Contribution of non‐verbal and non‐ventilation noise sources to background noise levels in elementary school classrooms.

2011 ◽  
Vol 129 (4) ◽  
pp. 2523-2523
Author(s):  
Alex Hornecker ◽  
Clothilde Giacomoni ◽  
Michelle C. Vigeant ◽  
Robert D. Celmer
Keyword(s):  
Elementary School ◽  
Background Noise ◽  
Noise Levels ◽  
Noise Sources

Acoustic contributions and characteristics of floor treatments for elementary school classroom background noise levels

2012 ◽  
Vol 132 (3) ◽  
pp. 2072-2072
Author(s):  
Robert Celmer ◽  
Clothilde Giacomoni ◽  
Alex Hornecker ◽  
Ari M. Lesser ◽  
Adam P. Wells ◽  
...  
Keyword(s):  
Elementary School ◽  
Background Noise ◽  
Noise Levels ◽  
School Classroom

scholarly journals Characterization of Noise Level Inside a Vehicle under Different Conditions

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2471 ◽  
Author(s):  
Daniel Flor ◽  
Danilo Pena ◽  
Luan Pena ◽  
Vicente A. de Sousa ◽  
Allan Martins
Keyword(s):  
Regression Analysis ◽  
Noise Level ◽  
Acoustic Noise ◽  
Experimental Setup ◽  
Strongly Correlated ◽  
Noise Levels ◽  
Noise Sources ◽  
Statistical Tools ◽  
Window Position

Vehicular acoustic noise evaluations are a concern of researchers due to health and comfort effects on humans and are fundamental for anyone interested in mitigating audio noise. This paper focuses on the evaluation of the noise level inside a vehicle by using statistical tools. First, an experimental setup was developed with microphones and a microcomputer located strategically on the car’s panel, and measurements were carried out with different conditions such as car window position, rain, traffic, and car speed. Regression analysis was performed to evaluate the similarity of the noise level from those conditions. Thus, we were able to discuss the relevance of the variables that contribute to the noise level inside a car. Finally, our results revealed that the car speed is strongly correlated to interior noise levels, suggesting the most relevant noise sources are in the vehicle itself.

The Canterbury Child's Aid: A Binaural Spatial Sensor for Research with Blind Children

1979 ◽  
Vol 73 (5) ◽  
pp. 179-184
Author(s):  
E. R. Strelow ◽  
J. T. Boys
Keyword(s):  
Future Development ◽  
Background Noise ◽  
Field Of View ◽  
Basic Operation ◽  
Noise Levels ◽  
Design Features ◽  
Blind Children ◽  
Automatic Level

A binaural sensory aid for research with blind children is described along with the rationale for its design features. The basic operation of this form of aid is described in detail with particular reference to those features that control the sensing parameters of range, direction and field of view. A novel automatic level controller which ensures that device sounds remain audible but not excessively loud, in spite of changes in background noise levels, is also described. The likely future development of these forms of sonic aids is discussed.

scholarly journals Background noise analysis in urban airport surroundings of Brazilian cities, Congonhas Airport, São Paulo

2016 ◽  
Vol 50 (0) ◽  
Author(s):  
Fabio Scatolini ◽  
Cláudio Jorge Pinto Alves
Keyword(s):  
Traffic Control ◽  
Background Noise ◽  
Noise Analysis ◽  
Exposure Level ◽  
Noise Levels ◽  
Sound Exposure ◽  
Operational Characteristics ◽  
Data Compilation ◽  
Noise Measurements ◽  
Noise Data

ABSTRACT OBJECTIVE To perform a quantitative analysis of the background noise at Congonhas Airport surroundings based on large sampling and measurements with no interruption. METHODS Measuring sites were chosen from 62 and 72 DNL (day-night-level) noise contours, in urban sites compatible with residential use. Fifteen sites were monitored for at least 168 hours without interruption or seven consecutive days. Data compilation was based on cross-reference between noise measurements and air traffic control records, and results were validated by airport meteorological reports. Preliminary diagnoses were established using the standard NBR-13368. Background noise values were calculated based on the Sound Exposure Level (SEL). Statistic parameters were calculated in one-hour intervals. RESULTS Only four of the fifteen sites assessed presented aircraft operations as a clear cause for the noise annoyance. Even so, it is possible to detect background noise levels above regulation limits during periods of low airport activity or when it closes at night. CONCLUSIONS All the sites monitored showed background noise levels above regulation limits between 7:00 and 21:00. In the intervals between 6:00-6:59 and 21:00-22:59 the noise data, when analyzed with the current airport operational characteristics, still allow the development of additional mitigating measures.

scholarly journals Modeling and Mapping of Combined Noise Annoyance for Aircraft and Road Traffic Based on a Partial Loudness Model

2021 ◽  
Vol 18 (16) ◽  
pp. 8724
Author(s):  
Wonhee Lee ◽  
Chanil Chun ◽  
Dongwook Kim ◽  
Soogab Lee
Keyword(s):  
Background Noise ◽  
Road Traffic ◽  
Noise Source ◽  
Transportation Systems ◽  
Masking Effect ◽  
Noise Sources ◽  
Noise Annoyance ◽  
Short And Long Term ◽  
Loudness Model

Complex transportation systems often produce combined exposure to aircraft and road noise. Depending on the noise source, the annoyance response is different, and a masking effect occurs between the noise sources within the combined noise. Considering these characteristics, partial loudness was adopted to evaluate noise annoyance. First, a partial loudness model incorporating binaural inhibition was proposed and validated. Second, short- and long-term annoyance models were developed using partial loudness. Finally, the annoyance of combined noise was visualized as a map. These models can evaluate the annoyance by considering both the intensity and frequency characteristics of the noise. In addition, it is possible to quantify the masking effect that occurs between noise sources. Combined noise annoyance maps depict the degree of annoyance of residents and show the background noise effect, which is not seen on general noise maps.

Noise in an inpatient hospital ward in New Zealand

2020 ◽  
Vol 27 (4) ◽  
pp. 299-309
Author(s):  
Thomas Hulland ◽  
Andy Su ◽  
Michael Kingan
Keyword(s):  
New Zealand ◽  
Experimental Method ◽  
Total Duration ◽  
Hospital Ward ◽  
Noise Levels ◽  
Noise Sources ◽  
Inpatient Hospital

This article describes an investigation into the noise levels which patients are exposed to in a general inpatient hospital ward in New Zealand. An initial noise survey was conducted over a period of nine consecutive days in order to establish the noise levels in the ward. It was identified that noise levels increased dramatically between 4:00 a.m. and 7:00 a.m. In order to identify the sources of noise during this period, three noise surveys were undertaken between 4:30 a.m. and 7:00 a.m. on typical weekdays using a microphone placed inside a shared bedroom. During the noise survey, an observer identified the noise sources and their locations for significant noise events. Noise sources were then categorised into three main groups based on the character of the source (machine, staff or patient). Staff noise was found to account for 64% of the total duration of significant noise events (29% of the number of events) which occurred during the observations compared with 20% from patients (43% of the number of events) and 16% from machines (28% of the number of events). It was found that many staff and machine noise events could be mitigated or eliminated. Methods for mitigating noise are suggested and an experimental method was used to estimate the likely reduction in noise which could be attained by moving a staff conversation from the corridor outside the observed bedroom to other locations on the ward.

Background‐Noise Levels in Suburban Communities

1963 ◽  
Vol 35 (5) ◽  
pp. 779-780 ◽  
Author(s):  
Lewis S. Goodfriend ◽  
R. L. Cardinell ◽  
Paul B. Ostergaard ◽  
Ray Donley
Keyword(s):  
Background Noise ◽  
Noise Levels ◽  
Suburban Communities

Sparsified nightly fish chorusing in the Dry Tortugas during elevated background noise levels due to a tropical storm

2017 ◽  
Vol 141 (5) ◽  
pp. 3944-3944
Author(s):  
Benjamin S. Gottesman ◽  
Dante Francomano ◽  
Taylor Broadhead ◽  
Bryan C. Pijanowski
Keyword(s):  
Background Noise ◽  
Tropical Storm ◽  
Noise Levels ◽  
Dry Tortugas

Auditory and Visual Effects on Solutions to Computerized Mathematics Problems as a Function of Rate of Digit Presentation ,

1989 ◽  
Vol 69 (3-2) ◽  
pp. 1127-1130 ◽  
Author(s):  
William F. Vitulli ◽  
Connie P. Anderson
Keyword(s):  
Background Noise ◽  
Sound Pressure ◽  
Paired Comparison ◽  
Noise Levels ◽  
Visual Effects ◽  
Mathematics Problems ◽  
Exploratory Investigation ◽  
Significant Difference ◽  
Masking Noise ◽  
Post Hoc

This exploratory investigation concerned the effects of both auditory and visual stimulus variations on the accuracy of mental solutions to addition problems presented on a computer screen (CRT). 5 intensities of background noise and 5 background hues were presented randomly to 123 undergraduate volunteers as they mentally summed 25 numerals ranging from 1 to 5 at rates of either 1 sec. or 3 sec. per numeral timed from the onset of the previous numeral. A 2 × 2 × 5 mixed split-plot factorial analysis of variance gave a significant difference in errors between rates of digit presentation with greater accuracy associated with the 3-sec. rate. There was no significant difference in mean errors for auditory vs color modalities, yet a post hoc Newman-Keuls paired-comparison test of decibel levels at the 1-sec. rate of digit presentation gave a significant difference in mean errors between 60-dB and 70-dB sound-pressure levels (SPLs) of white masking noise. Also, a post hoc F test on differences between successive stages indicated significant differences suggesting a “learning set.” Comparisons between ‘everyday’ instances of these noise levels are made with implications for optimal computational environments.

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