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Boothless audiometry: Ambient noise considerations
The Journal of the Acoustical Society of America, 2023Ambient noise in the test environment will impact signal detection during hearing threshold measurements due to psychoacoustic masking effects. Technical standards specify the maximum permissible ambient noise levels (MPANLs) for use during audiometric testing.
Deanna K, Meinke, William Hal, Martin
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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, 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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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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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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Ambient noise in large rivers (L)
The Journal of the Acoustical Society of America, 2011This paper presents the results of hydroacoustic noise research in three large European rivers: the Danube, the Sava, and the Tisa. Noise in these rivers was observed during a period of ten years, which includes all annual variation in hydrological and meteorological conditions (flow rate, speed of flow, wind speed, etc.).
Miodrag S, Vračar, Miomir, Mijić
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Ambient Noise: Characteristics of the Noise Field
1985The variability of the wind- and traffic-generated ambient noise related to source field and transmission path is discussed with emphasis on shallow water where the small noise intercept ranges allow controlled experiments.
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Spatial filtering in ambient noise interferometry
The Journal of the Acoustical Society of America, 2014Theoretically, the empirical Green's function between a pair of receivers can be extracted from the cross correlation of the received diffuse noise. The diffuse noise condition rarely is met in the ocean and directional sources may bias the Green's function.
Olivier, Carrière +2 more
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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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GEOACOUSTIC INVERSION OF AMBIENT NOISE: A SIMPLE METHOD
Acoustical Oceanography 2001, 2002The vertical directionality of ambient noise is strongly influenced by seabed reflections. Therefore, potentially, geoacoustic parameters can be inferred by inversion of the noise. In this approach, using vertical array measurements, the reflection loss is found directly by comparing the upward- with the downward-going noise.
Harrison, C.H., Simons, D.G.
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