Sound Pressure Levels
Measurement of Sound Pressure Levels in Anechoic Chamber and a Noisy Environment Experimentally
... caused by the individual sources. When only one source is of interest, all other sources are considered as background noise [4]. Free field means propagation of sound in space without reflections [5]. This ...
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Effects of signal processing on the measurement of maximum sound pressure levels
... commercially-available sound level meters have been used to look at the maximum levels that are measured for tone bursts, half-sine pulses, ramped noise and real transient ...maximum sound ...
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Infant Sleep Machines and Hazardous Sound Pressure Levels
... output levels were measured at a distance of 30 cm, with a mean of ...to sound pressure levels that exceed occupa- tional noise limits for an 8-hour ...
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Evaluation of sound pressure levels in a pediatric intensive care unit
... There is a brazilian study from 2015 made in a PICU, that showed results similar to this one. The sound pressure levels varied between 47.70 dB (A) and 70.00dB (A), with a general average of 60.67dB ...
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Assessment of the Effects of Different Sound Pressure Levels on Distortion Product Otoacoustic Emissions (DPOAEs) in Rats
... in sound pressure levels that are higher than 4 KHz, noise exposure leads to more significant drops in DPOAE ...in sound pressure level ...
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Measuring Sound Pressure Levels during Thermoacoustic Instabilities in Large Engines: Case Study
... This paper attempts to present some registers of sound pressure levels during the operation of large diesel engines (10 MW). During these registers we have found the preparation, occurrence and ...
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Assessment of Indoor and Outdoor Noise Pollution at a University Hospital Based on Acoustic Measurements and Noise Mapping
... acceptable levels for different hospital settings, the former being the desirable level and the latter the acceptable limit for the functioning of these envi- ...the sound levels in neonatal ...
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Characterization and Impact of Low Frequency Wind Turbine Noise Emissions
... A-weighted levels of wind turbine noise are generally quite low, so as long as they are within regulatory limits, no further consideration is often given to a potential noise ...(unweighted) sound ...
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Moths are not silent, but whisper ultrasonic courtship songs
... 5. Pressure levels of sounds emitted by various moths for mating, territorial display or ...the sound pressure levels (0 dB SPL 20 Pa) at a distance of 1 cm from the moths, ...
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Assessment of Sound Levels in a Neonatal Intensive Care Unit in Tabriz, Iran
... A limitation of this study was the awaren- ess of nurses of the presence of researchers which may have affected their behavior and hence the results of this study. Therefore, future studies are recommended to hide SLM ...
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Some Statistical Aspects of Firecracker Noise
... peak sound pressure levels at a distance of some meters can exceed the limit value of 140 dB, at which hearing protection is ...peak sound pressure levels, originating from a ...
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Audio Cartography: Visual Encoding of Acoustic Parameters
... A-weighted sound pressure levels during the day in an investigation area in Hamburg, ...of sound, sound source, and logarithmic sound pressure level as significant ...
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Song Energetics of the Bladder Cicada, Cystosoma Saundersii
... An approximate yardstick for comparison between species may be obtained by estimating the power output in mW from the observed sound-pressure levels during singing and dividing this by t[r] ...
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Classification of heavy-weight floor impact sounds in multi-dwelling houses using an equal-appearing interval scale
... annoyance levels of floor impact sounds by using various expressions describing attitudes toward noise in daily ...various sound pressure levels and temporal decay rates (DR) of sounds; the ...
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Wind turbine underwater noise and marine mammals : implications of current knowledge and data needs
... at levels sufficient to impact the behavior of marine mammals and impair hearing at considerable ...ceived levels above the sound pressure thresholds for the impact zones considered here are ...
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The Influences of Individual Sensitivity, Sound Frequency, and Sound Pressure Level on Cognitive Performances of Students
... noise levels ranging from 50 to 110 dB decrease cognitive performance, while some other studies argue that noise has no effect on mental performance [18, ...claim sound improves the speed and accuracy of ...
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Echolocation call structure and intensity in five species of insectivorous bats
... known sound pressure ...rms sound pressure level of a constant-frequency sine wave of equivalent peak-to-peak amplitude, providing the measure of dB peSPL (Stapells et ...
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Building a Software for Prediction of Noise Propagation in a Complex Condition (Indoor to Outdoor)
... to sound pressure level on inner wall surface, transmission loss through the wall and leakage from the pores are performed on these ...defining sound sources inside the hall and form five for ...
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Reduction of noise transmission in The Adephi, Singapore
... two levels combine to give a resultant effect on the ears or on the sound level ...reverberant sound pressure level. The reverberant sound pressure level may completely swamp the ...
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Aerodynamic sound and self-excited vibration of circular saw with step thickness I: Comparison of dynamic characteristics between the common circular saw and the circular saw with step thickness
... Figure 7 shows the relations between the rotation speed and the overall sound pressure levels radiated from the damped circular saws.. The levels increased with an increas[r] ...
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