DATA ADAPTIVE SPECTRAL ANALYSIS METHODS

Geophysics ◽  
1971 ◽  
Vol 36 (4) ◽  
pp. 661-675 ◽  
Author(s):  
R. T. Lacoss
Keyword(s):  
Maximum Entropy Method ◽  
Entropy Method ◽  
Likelihood Method ◽  
New Techniques ◽  
Spectral Density Estimation ◽  
New Methods ◽  
Statistical Fluctuations ◽  
Spectral Estimates ◽  
Power Spectral ◽  
Data Adaptive

Two new methods (Maximum Likelihood Method or MLM, and Maximum Entropy Method or MEM) for power spectral density estimation have been experimentally investigated. Both methods, unlike conventional methods, adapt to the actual characteristics of the noise process under study. The new techniques are particularly valuable if the process contains one or more narrow peaks in frequency which are to be resolved. In this case, the output peaks from MEM are proportional to the square of the power in the narrow peaks but the area is equal to power. The peak values of the MLM reflect power directly. Both methods yield the true spectrum if the spectrum changes slowly enough with frequency. Neither of the new methods appears to be unduly sensitive to small statistical fluctuations of the estimated correlation function used to obtain spectral estimates.

scholarly journals CALCULATION OF DIRECTIONAL WAVE SPECTRA BY THE MAXIMUM ENTROPY METHOD OF SPECTRAL ANALYSIS

1984 ◽  
Vol 1 (19) ◽  
pp. 33 ◽  
Author(s):  
MIchael J. Briggs
Keyword(s):  
Spectral Analysis ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Adaptive Method ◽  
Entropy Method ◽  
Wave Spectra ◽  
Spectral Estimates ◽  
Directional Wave ◽  
Data Adaptive ◽  
Using Data

Two analysis techniques for calculating directional wave spectra from measured pressure and biaxial current components were intercompared using data from the 25 October 1980 Atlantic Remote Sensing Land Ocean Experiment (ARSLOE) storm. The two methods are the conventional Fast Fourier Transform (FFT) method and a Maximum Entropy Method (MEM). The MEM is a nonlinear data adaptive method of spectral analysis which is capable of generating higher resolution spectral estimates from shorter data records than conventional FFT methods. The MEM has shown good agreement with the frequency and directional wave spectra calculated using conventional methods.

scholarly journals The Use of Bayesian Statistics in Image Estimation from Interferometer Data

1979 ◽  
Vol 49 ◽  
pp. 227-234
Author(s):  
T. J. Cornwell
Keyword(s):  
Maximum Likelihood ◽  
Bayesian Statistics ◽  
Maximum Entropy Method ◽  
Maximum Likelihood Method ◽  
Entropy Method ◽  
Likelihood Method ◽  
Image Estimation ◽  
Long Baseline ◽  
Sky Brightness ◽  
Data Adaptive

The problem of estimating radio sky brightness distributions from incomplete, and noisy, visibility measurements, such as those collected by a long baseline interferometer, has recently been attacked using nonlinear data-adaptive techniques such as the Maximum Entropy method (Abies (1974), Wernecke (1976), Wernecke and D’Addario (1977), Gull and Daniell (1978)) and the Maximum Likelihood method (Papadopoulos (1975)).

Mayer Waves in Dogs with Total Artificial Heart

1992 ◽  
Vol 15 (10) ◽  
pp. 601-605 ◽  
Author(s):  
T. Yambe ◽  
S. Nitta ◽  
Y. Katahira ◽  
T. Sonobe ◽  
S. Naganuma ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Maximum Entropy Method ◽  
Power Spectral Analysis ◽  
Entropy Method ◽  
Total Artificial Heart ◽  
Ventricular Assist Devices ◽  
Ventricular Assist ◽  
Mayer Waves ◽  
System A ◽  
Power Spectral

To assess the effect of a total artificial heart (TAH) on the autonomic nervous system a power spectral analysis of the hemodynamics in a TAH animal was done by the maximum entropy method. Two pneumatically driven sac-type ventricular assist devices were implanted as total biventricular bypass (BVB) in adult mongrel dogs to compare the differences between natural heart and TAH. Once the BVB was pumping, the natural heart was electrically fibrillated to constitute the BVB-type TAH model. In the arterial pressure waveform in animals with TAH, respiratory waves were not changed (97.7±24.6%) though Mayer waves were significantly decreased (47.5 ± 22.6%) compared with the animal with a natural heart. These results suggest that prosthetic hemodynamics in the TAH animal affect fluctuations in the cardiovascular system.

Twenty-Four-Hour Power Spectral Analysis by Maximum Entropy Method of Blood Pressure in Primary Hyperaldosteronism

1993 ◽  
Vol 2 (3) ◽  
pp. 189-196 ◽  
Author(s):  
Franco Veglio ◽  
Giuliano Pinna ◽  
Remo Melchio ◽  
Franco Rabbia ◽  
Paola Molino ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Spectral Analysis ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Power Spectral Analysis ◽  
Entropy Method ◽  
Primary Hyperaldosteronism ◽  
Power Spectral

The role of temperature in reported chickenpox cases from 2000 to 2011 in Japan

2015 ◽  
Vol 143 (12) ◽  
pp. 2666-2678 ◽  
Author(s):  
K. HARIGANE ◽  
A. SUMI ◽  
K. MISE ◽  
N. KOBAYASHI
Keyword(s):  
Least Squares ◽  
Maximum Entropy Method ◽  
Least Squares Method ◽  
Meteorological Factors ◽  
Meteorological Data ◽  
Entropy Method ◽  
Spectral Lines ◽  
Power Spectral ◽  
Power Spectral Densities

SUMMARYAnnual periodicities of reported chickenpox cases have been observed in several countries. Of these, Japan has reported a two-peaked, bimodal annual cycle of reported chickenpox cases. This study investigated the possible underlying association of the bimodal cycle observed in the surveillance data of reported chickenpox cases with the meteorological factors of temperature, relative humidity and rainfall. A time-series analysis consisting of the maximum entropy method spectral analysis and the least squares method was applied to the chickenpox data and meteorological data of 47 prefectures in Japan. In all of the power spectral densities for the 47 prefectures, the spectral lines were observed at the frequency positions corresponding to the 1-year and 6-month cycles. The optimum least squares fitting (LSF) curves calculated with the 1-year and 6-month cycles explained the underlying variation of the chickenpox data. The LSF curves reproduced the bimodal and unimodal cycles that were clearly observed in northern and southern Japan, respectively. The data suggest that the second peaks in the bimodal cycles in the reported chickenpox cases in Japan occurred at a temperature of approximately 8·5 °C.

Comparison of Methods for Short Crested Wave Analysis

2011 ◽  
Author(s):  
Joris van den Berg
Keyword(s):  
Maximum Likelihood ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Maximum Likelihood Method ◽  
Entropy Method ◽  
Likelihood Method ◽  
Comparison Of Methods ◽  
Wave Analysis ◽  
Small Footprint ◽  
Probe Array

A comparison was made of the robustness and accuracy of Maximum Likelihood Method (MLM) and Maximum Entropy Method (MEM) short crested wave analysis using a small footprint probe array.

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