Broad Frequency Selectivity at High Sound Pressure Levels is Important for Speech Coding in the Cochlear Nucleus

1992 ◽  
pp. 781-781
Author(s):  
S. Greenberg ◽  
W. S. Rhode
Keyword(s):  
Cochlear Nucleus ◽  
Sound Pressure ◽  
Speech Coding ◽  
Frequency Selectivity ◽  
Sound Pressure Levels ◽  
High Sound

scholarly journals Automotive traffic noise and urban public spaces

2021 ◽  
Vol 9 (72) ◽  
Author(s):  
Greicikelly Gaburro Paneto ◽  
Cristina Engel de Alvarez ◽  
Paulo Henrique Trombetta Zannin
Keyword(s):  
Urban Space ◽  
Sound Pressure ◽  
Traffic Noise ◽  
Motor Vehicles ◽  
Open Spaces ◽  
Sound Levels ◽  
Measurement Results ◽  
Sound Pressure Levels ◽  
High Sound

In contemporary cities, and usually without realizing it, the population has been exposed to high sound pressure levels, which besides causing discomfort, can lead to health problems. Considering that a large part of this noise comes from emission from motor vehicles, this research aims to evaluate the sound behavior in sound environments configured by voids in the urban fabric, in order to identify whether open spaces can act as attenuators of sound levels. To obtain the expected results, the methodology used was structured from a review of the state-of-the-art and computer simulations relating the variables that influence the formation of urban space and sound emission and propagation, taking as a case study an urban portion of the municipality of Vitória/ES. In parallel, questionnaires were applied to evaluate the user's perception of their exposure. The measurement results indicated that the sound pressure levels caused by traffic noise are above the limit tolerated limit by the NBR norm 10151:2000 for the daytime period. In turn, the results obtained from the population indicated that there is little perception of noise by the users of the spaces surveyed.

Simple Triangular Approximations of Auditory Filter Shapes

1990 ◽  
Vol 33 (3) ◽  
pp. 530-539 ◽  
Author(s):  
C. Formby
Keyword(s):  
Sound Pressure ◽  
Frequency Selectivity ◽  
Complex Nature ◽  
Qualitative Properties ◽  
Shape Model ◽  
Filter Model ◽  
Auditory Filter ◽  
Simplified Method ◽  
Clinical Measurements ◽  
High Sound

At present, the most popular auditory filter shape model is one with a rounded peak and exponentially decaying filter skirts (Patterson & Moore, 1986). Unfortunately, the complex nature of this “roex” filter model may, in some instances, have hindered the application of the auditory filter shape in clinical measurements of frequency selectivity. Moreover, some of the assumptions of the roex filter model may be violated at high sound-pressure levels (SPLs) and this limitation has also been a factor when considering the roex auditory filter shape in the clinic. Our purpose is to introduce a simplified method that is adequate for obtaining clinically useful estimates of triangular-shaped auditory filters. Although the triangular-shaped filter model faces the same problems as the roex model at high SPLs, the calculations and assumptions underlying the former are far less complicated. The triangular filter model also retains many of the qualitative properties and advantages afforded by roex-fitted auditory filter shapes. In this report, we review the basic concepts underlying auditory filter shape estimates and describe our methods for measuring and fitting the triangular-shaped filter model. We then present normative triangular filter shapes and compare these estimates with auditory filter shapes fitted by other means. Finally, we present selected examples of triangular filter shapes fitted to the masked thresholds of hearing-impaired patients. For the most part, the triangular-shaped filter model offers the clinician a satisfactory compromise for obtaining estimates of auditory filter shape and frequency selectivity at moderately intense and high SPLs.

Acoustic Resistance of an Orifice at High Sound Pressure Levels

2018 ◽  
Vol 64 (5) ◽  
pp. 563-566 ◽  
Author(s):  
A. I. Komkin ◽  
A. I. Bykov ◽  
M. A. Mironov
Keyword(s):  
Sound Pressure ◽  
Sound Pressure Levels ◽  
Acoustic Resistance ◽  
High Sound

scholarly journals Environmental ultrasound in laboratories and animal houses: a possible cause for concern in the welfare and use of laboratory animals

1988 ◽  
Vol 22 (4) ◽  
pp. 369-375 ◽  
Author(s):  
G. D. Sales ◽  
K. J. Wilson ◽  
K. E. V. Spencer ◽  
S. R. Milligan
Keyword(s):  
Sound Pressure ◽  
Visual Display ◽  
Laboratory Animals ◽  
Upper Limit ◽  
Sound Pressure Levels ◽  
Hearing Range ◽  
Human Hearing ◽  
High Sound ◽  
Possible Cause

Many laboratory animals are known to be sensitive to sounds (ultrasounds) beyond the nominal upper limit (20 kHz) of the human hearing range. Sources of sound in laboratories and animal houses were examined to determine the extent of ambient ultrasound. Of 39 sources monitored, 24 were found to emit ultrasonic sounds. Many of these (e.g. cage washers and hoses) also produced sound in the audible range. Running taps, squeaky chairs and rotating glass stoppers created particularly high sound pressure levels and contained frequencies to over 100 kHz. The oscilloscopes and visual display units investigated provided particular cause for concern as they emitted sounds that were entirely ultrasonic and therefore were apparently silent. Ambient ultrasound therefore appears to be common in laboratories and animal houses. It is suggested that its effect on laboratory animals should be investigated and guidelines on acceptable levels be formulated.

scholarly journals Sound absorption of porous metals at high sound pressure levels

2009 ◽  
Vol 126 (2) ◽  
pp. EL55-EL61 ◽  
Author(s):  
Xiaolin Wang ◽  
Feng Peng ◽  
Baojun Chang
Keyword(s):  
Sound Absorption ◽  
Sound Pressure ◽  
Porous Metals ◽  
Sound Pressure Levels ◽  
High Sound
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