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Journal articles on the topic 'Equivalent sound pressure level'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Haughton, Peter M., Guy R. Lightfoot, and John C. Stevens. "Peak-to-peak equivalent sound pressure level." International Journal of Audiology 42, no. 8 (2003): 494–95. http://dx.doi.org/10.3109/14992020309081520.

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2

Corthals, Paul. "Sound Pressure Level of Running Speech: Percentile Level Statistics and Equivalent Continuous Sound Level." Folia Phoniatrica et Logopaedica 56, no. 3 (2004): 170–81. http://dx.doi.org/10.1159/000076939.

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3

Shiraishi, Kimio, and Yukihiko Kanda. "Measurements of the equivalent continuous sound pressure level and equivalent A-weighted continuous sound pressure level during conversational Japanese speech." AUDIOLOGY JAPAN 53, no. 3 (2010): 199–207. http://dx.doi.org/10.4295/audiology.53.199.

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4

Tandon, N. "Calculating equivalent continuous sound pressure levels, LAeq." Applied Acoustics 24, no. 3 (1988): 243–44. http://dx.doi.org/10.1016/0003-682x(88)90029-1.

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5

Radziszewski, Leszek, Michał Kekez, Andrzej Bąkowski, and Alžbeta Sapietova. "Modeling of acoustic pressure variability at thoroughfare." MATEC Web of Conferences 254 (2019): 02013. http://dx.doi.org/10.1051/matecconf/201925402013.

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The work presents the analysis of variability of acoustic pressure, calculated from values of equivalent sound level, recorded in monitoring station. The models of acoustic pressure variability were built in the form of regression trees and random forest. The analysis of accuracy of obtained models was carried out. These models were subsequently used for reconstruction of equivalent sound level for periods of monitoring station inactivity.

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6

Vencovsky, Vaclav, Frantisek Rund, and David Slegl. "Reference Equivalent Threshold Sound Pressure Levels for Nonaudiometric Headphones." Journal of the Audio Engineering Society 66, no. 3 (2018): 167–71. http://dx.doi.org/10.17743/jaes.2018.0009.

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7

Arlinger, S., and C. Kinnefors. "Reference Equivalent Threshold Sound Pressure Levels for Insert Earphones." International Journal of Audiology 18, no. 4 (1989): 195–98. http://dx.doi.org/10.3109/14992028909042193.

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8

Arlinger, S., and C. Kinnefors. "Reference Equivalent Threshold Sound Pressure Levels for Insert Earphones." Scandinavian Audiology 18, no. 4 (1989): 195–98. http://dx.doi.org/10.3109/01050398909042193.

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9

Ho, Cheng-Yu, Pei-Chun Li, and Shuenn-Tsong Young. "Reference equivalent threshold sound pressure levels for Apple EarPods." Journal of the Acoustical Society of America 141, no. 2 (2017): EL115—EL119. http://dx.doi.org/10.1121/1.4976110.

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10

Makarewicz, Rufin. "Moments of probability distribution of equivalent continuous A-weighted sound pressure level(LAeqT)." Journal of the Acoustical Society of Japan (E) 14, no. 1 (1993): 25–28. http://dx.doi.org/10.1250/ast.14.25.

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11

Fernández, Jesús Alba, Marcelino Ferri García, Jaime Ramis Soriano, and Juan Antonio Martínez Mora. "Statistical Study of the Instantaneous Values of Traffic Noise Sound Pressure Level." Noise & Vibration Worldwide 33, no. 8 (2002): 16–24. http://dx.doi.org/10.1260/095745602760590203.

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In environmental acoustics the knowledge of the time dependency of the sound level provides relevant information about a sound event. In this sense, it may be said that conventional sound level metres have frequently implemented programs to calculate the fractiles (percentiles) of the distribution of instantaneous sound levels; and there are several indexes to evaluate the noise pollution, based on different statistical parameters. For further analysis of sound, and to obtain the commented indexes, it is accepted that this distribution is normal or gaussian. The questions we've tried to solve

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12

Ordoñez, R., and D. Hammershøi. "Temporary Threshold Shifts from Exposures to Equal Equivalent Continuous A-weighted Sound Pressure Level." Acta Acustica united with Acustica 100, no. 3 (2014): 513–26. http://dx.doi.org/10.3813/aaa.918731.

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13

Griefahn, Barbara, Peter Bröde, and Paul Schwarzenau. "The equivalent sound pressure level—A reliable predictor for human responses to impulse noise?" Applied Acoustics 38, no. 1 (1993): 1–13. http://dx.doi.org/10.1016/0003-682x(93)90037-7.

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14

Monazzam, Mohammad Reza, Elham Karimi, Parvin Nassiri, Lobat Taghavi, and Samaneh Karbalaei. "Outdoor Noise Pollution Mapping Case Study: A District of Tehran." Fluctuation and Noise Letters 13, no. 04 (2014): 1450027. http://dx.doi.org/10.1142/s0219477514500278.

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The main objective of this study was to investigate the noise levels at different land uses of District 14 in Tehran. For this purpose, a total number of 91 sampling stations were selected. Afterwards, the equivalent sound pressure level in each station was measured at three occasions of morning (7–9 am), noon (12–3 pm), and evening (5–8 pm). Based on the conformability requirement of each land uses, noise levels was divided in three zones wherein the land uses are exposed to different noise levels was estimated. The obtained results indicated that 8.79% of 78 land uses (residential, recreatio

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15

Fedorko, Gabriel, David Heinz, Vieroslav Molnár, and Tomáš Brenner. "Use of mathematical models and computer software for analysis of traffic noise." Open Engineering 10, no. 1 (2020): 129–39. http://dx.doi.org/10.1515/eng-2020-0021.

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AbstractNoise measurement and evaluation of the existing noise situation is carried out in the vicinity of selected roads to demonstrate the need for the design of anti-noise measures or to assess the effectiveness of the measures. The selection and number of measuring points, time and intervals, the road noise measurement procedure and the measuring instruments used shall be used in accordance with the provisions of the STN ISO 1996-1 and STN ISO 1996-2 standards. During the measurement, it is also necessary to determine the microclimatic conditions of measurement, such as temperature and rel

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16

Soeta, Yoshiharu, and Ei Onogawa. "Psycho-physiological evaluations of low-level impulsive sounds produced by air conditioners." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (2021): 1186–93. http://dx.doi.org/10.3397/in-2021-1771.

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Air conditioners are widely used in buildings to maintain thermal comfort for long time. Air conditioners produce sounds during operation, and air conditioners are regarded as one of the main noise sources in buildings. Most sounds produced by the air conditioner do not fluctuate over time and sound quality of the steady sounds produced by the air conditioner have been evaluated. However, air conditioners sometimes produce low-level and impulsive sounds. Customers criticizes such sounds are annoying when they sleep and they spend time quietly in the living room. The aim of this study was to de

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17

Kumar, Anil, Sagar Claire, Jatin Khanna, Nikhil Dhadwal, Nakul Ninama, and Ashok Kumar Bagha. "Experimental study to measure the sound transmission loss and equivalent continuous sound pressure level of composite material for various disturbances." Materials Today: Proceedings 27 (2020): 2782–86. http://dx.doi.org/10.1016/j.matpr.2019.12.199.

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18

Kekez, Michał. "Application of selected computational intelligence methods to sound level modelling based on traffic intensity in thoroughfare." MATEC Web of Conferences 254 (2019): 02038. http://dx.doi.org/10.1051/matecconf/201925402038.

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The aim of the paper was to build the models of sound pressure level as a function of traffic intensity in thoroughfare. The models were built by using artificial analytical models or regression trees. The former included Nordic Prediction Method. The latter were represented by Random Forest and Cubist. The analysis of accuracy of all obtained models was conducted. The best models can be used in the process of reconstruction of equivalent sound level data.

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19

Makino, Yusuke, and Yasushi Takano. "Effect of sound source movement at low Mach number on radiated noise level." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (2021): 3731–37. http://dx.doi.org/10.3397/in-2021-2503.

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Change in A-weighted sound pressure level or Noise level of radiated sound due to sound sources moving at low Mach number at the same speed along a straight track is discussed in this paper. When a sound source move, frequency and amplitude modulation is observed in the radiated sound field. Without their modulation, the noise level at a receiving point is determined only by distance and A-weighted sound power level of each sources. Solution of modulated frequency and amplitude of radiated sound can be obtained by using the Duhamel's efficient calculation. The modulated frequency and amplitude

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20

Bug, Marion U., and Thomas Fedtke. "Equivalent threshold sound pressure levels (ETSPLs) for RadioEar DD65v2 circumaural audiometric headphones." International Journal of Audiology 59, no. 8 (2020): 624–30. http://dx.doi.org/10.1080/14992027.2020.1727034.

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21

Claaßen, Eike, Stephan Töpken, and Steven van de Par. "Loudness- and preference-equivalent levels of fan sounds at different absolute levels." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (2021): 2304–12. http://dx.doi.org/10.3397/in-2021-2100.

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In daily life, fans are a common and often unwanted noise source. The sound pressure level in dB(A) is often not sufficient to characterize their unpleasantness and level adjustments would be needed to compensate this shortcoming. In this study, listening experiments were conducted to determine loudness- and preference-equivalent levels of 19 different fan noise stimuli. For this purpose, the level of each stimulus was varied with an adaptive procedure until it was equally loud (loudness task), or equally preferred (preference task) as a common reference noise with a fixed level of 75 dB(A). T

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22

Pšenka, Martin, Štefan Mihina, Matti Järvi, Marie Šístková, Viera Kažimírová, and Tomas Holota. "Noise Analysis at Different Technological Solutions of Milking Devices." Applied Engineering in Agriculture 34, no. 6 (2018): 921–27. http://dx.doi.org/10.13031/aea.12717.

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Abstract. The aim of this article is to evaluate the noise levels of different milking systems. Noise was measured at 15 dairy farms in Slovakia, Finland, and the Czech Republic. Out of these, there were three herringbone, three tandem, three side-by-side, and three rotary milking parlors, and three automatic milking systems (AMS). Brüel&amp;Kjær type 2270 sound analyser was used for measuring noise levels. Equivalent sound pressure level (LAeq), maximum sound pressure level (LAFmax), and peak values (LCPk) have been recorded in each milking system during the entire herd milking session. K

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23

Navarro, Juan M., Raquel Martínez-España, Andrés Bueno-Crespo, Ramón Martínez, and José M. Cecilia. "Sound Levels Forecasting in an Acoustic Sensor Network Using a Deep Neural Network." Sensors 20, no. 3 (2020): 903. http://dx.doi.org/10.3390/s20030903.

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Wireless acoustic sensor networks are nowadays an essential tool for noise pollution monitoring and managing in cities. The increased computing capacity of the nodes that create the network is allowing the addition of processing algorithms and artificial intelligence that provide more information about the sound sources and environment, e.g., detect sound events or calculate loudness. Several models to predict sound pressure levels in cities are available, mainly road, railway and aerial traffic noise. However, these models are mostly based in auxiliary data, e.g., vehicles flow or street geom

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24

Furihata, Kenji, and Takesaburo Yanagisawa. "“Hues” sound level meter based on noise-rating scale composed of five-hue scale and equivalent continuous a-weighted sound pressure level and its usefulness." Electronics and Communications in Japan (Part III: Fundamental Electronic Science) 78, no. 10 (1995): 1–9. http://dx.doi.org/10.1002/ecjc.4430781001.

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25

Jin, Tao, Qi Huang, Yong Ding, and Li Feng Zhu. "Measurement and Analysis of the Structural Noise of Urban Bridges." Applied Mechanics and Materials 548-549 (April 2014): 1623–26. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1623.

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To explore the noise generated by bridges during operational period, the equivalent continuous sound pressure levels of 12 bridges in the city of Ningbo were measured and analyzed. The measured data show that (1) Although the measured sound levels of these bridges meet the requirement of Chinese codes, they are near the maximum limit and the vibration and noise reduction is necessary; (2) A-weighted sound level of bridge is close to that of the road nearby; (3) Z-weighted sound level of bridge is much greater than that of the road nearby, it indicates that the bridge noise contains much low fr

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26

Kuwano, Sonoko, and Seiichiro Namba. "Application of loudness level to temporally varying sounds." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (2021): 140–51. http://dx.doi.org/10.3397/in-2021-1304.

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Most of the environmental noises are temporally varying and include various frequency components. Various methods for evaluating the environmental noises have been proposed. Among them, the method for calculating loudness level was first standardized in 1975 as ISO 532, including Stevens' and Zwicker's methods. Unfortunately, these methods can only be applied to steady state sounds. On the other hand, Aeq (Equivalent Continuous A-weight Sound Pressure Level) is standardized for the evaluation of level fluctuating environmental sounds as ISO 1996. In , the energy mean and A-weighting are used f

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27

Yoshida, Takumasa. "Estimation of equivalent sound pressure levels of community noise and road traffic noise." Journal of the Acoustical Society of Japan (E) 15, no. 1 (1994): 53–57. http://dx.doi.org/10.1250/ast.15.53.

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28

Hasegawa, Hiroshi, Hirotaka Ono, Takumi Ito, Ichiro Yuyama, Masao Kasuga, and Miyoshi Ayama. "Relationship between a visual stimulus with a feeling of depth and its equivalent sound pressure level (ESPL)." Journal of the Acoustical Society of America 123, no. 5 (2008): 3717. http://dx.doi.org/10.1121/1.2935165.

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29

Šístková, Marie, Martin Pšenka, Ivo Celjak, Petr Bartoš, Štefan Mihina, and Ivan Pavlík. "Noise Emissions in Milking Parlours with Various Construction Solutions." Acta Technologica Agriculturae 19, no. 2 (2016): 49–51. http://dx.doi.org/10.1515/ata-2016-0011.

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Abstract Mechanical devices in parlours are a source of noise, and this noise has an effect not only on the operators of the parlour but also on dairy cows. They have more sensitive hearing than humans. The aim of this article was to analyse the sound pressure level and determine the noise exposure of dairy cows at different technological solutions of milking parlours, during their day routine. In the experiment, tandem, herringbone and rotary milking parlours were used. Noise exposure was measured during the milking process. After evaluation of noise pressure levels of different types of milk

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30

Mlynski, Rafal, and Emil Kozlowski. "Selection of Level-Dependent Hearing Protectors for Use in An Indoor Shooting Range." International Journal of Environmental Research and Public Health 16, no. 13 (2019): 2266. http://dx.doi.org/10.3390/ijerph16132266.

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The high sound pressure level generated by impulse noise produced in an indoor shooting range makes it necessary to protect the hearing of the people it affects. Due to the need for verbal communication during training at a shooting range, level-dependent hearing protectors are useful. The objective of this study was to answer the question of whether it is possible to properly protect the hearing of a shooting instructor using level-dependent hearing protectors. The noise parameters were measured in the places where the instructor was present at the shooting range. The division of a specific g

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31

MacLean, Gail L., Andrew Stuart, and Robert Stenstrom. "Real Ear Sound Pressure Levels Developed by Three Portable Stereo System Earphones." American Journal of Audiology 1, no. 4 (1992): 52–55. http://dx.doi.org/10.1044/1059-0889.0104.52.

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Differences in real ear sound pressure levels (SPLs) with three portable stereo system (PSS) earphones (supraaural [Sony Model MDR-44], semiaural [Sony Model MDR-A15L], and insert [Sony Model MDR-E225]) were investigated. Twelve adult men served as subjects. Frequency response, high frequency average (HFA) output, peak output, peak output frequency, and overall RMS output for each PSS earphone were obtained with a probe tube microphone system (Fonix 6500 Hearing Aid Test System). Results indicated a significant difference in mean RMS outputs with nonsignificant differences in mean HFA outputs,

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32

Schlittenlacher, Josef, and Brian C. J. Moore. "Temporal integration of partial loudness of helicopter-like sounds." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4767–72. http://dx.doi.org/10.3397/in-2021-2830.

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When developing new vehicles that are to be operated in existing background noise, such as electric vertical take-off and landing aircraft (eVTOLs) in cities, a sound design goal should be to minimize the loudness in the given background noise. Rotorcraft sounds are characterised by their pulses, and the choice of rotor size and number allows to vary the temporal characteristics. We asked participants to compare the loudness of pulse trains with pulse durations of 1, 2, 5, 10 and 20 ms and a pulse rate of 20 Hz in a two-interval, two-alternatives forced choice task and a 1-up/1-down procedure.

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33

VilniÅ¡kis, Tomas, Tomas JanuÅ¡eviÄ?ius, and Pranas BaltrÄ—nas. "Case study: Evaluation of noise reduction in frequencies and sound reduction index of construction with variable noise isolation." Noise Control Engineering Journal 68, no. 3 (2020): 199–208. http://dx.doi.org/10.3397/1/376817.

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Intense sound levels produced by engineering equipment have become an acute issue. As most of engineering equipment require air supply, exhaust and good ventilation, it is not possible to control the noise by covering them with tight hoods. Louver with blades covered with acoustic materials and gaps that enable free circu- lation of air are used to this end. Three louver configurations were tested in the semi-anechoic chamber: bare metal louver blades, louver with blades covered with 20-mm-thick polystyrene foam slabs on both sides, and louver with blades covered with 15-mm-thick glass wool sl

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34

Zaman, Taylan, Abdusselam Celebi, Bengusu Mirasoglu, and Akin Savas Toklu. "The evaluation of in-chamber sound levels during hyperbaric oxygen applications: Results of 41 centres." Diving and Hyperbaric Medicine Journal 50, no. 3 (2020): 244–49. http://dx.doi.org/10.28920/dhm50.3.244-249.

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Introduction: Noise has physical and psychological effects on humans. Recommended exposure limits are exceeded in many hospital settings; however, information about sound levels in hyperbaric oxygen treatment chambers is lacking. This study measured in-chamber sound levels during treatments in Turkish hyperbaric centres. Methods: Sound levels were measured using a sound level meter (decibel meter). All chambers were multiplace with similar dimensions and shapes. Eight measurements were performed in each of 41 chambers; three during compression, three during decompression, and two at treatment

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35

Bujoreanu, Carmen, Eugen Golgoţiu, Sorinel Gicu Talif, and Gheorghe Manolache. "Experimental Investigation on Functional Parameters of the Engines Exhaust Mufflers." Applied Mechanics and Materials 822 (January 2016): 224–29. http://dx.doi.org/10.4028/www.scientific.net/amm.822.224.

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The paper presents the results obtained by investigating some functional parameters as the noise level, the pressure – drop and the temperatures of three different manufacturing solutions for mufflers. The results emphasize the corroboration between these parameters and contribute to the improvement of the muffler fabrication and design since it is a complex function that affects noise characteristics, emission and fuel efficiency of engine. It was designed a measurement chain for the noise level evaluation of the mufflers including a microphone Bruel&Kjaer type 4133, a Impulse Precision S

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36

Poulsen, Torben. "Equivalent threshold sound pressure levels (ETSPL) for Interacoustics DD 45 supra-aural audiometric earphones." International Journal of Audiology 49, no. 11 (2010): 850–55. http://dx.doi.org/10.3109/14992027.2010.500625.

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37

Nelson, David A. "Frequency resolution at equivalent sound‐pressure levels in normal‐hearing and hearing‐impaired listeners." Journal of the Acoustical Society of America 83, S1 (1988): S75. http://dx.doi.org/10.1121/1.2025509.

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38

Fujiwara, Toshiaki, Seishi Meiarashi, Yoshiharu Namikawa, and Masaki Hasebe. "Reduction of equivalent continuous A-weighted sound pressure levels by porous elastic road surfaces." Applied Acoustics 66, no. 7 (2005): 766–78. http://dx.doi.org/10.1016/j.apacoust.2004.12.004.

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39

Gibbs, Barry Marshall, and Michel Villot. "Structure-borne sound in buildings: Advances in measurement and prediction methods." Noise Control Engineering Journal 68, no. 1 (2020): 1–20. http://dx.doi.org/10.3397/1/37681.

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This article coincides with recent publications of international standards, which provide methods of predicting the performance of both heavyweight and lightweight buildings in terms of airborne sound insulation and impact sound isolation, from the performance of individual elements such as walls and floors. The performances of the elements are characterized by the sound reduction index and the impact sound pressure level. To predict the sound pressure level due to vibrating sources (i.e., mechanical installations, water services and other appliances), source data are required in a form approp

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40

Renz, Tobias, Philip Leistner, and Andreas Liebl. "Rating Level as a Method to Assess the Impact of Speech Noise on Cognitive Performance and Annoyance in Offices." Acta Acustica united with Acustica 105, no. 6 (2019): 1114–26. http://dx.doi.org/10.3813/aaa.919390.

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In Germany, the rating level is an important parameter to assess noise immissions in occupied offices. The rating level denotes the energy-equivalent sound pressure level during a measurement period with speech sounds and considers penalties for tonal, informational and impulsive constituents. There is little evidence that the rating level correlates with the performance and perceived annoyance of office workers. This study evaluates 89 different sound conditions under which subjects have to complete a short-term memory task and a questionnaire in laboratory conditions with respect to their re

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41

Carneiro Muniz, Carina Moreno Dias, Sergio Fernando Saraiva da Silva, Rachel Costa Façanha, et al. "Audiological and noise exposure findings among members of a Brazilian folklore music group." Work 68, no. 1 (2021): 235–41. http://dx.doi.org/10.3233/wor-203370.

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BACKGROUND: Musicians and dancers can be considered an at-risk population for developing noise-induced hearing loss. OBJECTIVES: To determine the audiological profile of members of a folklore-related music group and quantify noise exposure at their rehearsal venue. METHODS: This was a quantitative and descriptive study. The musicians and dancers were evaluated in two stages: an interview about their working life, followed by high frequency tonal audiometry. The sound pressure level in the group’s rehearsal venue was measured using a BEK 2270 Noise Analyzer. RESULTS: A total of 7.2% of the subj

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42

Echeverri-Londoño, Carlos Alberto, and Alice Elizabeth González Fernández. "Prediction of noise from wind turbines: theoretical and experimental study." Revista Facultad de Ingeniería Universidad de Antioquia, no. 90 (December 14, 2018): 34–41. http://dx.doi.org/10.17533/udea.redin.n90a04.

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Several noise propagation models used to calculate the noise produced by wind turbines have been reported. However, these models do not accurately predict sound pressure levels. Most of them have been developed to estimate the noise produced by industries, in which wind speeds are less than 5 m/s, and conditions favor its spread. To date, very few models can be applied to evaluate the propagation of sound from wind turbines and most of these yield inaccurate results. This study presents a comparison between noise levels that were estimated using the prediction method established in ISO 9613 Pa

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43

Feugère, Lionel, Gabriella Gibson, Nicholas C. Manoukis, and Olivier Roux. "Mosquito sound communication: are male swarms loud enough to attract females?" Journal of The Royal Society Interface 18, no. 177 (2021): 20210121. http://dx.doi.org/10.1098/rsif.2021.0121.

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Given the unsurpassed sound sensitivity of mosquitoes among arthropods and the sound source power required for long-range hearing, we investigated the distance over which female mosquitoes detect species-specific cues in the sound of station-keeping mating swarms. A common misunderstanding, that mosquitoes cannot hear at long range because their hearing organs are ‘particle-velocity’ receptors, has clouded the fact that particle velocity is an intrinsic component of sound whatever the distance to the sound source. We exposed free-flying Anopheles coluzzii females to pre-recorded sounds of male

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44

Kawasaki, M., D. Margoliash, and N. Suga. "Delay-tuned combination-sensitive neurons in the auditory cortex of the vocalizing mustached bat." Journal of Neurophysiology 59, no. 2 (1988): 623–35. http://dx.doi.org/10.1152/jn.1988.59.2.623.

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1. FM-FM neurons in the auditory cortex of the mustached bat are sensitive to a pair of frequency-modulated (FM) sounds that simulates an FM component of the orientation sound and an FM component of the echo. These neurons are tuned to particular delays between the two FM components, suggesting an encoding of target range information. The response properties of these FM-FM neurons, however, have previously been studied only with synthesized orientation sounds and echoes delivered from a loud-speaker as substitutes for the bat's own orientation sounds and corresponding echoes. In this study, th

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45

Matook, Sherry, Mary Sullivan, Amy Salisbury, Robin Miller, and Barry Lester. "Variations of NICU Sound by Location and Time of Day." Neonatal Network 29, no. 2 (2010): 87–95. http://dx.doi.org/10.1891/0730-0832.29.2.87.

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Purpose/Aims. The primary aim of this study was to identify time periods of sound levels >45 decibels (dB) in a large Level III NICU. The second aim was to determine whether there were differences in decibel levels across the five bays of the NICU, the four quadrants within each bay, and two 12-hour shifts.Design. A repeated measures design was used. Bay, quadrant, and shift were randomly selected for sampling. Staff and visitors were blinded to the location of the sound meter, which was placed in one of five identical wooden boxes and was preset to record for 12 hours.Sample. Sound levels

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46

Laly, Zacharie, Noureddine Atalla, and Sid-Ali Meslioui. "Acoustical modeling of micro-perforated panel at high sound pressure levels using equivalent fluid approach." Journal of Sound and Vibration 427 (August 2018): 134–58. http://dx.doi.org/10.1016/j.jsv.2017.09.011.

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47

Renz, Tobias, Philip Leistner, and Andreas Liebl. "Use of energy-equivalent sound pressure levels and percentile level differences to assess the impact of speech on cognitive performance and annoyance perception." Applied Acoustics 153 (October 2019): 71–77. http://dx.doi.org/10.1016/j.apacoust.2019.04.008.

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Andrzej Bąkowski and Leszek Radziszewski. "Analysis of Traffic Noise in Two Cross-Sections at the Road Crossing The City." Communications - Scientific letters of the University of Zilina 23, no. 1 (2020): B13—B21. http://dx.doi.org/10.26552/com.c.2021.1.b13-b21.

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The paper presents an analysis of the noise recorded by the two road traffic noise-monitoring stations. The stations were located in Kielce, Poland, at the road No. 74: on the outskirts of the city and near the center. Based on the experimentally recorded data, an equivalent sound level and acoustic pressure were determined for three sub-intervals of the day: nights, days and evenings. The conducted analyses showed that the average annual values (depending only on the time sub-intervals) of the median do not differ significantly between stations. A similar conclusion can be drawn based on simu

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Fanigliulo, Roberto, Lindoro Del Duca, Laura Fornaciari, Renato Grilli, Roberto Tomasome, and Danieele Pochi. "Efficiency of an ANC system in the tractor cabin under controlled engine workload." Noise Control Engineering Journal 68, no. 5 (2020): 339–57. http://dx.doi.org/10.3397/1/376829.

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The noise at the driver seat of an agricultural tractor is produced mostly by the engine. Its characteristic broadband noise spectrum varies considerably with engine workload. The passive noise control techniques adopted in tractor cabins, based on the application of sound-absorbing and sound-proofing materials, are effective against medium-high frequencies noise components. The residual noise in sound-proof cabins is characterized by tonal emissions with low frequency components (< 500 Hz) but regarded as responsible for various disorders and diseases following long-term exposure. In addit

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Shashurin, Aleksandr, Konstantiv Fiev, Viktoriia Vasilyeva, and Andrey Voronkov. "DEVELOPMENT OF THE METHODOLOGY FOR MEASURING NOISE LEVELS IN THE UNDERGROUND ROLLING STOCK." VOLUME 39, VOLUME 39 (2021): 183. http://dx.doi.org/10.36336/akustika202139183.

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This document specifies the methodology for measuring equivalent sound pressure levels in octave frequency bands (in dB rel. 20 μPa), equivalent and maximum A-corrected sound levels (in dB rel. to 20 μPa), generated in the rolling stock in the driver’s cabins and in the passenger rooms of the salons, using acoustic meters - multifunctional analyzers Ecophysics, noise and vibration meters, spectrum analyzers Ecophysics 110A, Oktava 110A Eco, Oktava 110A, Oktava 111, B&K 2250, 2250L, 2270, noise and vibration analyzers ASSISTANT, noise and vibration meters, digital spectrum analyzers Algorit

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