High sea state ambient noise near Bermuda

1986 ◽  
Vol 80 (S1) ◽  
pp. S65-S65
Author(s):  
A. Donn Cobb ◽  
William A. Von Winkle ◽  
David G. Browning
Keyword(s):  
Ambient Noise ◽  
Sea State

ANALYSIS OF FLUCTUATIONS IN WIND DEPENDENT SHALLOW WATER AMBIENT NOISE SPECTRUM

2007 ◽  
Vol 07 (03) ◽  
pp. L313-L319 ◽  
Author(s):  
S. RAMJI ◽  
G. LATHA ◽  
S. RAMAKRISHANAN
Keyword(s):  
Shallow Water ◽  
Frequency Band ◽  
Noise Level ◽  
Ambient Noise ◽  
Low Frequency ◽  
Noise Spectrum ◽  
Sea State ◽  
Spectrum Level ◽  
Frequency Bands ◽  
Lower Frequency Band

In this work, the fluctuations in the spectrum level of shallow water ambient noise is analyzed for 3 different sea states. The shallow water ambient noise data were collected of Bay of Bengal using an omni directional hydrophone and a portable data acquisition system.100 sets of data were collected and organized according to the three different sea states using Beaufort scale. Fluctuations in noise spectrum level at different sea states were studied by dividing the spectral bandwidth of 12 kHz into low, mid and high frequency bands. Mean noise spectrum level for each sea state was calculated and the result shows the noise spectrum level increases with the sea state. Further it was found that the noise level was higher in lower frequency band and decreases in the higher frequency band. Also the correlation between the noise level and sea state was higher in the low frequency band and tend to decrease in the mid frequency band and there was no correlation in the higher frequency bands. The higher noise levels were associated with lower frequencies of the bandwidth whereas it is less in higher frequencies. The fluctuations were found to be higher in the lower frequency band than the mid and higher frequency band. In this paper the data collection, data processing and noise spectrum analysis are presented in detail. As the fluctuations in power spectrum level of the ambient noise is one of the primary factor which decides the signal to noise ratio of most of the acoustic instruments, these results seems to be significant.

Analysis and Modeling of Ambient Noise in Shallow Water of Arabian Sea

2012 ◽  
Vol 2 (6) ◽  
pp. 271-272
Author(s):  
Sudhir Pal Singh Rawat ◽  
◽  
Dr. Arnab Das ◽  
Dr. H.G.Virani Dr. H.G.Virani ◽  
Dr. Y.K.Somayajulu Dr. Y.K.Somayajulu
Keyword(s):  
Shallow Water ◽  
Arabian Sea ◽  
Ambient Noise

Calculation of magnetic flow noise inside an enclosure in a sea-state

1998 ◽  
Author(s):  
Mark Hyman ◽  
Iskender Sahin ◽  
Thai Nguyen
Keyword(s):  
Sea State ◽  
Magnetic Flow ◽  
Flow Noise

Particularities of tinnitus in children and adolescents

ORL ro ◽  
2016 ◽  
Vol 4 (1) ◽  
pp. 40-42
Author(s):  
Alexandra Boloș ◽  
Sebastian Cozma ◽  
Andreea Silvana Szalontay
Keyword(s):  
Quality Of Life ◽  
Young Adults ◽  
Children And Adolescents ◽  
Psychological Factors ◽  
Ambient Noise ◽  
Psychological Consequences ◽  
Therapeutic Approaches

Tinnitus is a common otologic symptom and probably the most troublesome. Tinnitus causes a number of physical and psychological consequences, that interfere with the quality of life of the patient. Many authors believe that the presence of tinnitus in children is a matter of lesser importance than in adults because it is met less frequently and would be a fleeting symptom, inoffensive for them (Graham, 1981). In addition, the prevalence of tinnitus during adolescence and even in young adults is increasing, possibly as a consequence of the increased ambient noise (Bulbul SF, Shargorodsky J). Various therapeutic approaches have generated different results, which led us to consider the role of psychological factors, hence the need to underline the particularities of this symptom in childhood.  

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