Variability of sound field interference patterns in horizontal plane and estimation of horizontal refraction angle

2012 ◽  
Author(s):  
Mohsen Badiey ◽  
Boris Katsnelson ◽  
Andrey Malikhin
Keyword(s):  
Horizontal Plane ◽  
Sound Field ◽  
Refraction Angle ◽  
Horizontal Refraction

scholarly journals Dynamic sound field audiometry: Static and dynamic spatial hearing tests in the full horizontal plane

2020 ◽  
Vol 166 ◽  
pp. 107363 ◽  
Author(s):  
Fischer T. ◽  
Kompis M. ◽  
Mantokoudis G. ◽  
Caversaccio M. ◽  
Wimmer W.
Keyword(s):  
Horizontal Plane ◽  
Sound Field ◽  
Spatial Hearing ◽  
Hearing Tests

Space-time sound field interference in the horizontal plane in a coastal slope region

2012 ◽  
Vol 58 (3) ◽  
pp. 301-307 ◽  
Author(s):  
B. G. Katsnel’son ◽  
A. Yu. Malykhin
Keyword(s):  
Horizontal Plane ◽  
Sound Field ◽  
Space Time ◽  
Coastal Slope

scholarly journals Three-Dimensional Sound Propagation in the South China Sea with the Presence of Seamount

2021 ◽  
Vol 9 (10) ◽  
pp. 1078
Author(s):  
Shenghao Li ◽  
Zhenglin Li ◽  
Wen Li ◽  
Yanxin Yu
Keyword(s):  
South China Sea ◽  
South China ◽  
Sound Propagation ◽  
Three Dimensional ◽  
Sound Field ◽  
The South China Sea ◽  
China Sea ◽  
3D Effects ◽  
Horizontal Refraction ◽  
2D And 3D

Seamounts have important effects on sound propagation in deep water. A sound propagation experiment was conducted in the South China Sea in 2016. The three-dimensional (3D) effects of a seamount on sound propagation are observed in different propagation tracks. Ray methods (BELLHOP N×2D and 3D models) are used to analyze and explain the phenomena. The results show that 3D effects have obvious impacts on a sound field within a horizontal refraction zone behind the seamount because some sound beams cannot reach the receiver for the horizontal refraction effects, which impacts the sound field within a certain angle range behind the seamount. The arrival structure results show that the eigenrays after horizontal reflection will arrive at the receiver earlier than those obtained from the two-dimensional (2D) model within the horizontal refraction zone behind the seamount. This means that the horizontal reflection effect of a seamount will cause the shortening of sound propagation paths. Finally, in the reflection zone in front of the seamount, the 2D and 3D TL results show that the shape of the reflection zone is similar to an “arch” type, and the horizontal refraction of sound waves has little effect on the TLs in the reflection zone of a seamount.

The Influence of Early Sound Direction on Apparent Source Width (ASW)

2013 ◽  
Vol 357-360 ◽  
pp. 160-163 ◽  
Author(s):  
Xiong Yan
Keyword(s):  
Horizontal Plane ◽  
Objective Measure ◽  
Sound Field ◽  
Spatial Effects ◽  
Arrival Direction ◽  
Energy Fraction ◽  
Sound Direction ◽  
Apparent Source ◽  
Concert Halls ◽  
Straight Ahead

t is now generally accepted that there are two spatial effects in concert halls: apparent source width (ASW) and listener envelopment (LEV). Barron have proposed the early lateral sound energy fraction (LFE) as an objective measure for apparent source width. But this measure takes no account of asymmetry role between the early sounds from front and behind. The purpose of this study is to investigate the relation between the arrival direction of early sound and ASW. Experiments using sound field simulated in an anechoic room confirm that early-arriving sound from in front of listener give more contribution to ASW than symmetrical direction behind listener. As the direction of arrival approaches between 45o to 60o from straight ahead in the horizontal plane the ASW approaches a maximum.

Decay of Temporary Threshold Shift in Noise

1973 ◽  
Vol 16 (2) ◽  
pp. 267-270 ◽  
Author(s):  
John H. Mills ◽  
Seija A. Talo ◽  
Gloria S. Gordon
Keyword(s):  
Sound Field ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Octave Band ◽  
Band Noise ◽  
Lower Asymptote

Groups of monaural chinchillas trained in behavioral audiometry were exposed in a diffuse sound field to an octave-band noise centered at 4.0 k Hz. The growth of temporary threshold shift (TTS) at 5.7 k Hz from zero to an asymptote (TTS ∞ ) required about 24 hours, and the growth of TTS at 5.7 k Hz from an asymptote to a higher asymptote, about 12–24 hours. TTS ∞ can be described by the equation TTS ∞ = 1.6(SPL-A) where A = 47. These results are consistent with those previously reported in this journal by Carder and Miller and Mills and Talo. Whereas the decay of TTS ∞ to zero required about three days, the decay of TTS ∞ to a lower TTS ∞ required about three to seven days. The decay of TTS ∞ in noise, therefore, appears to require slightly more time than the decay of TTS ∞ in the quiet. However, for a given level of noise, the magnitude of TTS ∞ is the same regardless of whether the TTS asymptote is approached from zero, from a lower asymptote, or from a higher asymptote.

Modified Earpieces and CROS for High Frequency Hearing Losses

1968 ◽  
Vol 11 (1) ◽  
pp. 204-218 ◽  
Author(s):  
Elizabeth Dodds ◽  
Earl Harford
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
High Frequency ◽  
Hearing Aid ◽  
Sound Field ◽  
Intensity Level ◽  
Test Results ◽  
High Frequency Hearing Loss ◽  
Increased Sensitivity ◽  
Difficult Cases

Persons with a high frequency hearing loss are difficult cases for whom to find suitable amplification. We have experienced some success with this problem in our Hearing Clinics using a specially designed earmold with a hearing aid. Thirty-five cases with high frequency hearing losses were selected from our clinical files for analysis of test results using standard, vented, and open earpieces. A statistical analysis of test results revealed that PB scores in sound field, using an average conversational intensity level (70 dB SPL), were enhanced when utilizing any one of the three earmolds. This result was due undoubtedly to increased sensitivity provided by the hearing aid. Only the open earmold used with a CROS hearing aid resulted in a significant improvement in discrimination when compared with the group’s unaided PB score under earphones or when comparing inter-earmold scores. These findings suggest that the inclusion of the open earmold with a CROS aid in the audiologist’s armamentarium should increase his flexibility in selecting hearing aids for persons with a high frequency hearing loss.

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