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 180 for “"low-pass"”.
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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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Rf Low Pass Filter Design And Fabrication Using Integrated Passive Device Technology
In this thesis, the whole process of design a low pass filter (LPF) for the wireless communication application has been presented. Integrated passive device technology based on GaAs substrate has been utilized to make the LPF. Schematic simulation and electromagnetic simulations are extensively …
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Design of Finite Impulse Response Low-Pass Digital Differentiators for Signals in Paley-Wiener Space
<p>Linear Finite Impulse Response (FIR) models for signals in Paley-Wiener space are developed in this thesis. A set of FIR models are derived where the filter coefficients only depend on the bandwidth and the sampling interval. There exists an anti-symmetry in the filter coefficients among …
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Integrated realizations of reconfigurable low pass and band pass filters for wide band multi-mode receivers
… the chosen architecture, the filters can exhibit low pass or band pass frequency responses.The idea of reconfigurable frequency parameters has been introduced since the beginning of modern filtering applications due to the required precision of the frequency response. However, the reconfiguration …
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Know Thy Cell-Free DNA: Early Detection of Microsatellite Instability Using Ultra-Low-Pass Cell-Free DNA Sequences
… Less expensive sequencing methods such as ultra-low pass (ULP) sequencing exist, but thus far have not been utilized for detection of microsatellite instability. In this thesis, we focus on 0.1× ULP sequences, in which about 10% of the genomic locations have one read in expectation. Having so few …
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Phased-locked loop study, simulation, and design of adaptive filter
… the etfeet on phase-locked loop operation of the pass band or the low-pass filter in the loop. From the findings, it was concluded that when the loop was out of lock, the pass band of the low-pass filter should be wide; however, when the loop was locked, the pass band of the low-pass filter should …
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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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Class E amplifiers and their modulation behaviour
… assumed that it can be modelled as a first order low pass filter. It is shown that Class E AM can be modelled as an equivalent circuit, which behaves as a second order low pass filter. Measurements confirm the analysis.
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AN INVESTIGATION OF SEISMIC ATTENUATION IN MARINE SEDIMENTS
… to be superior to the other techniques, followed by spectrum modelling and the spectral ratios method. Complex trace analysis using the analytical signal proved to be unreliable for non-sinusoidal wavelets, whilst the risetime method was found to be very susceptible to noise for practical …
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A zero-crossing switched-capacitor filter design
… technologies is becoming difficult because of low device intrinsic gain and reduced power supply voltage. To solve these problems, comparator-based switched-capacitor (CBSC) circuits and zero-crossing based circuits (ZCBC) were suggested as a possible solution to the op-amp based circuits. In …
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Unrolling of Graph Total Variation for Image Denoising
… proposed. It utilizes interpretable analytical low-pass graph filters and employs 80\% fewer parameters than a state-of-the-art DL denoising scheme called DnCNN. Specifically, to construct a graph for graph spectral filtering, a CNN is used to learn features per pixel, then feature distances are …
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Design of efficient digital interpolation filters for integer upsampling
… cascades an expander unit with an interpolation low-pass filter. More complex implementations can cascade multiple expander and low-pass filter pairs. There is also flexibility in the design of interpolation filters. This thesis explores how digital interpolation systems for integer upsampling …
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Design of digital differentiators
… (FIR) filters. The proposed differentiators have low-pass magnitude response characteristics, thereby rejecting noise frequencies higher than the cut-off frequency. Both steady-state frequency-domain characteristics and Time-domain analyses are given for the proposed differentiators. It is shown …
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Modeling and control of evolving, noisy chaotic dynamical systems
… whose control parameter changes in proportion to low-pass filtering of one of its dynamical variables. First, we study a noisy one-dimensional iterative map whose system parameter evolves randomly in time. We find that there is an optimal number of model parameters and that there is an optimal …
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All-Digital Audio Amplifier
… amplified by a switching power stage and finally low-pass filtered before it is sent to a speaker. The purpose of the digital signal processing (DSP) portion of the system is to transform the original audio information into a feasible, low-level PWM signal, with minimum possible degradation. The …
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Neural Network Learning for Time-Series Predictions Using Constrained Formulations
… noise. We incorporate constraints on predicting low-pass data in the lag period when a low-pass filter is employed to denoise the band. The new constraints enable active training in the lag period that greatly improves the prediction accuracy in the lag period. Extensive prediction experiments on …
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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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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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High-Speed Silicon-Germanium BiCMOS and Indium Phosphide DHBT Receiver ICs for Optical and Wireless Communications
… and their applications to VCOs (AIVCOs) and low-pass filters were designed and fabricated with the SiGe and InP processes. The InP AIVCOs demonstrate 20-GHz oscillation frequency and over 50% tuning range. The measured do power for a single InP active inductor is only 15 mW from a 4-V power …
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Predictive Control For Dynamic Systems To Track Unknown Input In The Presence Of Time Delay
… stable when input signal is rather low frequency signal. In order to illustrate the system performance, simulations are done based on the data profile technique. Signal profiles including acceleration pro le, velocity pro le, and trajectory profile are listed. Based on these …
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