Ambient Noise Levels in Industrial Audiometric Test Rooms

AIHAJ ◽  
1994 ◽  
Vol 55 (5) ◽  
pp. 433-437 ◽  
Author(s):  
Tom Frank ◽  
Dennis L. Williams
Keyword(s):  
Ambient Noise ◽  
Noise Levels ◽  
Audiometric Test

scholarly journals Ambient noise levels in audiometric test rooms

1993 ◽  
Vol 93 (4) ◽  
pp. 2406-2406
Author(s):  
Tom Frank ◽  
Dennis L. Williams
Keyword(s):  
Ambient Noise ◽  
Noise Levels ◽  
Audiometric Test

ANSI Update

2000 ◽  
Vol 9 (1) ◽  
pp. 3-8 ◽  
Author(s):  
Tom Frank
Keyword(s):  
Ambient Noise ◽  
Historical Perspective ◽  
National Standards ◽  
Computational Method ◽  
Octave Band ◽  
Noise Levels ◽  
Test Room ◽  
Hearing Thresholds ◽  
Audiometric Test

The American National Standards Institute (ANSI) specifies maximum permissible ambient noise levels (MPANLs) allowed in an audiometric test room to ensure that hearing thresholds obtained down to 0-dB HL will not be elevated due to masking by ambient noise. MPANLs were originally specified in 1960 and have been revised in 1977, 1991, and most recently in 1999. The purpose of this report is to offer an overview by providing a historical perspective of the MPANLs recently specified by ANSI (ANSI S3.1-1999), the rationale for revising the MPANLs, the new computational method used for determining the 1999 MPANLs, the ANSI S3.1-1999 octave and one-third octave band MPANLs, and information concerning compliance with the new MPANLs.

Ambient Noise Levels in Audiometric Test Rooms Used for Clinical Audiometry

1993 ◽  
Vol 14 (6) ◽  
pp. 414-422 ◽  
Author(s):  
Tom Frank ◽  
Dennis L. Williams
Keyword(s):  
Ambient Noise ◽  
Noise Levels ◽  
Audiometric Test

Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms

1993 ◽  
Vol 2 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Tom Frank ◽  
John D. Durrant ◽  
Jean M. Lovrinic
Keyword(s):  
Ambient Noise ◽  
Noise Levels ◽  
Audiometric Test

The Acoustic Test Environment for Hearing Testing

2015 ◽  
Vol 26 (09) ◽  
pp. 784-791 ◽  
Author(s):  
Robert H. Margolis ◽  
Brandon Madsen
Keyword(s):  
Ambient Noise ◽  
Acoustic Measurements ◽  
Hearing Tests ◽  
Noise Levels ◽  
Test Environment ◽  
Data Collection And Analysis ◽  
The Cost ◽  
Audiometric Test ◽  
Attenuation Characteristics ◽  
Made In

Background: Audiology clinics traditionally employ expensive, prefabricated sound rooms to create an environment that is sufficiently quiet for accurate hearing tests. There is seldom any analysis of the need for or benefit from such enclosures. There may be less expensive methods that would decrease the cost of and increase access to hearing testing. Purpose: This report provides information concerning the need for and effectiveness of sound rooms and an analysis of the audiometric test ranges for various earphone/room combinations. Research Design: Acoustic measurements made in four rooms were analyzed with the attenuation provided by various earphone designs to determine the maximum permissible ambient noise levels and the corresponding audiometric test ranges. Study Sample: The measurements and calculations were performed with four test rooms and five earphone designs. Data Collection and Analysis: Ambient noise levels and earphone attenuation characteristics were used to calculate the noise levels that reach the ear. Those were compared to the maximum permissible ambient noise levels that are provided in ANSI S3.1-1999 or calculated from measured attenuation levels. These measurements were used to calculate testable ranges for each room/earphone combination. Results: The various room/earphone combinations resulted in minimum test levels that ranged from −10 to 20 dB HL at various test frequencies. Conclusions: When the actual benefits of expensive prefabricated sound rooms are assessed based on the range of hearing levels that can be tested, the effectiveness of that approach becomes highly questionable. Less expensive methods based on planning the clinic space, use of inexpensive sound treatments, and selecting an appropriate earphone can be effective in almost any space that would be used for hearing testing.

Influence of Wind-produced Noise on Orientation in the Sole (Solea solea)

1994 ◽  
Vol 51 (6) ◽  
pp. 1258-1264 ◽  
Author(s):  
J. P. Lagardère ◽  
M. L. Bégout ◽  
J. Y. Lafaye ◽  
J. P. Villotte
Keyword(s):  
Spatial Distribution ◽  
Ambient Noise ◽  
Sound Intensity ◽  
Weather Conditions ◽  
Fish Populations ◽  
Positioning System ◽  
Noise Levels ◽  
Orientation Behaviour ◽  
Solea Solea ◽  
Swimming Trajectories

Sole (Solea solea), telemetered in an enclosure using an acoustic positioning system, changed their swimming trajectories and orientation behaviour as a function of wind strength and direction. Monitoring of the spatial variation in both wind-generated currents and noise spectra in the enclosure indicates that these behavioural changes correspond to patterns in the spatial distribution of noise and to sound intensity. Thus, our observations indicate that sole perceives and reacts to horizontal variability in ambient noise levels. Such behaviour may be important in determining movements of fish populations at sea during poor weather conditions.

S254 – Bone Conduction Noise Exposure via Ventilators in the NICU

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P160-P160
Author(s):  
Angela P Black ◽  
James D Sidman
Keyword(s):  
Ambient Noise ◽  
Noise Exposure ◽  
Bone Conduction ◽  
Sound Level ◽  
Noise Levels ◽  
High Noise ◽  
Endotracheal Tubes ◽  
Level Meter ◽  
Hearing Damage ◽  
Air Conduction

Objectives To demonstrate that neonatal ventilators produce high noise levels through bone conduction (BC) via endotracheal tubes, as well as air conduction (AC) from ambient noise. Methods A sound level meter was used to measure the noise levels 4 feet from the ventilator and in direct contact at the end of a balloon attached to the ETT to simulate the noise presented to the infant. 3 commonly used neonatal ventilators (Sensormedics 3100A, VIP Bird and Bunnell Jet) were examined. Results Noise levels were significantly higher (6 – 14 dB) at the end of the ETT than 4 ft from the ventilator for all ventilators studied. Conclusions Previous studies have shown high ambient noise levels in NICUs, but have failed to address the actual noise presented to the infant. ETT transmission of noise as a direct bone stimulus through the skull has been overlooked. This study has shown that high noise intensities are being presented not only as AC, but as BC to the infants though the ETT. This study demonstrates, therefore, that ear protection alone will not save these at-risk infants from hearing damage. More must be done to decrease noise exposure and develop quieter machines.

Evaluation of Remote Categorical Loudness Scaling

2021 ◽  
pp. 1-12
Author(s):  
Judy G. Kopun ◽  
McKenna Turner ◽  
Sara E. Harris ◽  
Aryn M. Kamerer ◽  
Stephen T. Neely ◽  
...  
Keyword(s):  
Home Environment ◽  
Ambient Noise ◽  
Preliminary Evidence ◽  
Laboratory Setting ◽  
Output Level ◽  
Noise Levels ◽  
Home Setting ◽  
Adult Participants ◽  
Loudness Scaling ◽  
Remote Setting

Purpose: The aims of this study were to (a) demonstrate the feasibility of administering categorical loudness scaling (CLS) tests in a remote setting, (b) assess the reliability of remote compared with laboratory CLS results, and (c) provide preliminary evidence of the validity of remote CLS testing. Method: CLS data from 21 adult participants collected in a home setting were compared to CLS data collected in a laboratory setting from previous studies. Five participants took part in studies in both settings. Precalibrated equipment was delivered to participants who performed headphone output level checks and measured ambient noise levels. After a practice run, CLS measurements were collected for two runs at 1 and 4 kHz. Results: Mean headphone output levels were within 1.5 dB of the target calibration level. Mean ambient noise levels were below the target level. Within-run variability was similar between the two settings, but across-run bias was smaller for data collected in the laboratory setting compared with the remote setting. Systematic differences in CLS functions were not observed for the five individuals who participated in both settings. Conclusions: This study demonstrated that precise stimulus levels can be delivered and background noise levels can be controlled in a home environment. Across-run bias for remote CLS was larger than for in-laboratory CLS, indicating that further work is needed to improve the reliability of CLS data collected in remote settings. Supplemental Material https://doi.org/10.23641/asha.17131856

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