Results 111 to 120 of about 66,725 (166)
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The Journal of the Acoustical Society of America, 1963
A model of ambient sea noise is developed under the assumption of a surface distribution of noise sources. Volume absorption and the effects of refraction and reflection over long-range paths are included. The derived directional noise field is expressed as a function of vertical arrival angle, with the parameters being velocity profile, surface ...
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A model of ambient sea noise is developed under the assumption of a surface distribution of noise sources. Volume absorption and the effects of refraction and reflection over long-range paths are included. The derived directional noise field is expressed as a function of vertical arrival angle, with the parameters being velocity profile, surface ...
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Ambient noise data logger buoy
IEEE Journal of Oceanic Engineering, 1990A buoy for measuring wind speed and the ambient noise sound pressure level from 10 to 1500 Hz with 1-Hz resolution is described. The measurement buoy was deployed in a remote fjord in southeastern Alaska from October to December, 1989. The results from the data collected show that, for a wind speed of 5 kn, the measured ambient noise level at 900 Hz ...
D.E. Hollinberger, D.W. Bruder
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Remote sensing with ambient noise
SEG Technical Program Expanded Abstracts 2009, 2009Ambient noise is ubiquitous in the ocean. For many years, this noise has been considered the unwanted part of the acoustic signal. However, recent studies have shown that the noise itself contains valuable information about properties of the ocean, Earth, and atmosphere. For example, distant storms have been observed using measurements of low-frequency
Peter Gerstoft, Martin Siderius
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Lagrangian ambient noise drifter
Proceedings of OCEANS'94, 2002The Defence Research Establishment Atlantic has carried out an experiment to study the relationship between ambient noise and oceanographic features in regions of pronounced oceanic currents, such as the Gulf Stream or its eddies, using a field of purpose built, long life drifting buoys developed and maintained at sea by Seimac Limited, of Dartmouth ...
W.C. Risley, I.A. Fraser, G.T. Leger
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The Journal of the Acoustical Society of America, 2001
Ambient Noise (AN) research during World War II was facilitated by the availability of calibrated instruments and motivated by the necessity to understand AN levels in coastal waters. The state-of-the-art was reviewed by Knudsen in 1948 and later by Pryce and Urick in 1954.
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Ambient Noise (AN) research during World War II was facilitated by the availability of calibrated instruments and motivated by the necessity to understand AN levels in coastal waters. The state-of-the-art was reviewed by Knudsen in 1948 and later by Pryce and Urick in 1954.
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IEEE Transactions on Signal Processing, 1993
Signal processing algorithms optimized for Gaussian noise may degrade significantly in a non-Gaussian noise environment. Therefore it is important to characterize the noise accurately before including its structure in the formulation of algorithms. A generic distribution suitable for modeling non-Gaussian ambient noise in the kurtosis range 1.8 >
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Signal processing algorithms optimized for Gaussian noise may degrade significantly in a non-Gaussian noise environment. Therefore it is important to characterize the noise accurately before including its structure in the formulation of algorithms. A generic distribution suitable for modeling non-Gaussian ambient noise in the kurtosis range 1.8 >
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Physics Today, 2010
Whether noise is a nuisance or a signal depends on how it’s processed. By cross-correlating noise recorded at two sensors, researchers can retrieve the waves that propagate between them and extract details about the intervening medium.
Roel Snieder, Kees Wapenaar
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Whether noise is a nuisance or a signal depends on how it’s processed. By cross-correlating noise recorded at two sensors, researchers can retrieve the waves that propagate between them and extract details about the intervening medium.
Roel Snieder, Kees Wapenaar
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Passive Imaging with Ambient Noise
2016Waves generated by opportunistic or ambient noise sources and recorded by passive sensor arrays can be used to image the medium through which they travel. Spectacular results have been obtained in seismic interferometry, which open up new perspectives in acoustics, electromagnetics, and optics.
Garnier, Josselin, Papanicolaou, G.
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The Journal of the Acoustical Society of America, 1964
Directional, spectral, and statistical properties of the under-ice noise in the arctic are presented. The measurements were made during a 15-day period on an ice floe in the Beaufort Basin in April 1963.
Charles R. Greene, Beaumont M. Buck
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Directional, spectral, and statistical properties of the under-ice noise in the arctic are presented. The measurements were made during a 15-day period on an ice floe in the Beaufort Basin in April 1963.
Charles R. Greene, Beaumont M. Buck
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1988
Mechanisms affecting ice floe interactions in the marginal ice zone (MIZ) are discussed. These mechanisms are assumed to be the major forcing functions driving the ambient noise levels in the MIZ. Results from previous studies are briefly summarized with hypotheses presented concerning the effect of ice eddies and grease ice on ambient noise.
Ola M. Johannessen +4 more
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Mechanisms affecting ice floe interactions in the marginal ice zone (MIZ) are discussed. These mechanisms are assumed to be the major forcing functions driving the ambient noise levels in the MIZ. Results from previous studies are briefly summarized with hypotheses presented concerning the effect of ice eddies and grease ice on ambient noise.
Ola M. Johannessen +4 more
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