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 300 for “"Noise Reduction"”.
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Shoeprint image noise reduction and retrieval
… being made, distortion, capture device-dependent noise, and cutting-out can be introduced. This thesis deals with the problems involved in the development of an automated shoeprint image classification/ retrieval system. Firstly, it is concerned with investigating the problem of noise and artefact …
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A receiver-compatible noise reduction system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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Fan noise reduction from a supersonic inlet
… conducted to investigate the radiation of fan noise through a supersonic inlet. A scaled-down model of an axisymmetric, mixed-compression, supersonic inlet (P-inlet) was used in conjunction with a 10.4 cm (4.1 in) diameter turbofan engine simulator as the noise source. The tests were conducted …
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The Effects of Noise Reduction on Social Behaviors
… Previous researchers have suggested that noise level reduction is correlated with generalized improvements in untreated social behaviors. It is not clear that this generalized effect can be assumed with different behaviors in different settings. In addition, the results of previous studies …
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Noise Reduction with Microphone Arrays for Speaker Identification
<p> The presence of acoustic noise in audio recordings is an ongoing issue that plagues many applications. This ambient background noise is difficult to reduce due to its unpredictable nature. Many single channel noise reduction techniques exist but are limited in that they may distort the desired …
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Noise reduction for ultrasound images using deep interpolation
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Noise reduction during diffusion tensor imaging of infants
Acoustic noise produced during echo planar imaging (EPI) has been known to reach excessive levels. In addition to causing general patient discomfort and anxiety, this level of noise makes the scanning of young children and infants particularly difficult. Infants are typically scanned while sleeping …
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Quantum noise reduction using squeezed states in LIGO
… new approaches to reducing the quantum noise will be needed to improve the sensitivity further. This quantum noise originates from the vacuum fluctuations that enter the unused port of the interferometer and interfere with the laser light. Vacuum fluctuations have the minimum noise …
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Oscillator Phase Noise Reduction Using Nonlinear Design Techniques
Phase noise from radio frequency (RF) oscillators is one of the major limiting factors affecting communication system performance. Phase noise directly effects short-term frequency stability, Bit-Error-Rate (BER), and phase-locked loop adjacent-channel interference. RF oscillator circuits contain …
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Quantum noise reduction with pulsed light in optical fibers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Investigating noise reduction in an octave-spanning Ti:sapphire laser
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.
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Heterogeneous (HG) Blankets for Improved Aircraft Interior Noise Reduction
… of heterogeneous (HG) blankets for improved reduction of the sound transmission through double-panel systems at low frequencies. HG blankets consist of poro-elastic media with small, embedded masses, operating similar to a distributed mass-spring-damper system. Although most traditional …
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EMI Noise Reduction Techniques for High Frequency Power Converters
… switch mode power supplies will cause severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density of …
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Flow Control Optimization for Improvement of Fan Noise Reduction
… a fan blade was conducted to improve tonal fan noise reduction by optimizing an existing flow control configuration. The current configuration consisted of a trailing edge Slot with a flow control area of 0.045 in² per inch span with an exit angle of -3.3° with respect to the blade exit angle. …
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Wall Features of Wing-Body Junctions: Towards Noise Reduction
… directivity of the facility acoustic background noise to be used to improve background subtraction methods for surface pressure fluctuation measurements. Surface pressure fluctuation spectra were taken ahead of the leading edge of the plate and along the surface of the models. These showed that …
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Perturbation Solution of Air-Water Mixture for Jet Noise Reduction
<p>This work investigates passive jet-noise mitigation using externally positioned air–water curtains that attenuate radiated sound without altering the underlying jet dynamics. Two classes of multiphase media are examined: a gaseous carrier phase containing dispersed liquid droplets, and a liquid …
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Optimization Of Wind Fence Enclosures For Infrasonic Wind Noise Reduction
… has been built and tested to optimize wind noise reduction at infrasonic frequencies between 0.01-10 Hz in order to develop a technology that is simple, cost effective, and improves upon the limitations of pipe and porous hose arrays. The effects of varying the fence's porosity, modifying …
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