Document Detail


Impulse noise reduction for hearing protectors.
MedLine Citation:
PMID:  19355544     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
In 2009, the United States Environmental Protection Agency will propose a revision to the federal regulation for the labeling of hearing protection devices, 40 CFR 211 Subpart B. One of the new features of the proposed rule was the measurement of an impulse noise reduction rating for hearing protection devices. Measurement of impulsive sounds is challenging technically from an acoustics perspective. This paper will report on the performance of an acoustic shock tube used to generate impulses between 140 and 170 dB peak sound pressure level. The calibration methods for the microphones will be discussed and the measurements for a variety of hearing protectors will be presented. Typical earmuffs are capable of impulsive noise reduction ratings of between 20 and 35 dB. Earplugs provide similar range of performance. Combinations of earmuff and earplug have yielded impulse peak reductions of more than 50 dB. The reduction of the impulse peak level should provide a means to predict exposure at the ear when a hearing protector is worn in an impulsive noise environment.
Authors:
William Murphy
Related Documents :
6521454 - Effects of reducing low-frequency amplification on consonant perception in quiet and no...
19355134 - Discrimination of formant-like glides in gated noise: effect of sensation level.
19536554 - Comparison of pure tone audiometry and auditory steady-state responses in subjects with...
6707324 - Temporal integration of forward masking in listeners having sensorineural hearing loss.
3720894 - Vibration-evoked responses from lamellated corpuscles in the legs of kangaroos.
12396574 - Intramuscular sensation in conscious human subjects: a qualitative and quantitative stu...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  125     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-04-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2744     Citation Subset:  IM    
Affiliation:
Natl. Inst. for Occupational Safety and Health, Div. Appllied Res. and Technol., Hearing Loss Prevention Team, 4676 Columbia Pkwy., MS C-27, Cincinnati, OH 45226-1998, wjm4@cdc.gov.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Noise barriers based on recycled materials.
Next Document:  Are hybrid cars too quiet?