Results 121 to 130 of about 66,725 (166)
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The Journal of the Acoustical Society of America, 2017
The Arctic Ocean is undergoing dramatic changes, with the most apparent being the rapidly reducing extent and thickness of the summer ice cover. Furthermore, a persistent inflow of a shallow tongue of warm Pacific water has recently been discovered in the Beaufort Sea region of the Arctic, often called the Beaufort Lens, which creates a strong acoustic
Andrew J. Poulsen, Henrik Schmidt
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The Arctic Ocean is undergoing dramatic changes, with the most apparent being the rapidly reducing extent and thickness of the summer ice cover. Furthermore, a persistent inflow of a shallow tongue of warm Pacific water has recently been discovered in the Beaufort Sea region of the Arctic, often called the Beaufort Lens, which creates a strong acoustic
Andrew J. Poulsen, Henrik Schmidt
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Ambient-Noise Directivity Measurements
The Journal of the Acoustical Society of America, 1964Measurements have been made from which the vertical directivity of ambient sea noise near the ocean bottom in water 14 500 ft deep has been computed. A vertical linear array of 40 hydrophones was used, with delay lines, to form 28 beams in directions from horizontal to vertically upward.
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Ambient noise bathymetric domains
The Journal of the Acoustical Society of America, 2011For the purposes of describing and understanding ambient sea noise for frequencies below about 300 Hz, most of the world's seas can be classified as belonging to one of three bathymetric domains. These domains are distinguished by their proximity to shipping lanes and by the degree to which they are exposed to noises originating at long distances.
Donald Ross +3 more
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Ambient noise suppression circuit
The Journal of the Acoustical Society of America, 1999An ambient noise suppression electrical circuit to be used with a voice communication terminal comprising a gain control amplifier, whose input is a microphone, and a peak-hold circuit that includes a band-pass amplifier that amplifies a specified frequency range of the output signals of the microphone, a peak detection circuit that produces signals in
Noboru Yamaguchi, Masao Konomi
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The Journal of the Acoustical Society of America, 1989
Ambient noise data along with oceanographic, meteorological, and remote sensing data were collected during the Marginal Ice Zone Experiment in March and April 1987 in the Greenland Sea. The experiment was designed to study how ambient noise was generated by ice kinematics, ice edge eddies, and wave propagation into the ice pack. Sonobuoys were deployed
Ola M. Johannessen +4 more
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Ambient noise data along with oceanographic, meteorological, and remote sensing data were collected during the Marginal Ice Zone Experiment in March and April 1987 in the Greenland Sea. The experiment was designed to study how ambient noise was generated by ice kinematics, ice edge eddies, and wave propagation into the ice pack. Sonobuoys were deployed
Ola M. Johannessen +4 more
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The Journal of the Acoustical Society of America, 1978
ANS has been designed and developed by NUWES as a permanently installed system for the collection, recording, and processing of underwater ambient noise data for support of underwater weapon proofing operations. This system, now operational, is located at the three dimensional (3-D) tracking range located at Nanoose, British Columbia, Canada.
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ANS has been designed and developed by NUWES as a permanently installed system for the collection, recording, and processing of underwater ambient noise data for support of underwater weapon proofing operations. This system, now operational, is located at the three dimensional (3-D) tracking range located at Nanoose, British Columbia, Canada.
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Intrusive Noise and the Ambient Noise Environment
The Journal of the Acoustical Society of America, 1970The extent to which an intruding noise source penetrates the general ambient noise environment in a community, serves as a useful indicator of the likely reaction of the community to that noise source. Available techniques using this approach generally provide a measure of community response based upon the absolute difference in level between the ...
R. J. Sawley, C. G. Gordon
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Seismic, Ambient Noise Correlation
2011No abstract.
Campillo, Michel +2 more
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The Journal of the Acoustical Society of America, 1965
Measurements of the space-time crosscorrelation of ambient sea noise were made with pairs of hydrophones, separated vertically between 2–40 ft, at a depth of 14 500 ft, in the frequency range from 100 to 1200 cps. Previous results at sea state 5 [J. Acoust. Soc. Am. 38, 146–148(L) (1965)] were extended and now include lower sea states.
Elizabeth M. Arase, T. Arase
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Measurements of the space-time crosscorrelation of ambient sea noise were made with pairs of hydrophones, separated vertically between 2–40 ft, at a depth of 14 500 ft, in the frequency range from 100 to 1200 cps. Previous results at sea state 5 [J. Acoust. Soc. Am. 38, 146–148(L) (1965)] were extended and now include lower sea states.
Elizabeth M. Arase, T. Arase
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1967
Abstract : The objective of this report is to provide information on deep ocean ambient noise which can be used in sonar system design and analysis. Guidelines are given for estimating wind-generated noise, oceanic ship traffic noise, biological noise levels, and the composite ambient noise background.
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Abstract : The objective of this report is to provide information on deep ocean ambient noise which can be used in sonar system design and analysis. Guidelines are given for estimating wind-generated noise, oceanic ship traffic noise, biological noise levels, and the composite ambient noise background.
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