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 28 for “"Low-Pass Filtering"”.
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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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MITIGATION OF GEAR MESH-FREQUENCY VIBRATIONS UTILIZING A HYDROSTATIC BEARING
… to be emitted as noise. The vibration energy flow can be disrupted, for example using a hydrostatic bearing as a low pass filter of vibrations while still preserving the positioning accuracy of the gear drive.</p><p>Hydrostatic bearings are a class of fluid bearings consisting of externally …
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On low-pass reconstruction and stochastic modeling of PWM signals
… in linear and non-linear blocks separately. Following the common practice, a comparator block with a periodic reference signal is offered as a PWM generator and different sampling methodologies are discussed. For natural sampling, where the input signal is compared to the reference signal …
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Numerical Study of Synthetic-Jet Actuation Effect on Airfoil Trailing Edge Noise
… accurate Navier-Strokes solver implementing a low-pass filtering of poorly resolved high-frequency solution content to retain numerical accuracy and stability over the range of transitional flow regimes. In the adopted numerical procedure, the actuator is modeled without its resonator cavity …
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A feedback analysis of outer hair cell dynamics
… high gain at characteristic frequencies and allowing for the sharp frequency selectivity and sensitivity observed in mammals. Excitatory displacement of the basilar membrane causes depolarization of OHC membrane potentials which results in contraction. The motor protein prestin is driven by …
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Spectral envelope estimation for transient event detection
… representation and as such can be estimated by low-pass filtering the current mixed with appropriate basis sinusoids. Spectral envelope estimators have been termed pre-processors. In this thesis, two pre-processors were designed. The first utilizes magic sine waves as the basis functions instead …
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A Multi-functional Touch Panel for Multi-Dimensional Sensing in Interactive Displays
… correlated double sampling (CDS) and spatial low-pass filtering (SLPF) based techniques, the signal-to-noise ratio (SNR) of the capacitive touch signal is boosted by 15.6 dB, indicating improved detection accuracy. In terms of the readout speed, fixed pattern and random pattern related …
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Estudo comparativo de diferentes métodos de alinhamento no eletrocardiograma de alta resolução
… for correct identification of high-frequency and low-amplitude signals, covered by interference. The optimization of the alignment method attenuates the effects of low pass filtering caused by alignment errors (AE), allowing the analysis of ventricular activation late potentials present in the QRS …
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Reflection seismic data acquisition and processing for enhanced interpretation of high resolution objectives
… to increase spatial sampling density and reduce low pass filtering associated with the array response. Whitening of the signal bandwidth was accomplished using Vibroseis whitening (VSW) and stretched automatic gain control (SAGC). A zero-phase wavelet-shaping filter was used to optimize the …
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A Numerical and Experimental Evaluation of the Turbulent Heat Flux in a Heated Jet in Crossflow
… air from a tube into a cooler turbulent duct flow is examined, as an analogy to film cooled turbine blades. Scale Resolving Simulations (SRS) are used to examine the flow numerically. A Detached Eddy Simulation (DES) methodology is examined but found to be ineffective at correctly capturing the …
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Measurements and models of electrically-evoked motion in the gerbil organ of Corti
… it provided a good view of the organ and allowed us to compare the resulting responses of hundreds of cells simultaneously. The tissue was stimulated electrically using sinusoidal current, and the resulting motion was captured at specific phases within the stimulus period using stroboscopic …
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AUTOMATIC DETECTION OF FACIAL FEATURES FOR 3D MODEL BASED CODING APPLICATIONS
… image. The iterative processes of framework are low pass filtering, thresholding and edge detection. To detect the accurate feature points, it is needed to estimate the feature windows, which include the feature points. Secondly, the feature windows can be estimated by using vertical integral …
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Design and analysis of mobile sensing systems : an environmental data collection swarm
… in a marine environment. This work presents a low cost, portable, and highly maneuverable platform as a method to collect, share, and process environmental data. Our platform is modular, allowing a variety of sensor combinations, and may yield a heterogeneous swarm. Kalman filters are utilized …
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Digital Watermarking Based Image and Video Quality Evaluation
… JPEG compression, JPEG2000 compression, Gaussian low-pass filtering, Gaussian noise distortion, H.264 compression and packet loss related distortion.
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Modeling wind forcing in phase resolving simulation of nonlinear wind waves
… product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts the ability of traditional phase averaged models to simulate their complex dynamics. We develop a novel …
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Turbulent Boundary Layers over Rough Surfaces: Large Structure Velocity Scaling and Driver Implications for Acoustic Metamaterials
… waves driven by pressure fluctuations from flow. A turbulent boundary layer scaling analysis was performed on zero-pressure-gradient turbulent boundary layers over rough surfaces, for 30,000≤〖Re〗_θ≤100,000. Relationships between fluctuating pressures and velocities were explored through the …
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Low-complexity methods for image and video watermarking
… distortions, mainly additive noise, scaling, low-pass filtering, and lossy compression. This method also requires a small amount of computations. The method generates a set of evenly distributed codewords that are constructed via an iterative algorithm. Every message bit is represented by one …
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DC-DC Converter Control System for the Energy Harvesting from Exercise Machines System
… no decrease in power until the voltage drops below the microinverter’s minimum input voltage. Once the microinverter turns off, the converter regulates as intended and turns the microinverter back on only to repeat this detrimental cycle. Training the neural network with the back propagation …
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Comparative design, modeling, and control analysis of robotic transmissions
… time responses when the torque signals were of low-frequency and amplitude, underscoring the complexity in modeling the transmission-internal stick-slip phenomena. The clear distinction between speed reducers and torque multipliers is theoretically and experimentally explored. The issue of …
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Ocular dominance and temporal dynamics in the venetian blind effect
… disparities diminish at frequencies much lower than from a geometric disparity (critical frequency). A generalized difference model (simple low-pass filter), does not account for the data from experiment 1. However, a gated generalized difference model, which applies low-pass filtering to …
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