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 22 for “"Dither"”.
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Global optimization of dither arrays
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Force-guided assembly using tuned dither and recursive parameter estimation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Offset correction techniques for imaging sensors using random dither information
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Suppression of Limit Cycles in Digital Filters
The injection of randan dither to suppress limit cycle oscillations in second-order direct form digital filter sections is discussed. Three types of dither signal are used: uniformly distributed random dither, binary randan dither and bandstop dither. All the limit cycles in the second-order filter …
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Applications of almost periodic functions and equivalent nonlinearities to identification and control of nonlinear systems
… 4 the application of high frequency signals (dither) as a technique to be used in the identification of certain open and pl,osed loop nonlinear systems is discussed. It is shown that certin types of dither permit linearization or elimination of nonlinear channels in certain open and closed …
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Analysis and Dynamic Range Enhancement of the Analog-to-Digital Interface in Multimode Radio Receivers
… such as nonuniform quantization, companding, and dither are presented. The development of a novel A/D using a direct-sequence pseudo-noise (DSPN) technique in conjunction with an asymmetrical quantizer is presented and compared with standard dither techniques. Advantages of this technique compared …
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Design and Analysis of Multilevel Coded Modulation for Multi-Node Networks
… separate encoders operating on the data and the dither components. This technique leads naturally to the construction of multilevel codes for the AWGN wiretap channel where the message and the dither are encoded through separate levels without compromising secrecy. The effect of maximum …
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ANALYSIS AND DESIGN OF PERIODICALLY TIME-VARYING DIGITAL FILTERS
… filters with highly quantized coefficients that dither or vary periodically with time, it was shown that under general circumstances the optimal structure is time-invariant (i.e., non-dithering). In addition to analyzing previously developed filters, a new class of filters, called operator …
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A feature-based fingerprinting scheme robust to desynchronization
… securely and invisibly using Spread Transform Dither Modulation (STDM) applied to the intermediate level of a Laplace decomposition of the image. The fingerprints are robust against common attacks such as averaging, interleaving, addition of Gaussian noise, JPEG compression (with quality factor …
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System architecture for mode-matching a MEMS gyroscope
… matches that of the resonator. A square wave dither signal is introduced as quadrature error and is used to track the phase across the gyroscope's accelerometer. At mode-match, the phase lag is 90°, so the feedback mechanism maintains this 90° of phase lag between the input acceleration and …
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A stabilized master laser system for differential absorption LIDAR.
… optical switching, facilitating the use of deep dither modulation that aids in accurate stabilization to weak absorption lines. Furthermore, ratiometric detection in the control loop suppresses interference caused by back reflections in optical fiber components, as well as amplitude modulation of …
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Communication Protocol Design Considerations For Highway Vehicle Platoons And Enhanced Networked Robustness By Stochastic Dithers
… equations to add a scaled stochastic dither under which tolerable</p> <p>gain uncertainties can be much enlarged, beyond the traditional deterministic</p> <p>optimal gain margin. Algorithms, stability, convergence, and robustness are presented</p> <p>for first-order systems. Extension …
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Manipulations of spike trains and their impact on synchrony analysis
… around their original position (referred to as dithering). I provide analytical expressions of the probability of coincidence detection after dithering. The effectiveness of spike dithering in creating surrogate data strongly depends on the dithering method and on the method of counting …
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Design and analysis of digital watermarking, information embedding, and data hiding systems
… practical implementations of QIM methods called dither modulation and demonstrate their performance both analytically and through empirical simulations.
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Hydraulically controlled magnetic bougienage for correction of long-gap esophageal atresia
… when the O-ring friction is compensated with dither. This bench level experiment shows promising results and forms the basis for further efforts towards utilization in patients.
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Dynamic Modeling and Model-Free Real-Time Optimization for Cold Climate Heat Pump Systems
… Seeking Control (ESC). By utilizing periodic dither inputs for online gradient estimation, ESC bears significant robustness against process variation and external disturbance, which has proved to be more advantageous in handling the challenging applications like heating, ventilation and air …
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Advanced data acquisition and exploitation in scanning near-field (magneto-)optical microscopy
… E.g., a novel detection mode may exploit the dither motion of the tip, which is always present for the purpose of distance regulation, for an advantageous modulation of the optical signal.
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Fpga-based Design Of A Maximum-power-point Tracking System For Space A
… blocks, such as the ADC interface, FIR filter, dither generator, and DAC interface, needed to support the MPPT control system are integrated within the same FPGA device thus streamlining the part composition of the physical prototype used to build this control system.
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A new dynamic mode for fast imaging in atomic force microscopes
… The control design uses the vertical and dither (shake) piezo-actuators to make the probe deflection signal track an appropriately designed trajectory. The underlying idea is to treat the nonlinear tip-sample interaction forces as an extraneous disturbance and derive an optimal control …
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A communications system perspective for dynamic mode atomic force microscopy, with applications to high-density storage and nanoimaging
… the cantilever is forced sinusoidally using a dither piezo. The oscillating cantilever gently taps the sample which reduces the probe-sample wear. In this dissertation, we demonstrate that viewing the dynamic mode operation from a communication systems perspective can yield huge gains in …
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