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 51 for “"Noise suppression"”.
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Selective Attention: Noise Suppression and Signal Enhancement
… conditions containing no competing or irrelevant noise elements has become a topic of increasingly widespread interest in visual information processing. The results of many early detection studies suggest that attention is the filtering out of noise items in a visual display. More recent research …
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Noise suppression with non-air-acoustic sensors
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Acoustic noise suppression for helicopter communication systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Noise Suppression in OCDMA Networks using Nonlinear Optical Devices
… access interference (MAI) and optical beat noise which severely impairs system performance. A number of solutions have been proposed to mitigate these noise sources. Increasing the optical code lengths used can reduce the level of optical beat noise, however this is generally at the expense …
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Temperature and Thermal Noise Suppression for Precision Mechanical Experiments
… such that the sensor is not dominated by thermal noise and the sensor can be cooled to the ground state. This thesis creates scaling laws for the interaction between the mass size bonded to a membrane resonator and the resonator's quality factor. With such a resonator, the entanglement is …
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Unsupervised Learning Algorithm for Noise Suppression and Speech Enhancement Applications
… is contaminated by interference and background noise). The enhanced speech signal is then analyzed locally or in cloud to extract the command. This speech enhancement task may effectively be achieved if the number of recording microphones is large. But incorporating many microphones is only …
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Intensity noise suppression using a semiconductor optical amplifier: characterisations and applications
… system-level study of the intensity noise suppression offered by a saturated semiconductor optical amplifier (SOA), and its application to high channel count spectrum-sliced and optical code division multiplexed (OCDMA) systems incorporating low-cost incoherent light sources. …
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Acceleration of the noise suppression component of the DUCHAMP source-finder
… algorithm which suppresses erratic observation noise. This algorithm is the most computationally expensive and memory intensive within DUCHAMP and consequently improvements to it greatly improve overall DUCHAMP performance. We present a high performance, multithreaded implementation of the à …
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A dual detector optical heterodyne receiver for local oscillator noise suppression
Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
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Novel approaches to Newtonian noise suppression in interferometric gravitational wave detection
… of 1018 m and thus requires multiple levels of noise reduction to ensure the isolation of the interferometer components from numerous sources of noise. A substantial contributor to the Advanced LIGO noise in the 1-10 Hz range is Newtonian (or gravity gradient) noise which arises from local …
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Development and implementation of efficient noise suppression methods for emission computed tomography
… rely on regularization terms to suppress image noise and render radiotracer distribution with good image quality. The choice of regularization method substantially affects the appearances of reconstructed images, and is thus a critical aspect of the reconstruction process. Major contributions of …
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Techniques for noise suppression and robust control in spin-based quantum information processors
… quantum information processor is the control and suppression of environmental noise that decoheres the quantum system and causes it to behave classically. Environmental errors may be dynamically suppressed by applying coherent control pulses to the qubits that decouple the environment. However, …
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Design of power delivery networks for noise suppression and isolation using power transmission lines
… the IR drop and to suppress the inductive noise during data transitions. As a result, most PDNs in high-speed systems consist of power and ground planes to provide a low-impedance path between the voltage regulator module (VRM) and the integrated circuit (IC) on the printed circuit board …
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Improving the quality of speech in noisy environments
… to be heard by humans, and hence we approach the noise-suppression problem from a perceptual perspective. We develop a noise-suppression paradigm that is based on a model of the human auditory system, where we process signals in a way that is natural to the human ear. Under this paradigm, we …
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Segmentation of brain x-ray CT images using seeded region growing
… They are intracranial volume extraction, noise suppression and automated segmentation of X-Ray Computerized Tomography (CT) images. The segmentation scheme is based on a Seeded Region Growing algorithm. The intracranial volume extraction is based on image symmetry and the noise suppression …
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Structures and algorithms for two-dimensional adaptive signal processing
… cancellation, predictive coding, and noise suppression. Emphasis is placed both on FIR and IIR structures with primary benchmark issues being speed of convergence, computational complexity, and structural flexibility.
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On the data hiding theory and multimedia content security applications
… is not very efficient due to its poor host noise suppression. The watermark domain selection problem is addressed subsequently. Some implications on hiding capacity and reliability are also studied. The last topic in SS modulation scheme is the sequence selection. The relationship between …
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Aeroacoustics Applications to Jets and Rotors
… This dissertation investigates two key topics: noise suppression in supersonic rectangular jets and rotor noise characterization in hover and ground effect. Using high-fidelity numerical simulations and theoretical analyses, this research aims to develop effective noise mitigation strategies and …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
… interferometry through the use of pseudo-random noise codes. It allows time-of-flight multiplexed precision sensing with interferometric sensitivity by using these codes to identify the signal of interest, while rejecting spurious noise sources and undesired signal channels. This thesis aims to …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
… interferometry through the use of pseudo-random noise codes. It allows time-of-flight multiplexed precision sensing with interferometric sensitivity by using these codes to identify the signal of interest, while rejecting spurious noise sources and undesired signal channels. This thesis aims to …
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