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.
Results
Showing 1 to 20 of 881 for “"Signal to noise ratio"”.
-
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 …
-
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 …
-
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 …
-
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.
-
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 …
-
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 …
-
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 …
-
Quantifying limitations on signal-to-noise ratio improvement in the stacking of seismic data
Includes bibliographical references (pages 122-125).
-
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. …
-
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.
-
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 …
-
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 …
-
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 …
-
Sensor arrays for the measurement of dispersive, flexural waves in structures for signal-to-noise ratio enhancement and angle of arrival determination
… work examines the application of sensor arrays to structures. The wave equation solution of Euler-Bernoulli beam theory provides the structural model for this study. A review of basic array theories for the enhancement of signal-to-noise ratio (SNR) and determination of angle of arrival (AOA) …
-
Seismic amplitude fidelity study for quantitative analysis and its relation to stack-based signal-to-noise ratio estimation using the SEAM Arid model, with application to field data from the Powder River Basin
… my research I develop and implement quantitative tools to assess the seismic amplitude fidelity for quantitative interpretation in several land acquisition designs, and establish a signal-to-noise ratio (SNR) threshold for adequate quantitative analysis in complex near-surface environments. The …
-
Speech Reception Threshold in Noise
… literature is replete with studies attesting to the disproportionate difficulty experienced by individuals with certain high-frequency hearing impairments when listening in noise. It has been suggested that these listeners exhibit a signal-to-noise ratio deficit when compared to normal-hearing …
-
Use of principal component analysis with linear predictive features in developing a blind SNR estimation system
<p>Signal-to-noise ratio is an important concept in electrical communications, as it is a measurable ratio between a given transmitted signal and the inherent background noise of a transmission channel. Currently signal-to-noise ratio testing is primarily performed by using an intrusive method of …
-
Amplitude balancing in [tau]-p domain
An approach to balance the amplitude of seismic data in the Ï -Ï domain is introduced in this study. The idea of amplitude balancing technique is based on the following observation: In the Ï -Ï domain, direct wave, ground-roll, primary reflection, multiple and refraction arrivals are located at …
Page 1 of 45