-pass masking paradigms and comparison of behavioral and AMFR thresholds using spectral analysis; (2) valuation of the influence of sleep on the AMFR; (3) examination of the effects of modulation frequency on the AMFR; and (4) …
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Assessing Satellite Image Data Fusion with Information Theory Metrics
… in remote sensing is estimating an image with high spatial and high spectral resolution given separate sources of measurements from satellite instruments, one having each of these desirable properties. This thesis presents a survey of seven families of algorithms which have been developed to …
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Multiport synthesis with multi-layered distributed parameter RC networks
… to implement in practical engineering problems, high and low frequency asymptotic relationships are given which are useful in practical design of networks. Design suggestions are given for notch, low pass, and high pass networks"--Abstract, page ii.
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Sistema autônomo tri-banda de aquisição e armazenamento de dados para caracterização de paisagem acústica submarina
… aiming to separate the frequency bands (low-pass, band-pass and high-pass filters), including amplifiers with gain adjustable through the microcontroller. Based on the design, a prototype was built, its features were obtained through bench tests and its performance tested in a hydrophone …
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Monocular vision for collision avoidance in vehicles
… systems. The monocular system pairs a camera and passive lens with an active lens. Most active lenses require linear actuating systems to adjust the optical parameters of the system but this experiment employed an Optotune focus tunable lens adjusted by a Lorentz actuator for a much more reliable …
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Design of an Analog Adaptive Piezoelectric Sensoriactuator
… the piezostructure using an adaptive first-order high-pass filter. Theoretical and experimental results are provided along with a discussion of the difficulties encountered in trying to achieve perfect compensation of the feedthrough capacitive charge on a piezoelectric wafer.
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Vibration Measurement Based Damage Identification for Structural Health Monitoring
… for real time applications. It is shown that the high-frequency content of the response acceleration can be used to identify the instant at which a structure suffers a sudden reduction in its stiffness value. Using the Gibb's phenomenon, it is shown why a high-pass filter can be used for …
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