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 1171 for “"signal-to-noise"”.
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Enhancing signal to noise ratio for electrostatic transducers
… utilises a pipe as an amplification mechanism to increase the output pressure; and as a dissipation mechanism to reduce inherent noise within the transducer. The new transducer design introduces the concept of matched thin plate, cavity and pipe, of which the individual geometry enhances one …
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Improving the Signal-to-Noise of Nanopore Sensors
… years, solid state nanopore technology advanced to rival biological pores as a platform for next generation DNA sequencing. Fabrication improvements led to a reduction in nanopore diameter and membrane thickness, offering high precision sensing. Custom electronics were developed concomitant with …
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Control and Communication with Signal-to-Noise Ratio Constraints
… involve communication over an additive white noise channel with a signal-to-noise ratio (SNR) constraint. The first problem concerns the transmission of a real-valued signal from a partially observed Markov source. The distortion criterion is the mean squared error and the transmission is …
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Methods for Improving Signal to Noise Ratio in Raman Spectra
Raman microspectroscopy is an optoelectronic technique based on the inelastic scattering of light. This technique has been demonstrated to have potential to identify different materials based on subtle differences in the Raman spectral profile using various multivariate statistical classification …
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Determining signal-to-noise ratio in a burst coherent demodulator
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Use of intermicrophone correlation in estimating signal to noise ratio
… gathered at two spatially separate microphones to determine the signal to noise ratio in the environment. This work is motivated by past research in microphone array hearing aids, where accurate estimates of SNR were shown to improve performance. Signal to noise ratio is defined as the ratio of …
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Basic and Practical Signal-to-Noise Considerations in Laser-Raman Spectrometry
Made available in DSpace on 2014-12-09T17:36:24Z (GMT). No. of bitstreams: 1 7000815.pdf: 4684919 bytes, checksum: 26c902920a4aceb92a53aaada9b2223b (MD5) Previous issue date: 1969
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Increasing Signal to Noise Ratio and Minimising Artefacts in Biomedical Instrumentation Systems
… solution, an Analog Frontend (AFE), was designed to detect any vertical (Y-Plane) or horizontal (X-Plane) movement of the electrode using two strain gauges, which were separated by 90° and fitted onto the electrode. The detected motion was fed back to the system for the removal of any motion …
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Theoretical Considerations in the Estimation of the Signal-to-Noise Crossover Dose
… of the point of departure. However, due to some practical constraints, the method sometimes faces difficulty in determining an appropriate increase in risk that meets the definition of the reference dose. As an alternative, the method of the signal-to-noise crossover dose (SNCD) was …
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LOW POWER AND HIGH SIGNAL TO NOISE RATIO BIO-MEDICAL AFE DESIGN TECHNIQUES
… thesis was focused on finding novel techniques to implement a low-power and noise Bio-Medical Analog Front End (BMEF) circuit technique to enable high-quality Electrocardiography (ECG) sensing. Usually, an ECG signal and several bio-medical signals are sensed from the human body through a pair …
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Quantifying limitations on signal-to-noise ratio improvement in the stacking of seismic data
Includes bibliographical references (pages 122-125).
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Optical distribution networks : signal-to-noise ratio optimization and distributed erbium-doped fiber amplifiers
Two important issues related to the use of remotely-pumped erbium-doped fiber amplifiers in optical distribution networks are analyzed. We investigate the optimal allocation of gain and loss among the stages of a lumped amplifier chain, using the concepts of a Nash solution and Pareto optimality. …
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Phase multipath estimation for global positioning system (GPS) using signal-to-noise-ratio (SNR) data
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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A comparison of signal-to-noise characteristics : Fourier transform enhanced magnetic rotation spectroscopy and dispersive spectrometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Particle Image Velocimetry Correlation Signal-to-noise Metrics, Particle Image Pattern Mutual Information and Measurement uncertainty Quantification
… particle image velocimetry (PIV) the measurement signal is contained in the recorded intensity of the particle image pattern superimposed on a variety of noise sources. The inherent amount of signal mutual information between consecutive images governs the strength of the resulting PIV cross …
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Development and validation of a theoretical model for optimizing signal-to-noise ratio in x-ray fluorescence imaging
There has been a growing interest in benchtop X-ray Fluorescence Computed Tomography (XFCT) due to its potential to non-invasively image non-radioactive targets at greater depths than optical techniques. However, this modality suffers from limited sensitivity due to the high scattering background …
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Analysis of signal-to-noise ratio of angle and degree of linear polarization in division of focal plane polarimeter
… in nanofabrication technology has led to commercialization of single-chip polarization and color-polarization imaging sensors in the visible spectrum. Novel applications have arisen with the emergence of these sensors leading to questions about noise in the reconstructed polarization …
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Performance of orthogonal frequency division multiplexing in a high noise, low signal-to-noise ratio environment with co-channel interference
… Multiplexing (OFDM) is fast becoming the signal modulation technique of choice for many commercial and military wireless applications. Its resilience to cochannel interference and bandwidth efficiency make it ideal for many different applications. With its increasing popularity among …
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