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 3917 for “"filter"”.
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Active filter techniques for reducing EMI filter capacitance
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Compact microstrip bandpass filter
In microwave communication systems, the bandpass filter is an essential component, which is usually used in both transmitter and receiver. Parallel-coupled microstrip bandpass filter is one of the most popular filters in communication systems. However, this arrangement of parallel-coupled …
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Easy-filter: A Design, Verification, and Validation Tool for Finite Impulse Response (FIR) Filter
… automates the design implementation of the FIR filter, which engineers can easily modify in less time. The first step is to generate the design and testbench code of the FIR filter and simulate using Modelsim. The second step is to validate this design by comparing its results against already …
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Switch capacitor filter design aids
Two aids for the design of switched-capacitor filters (SCFs) are examined: breadboard modelling and computer simulations. A breadbroad was constructed based upon the same passive prototype of a seventh-order integrated filter. The breadboard met the original design specifications better than the …
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Comparison of two nonlinear filtering techniques - the extended Kalman filter and the feedback particle filter
… importance sampling can be avoided in particle filter through an innovation structure inspired by traditional nonlinear filtering combined with optimal control and mean-field game formalisms. The resulting algorithm is referred to as feedback particle filter (FPF). The purpose of this thesis is …
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Crystal filter tuning using machine learning.
Manual tuning of electronic filters represents a time-consuming process which can benefit from some computer assistance. A prototype computer-based system for the tuning of crystal filters after manufacture was developed. This system solved the problem of crystal filter tuning in a novel way. The …
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Integrated Filter Antennas for Wireless Transceivers
… the research carried out on the integration of filters and antennas for wireless transceivers. Filters and antennas are parts of wireless transceivers of all wireless communication systems. Filters and antennas, albeit connected, are separate circuits which take up their own individual space in …
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Monolithic In-Plane Tunable Optical Filter
… (MEMS) monolithic in-plane tunable optical filter in both Indium Phosphide and Silicon. By placing one mirror of a waveguide-based Fabry-Perot interferometer on an electrostatically-actuated beam, a tunable filter is constructed. This is the first demonstration of a waveguide-coupled MEMS …
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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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Feedback particle filter and its applications
The purpose of nonlinear filtering is to extract useful information from noisy sensor data. It finds applications in all disciplines of science and engineering, including tracking and navigation, traffic surveillance, financial engineering, neuroscience, biology, robotics, computer vision, weather …
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Strength of drilling fluid filter cakes
… An alternative approach is the idea of using the filter cake that forms against the wellbore rock to create a robust seal, the efficacy of which will depend on cake strength. However, little is currently understood about filter cake strength and how it is impacted by typical particulates in the …
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Investigation of the epoch state filter.
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1972
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Siphon filter assessment for Northern Ghana
The siphon filter is a household water filter developed by the Basic Water Needs Foundation based on the design of ceramic candle filters. The siphon filter is marketed under brand names CrystalPur and Tulip and is sold for roughly US$10. An independent Dutch laboratory found log reductions of …
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Sensitivity analysis of digital filter structures
… space recursive, finite wordlength, digital filters is developed and its relationship to the filter output quantization noise power is derived. The sensitivity measure is simply the sum of the L₂ norm of all first order partials of the system function with respect to the system parameters; …
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Input filter compensation for switching regulators
An input filter is often required between a switching regulator and its power source due to the need of preventing the regulator switching current from being reflected back into the source. The presence of the input filter often results in various performance difficulties such as loop instability, …
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Aerobic digestion of trickling filter humus
… was to study the aerobic digestion of trickling filter humus and the relationship between digestion and the subsequent filterability of the sludge. Five individual, ten liter, batch-type digestion studies were conducted at 20°C for detention periods ranging from 22 to 38 days. Various water …
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Neusch Automated Filter System: A Custom-Designed Photo-Filter Switching Apparatus for Embry-Riddle’s 1 Meter Telescope
… the use of a traditional device known as a filter wheel.</p> <p>Filter wheels store multiple photo-filters each capable of filtering out all but certain wavelengths of light for use with a CCD camera. Therefore, a filter wheel allows the telescope user to conveniently select and change …
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Investigation on different vertical aerated rock filter (vertical aerated rock filter) in removing phosphorus from domestic wastewater
… algae which can accelerate eutrophication. Rock filter (RF) has appeared as an alternative technology to remove phosphorus from wastewater. In response to this, the selection of media between steel slag and limestone for pilot scale filter has been investigated by receiving the same volumetric …
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