An Objective Method for Evaluating Ear Protectors.
Environmental Acoustics Laboratory, Pennsylvania State University, University Park, Pennsylvania, Progress Report :33 pages
An extensive literature search was performed to collect information on the evaluation of ear protective devices. An experimental study was then performed in which the attenuation of five earplugs and five different kinds of ear muffs would be measured in free field using pure tones and bands of noise as specified in the present standard. The attenuation characteristics of the same ten ear protectors were then measured in a semireverberant sound field using 1/3 octave bands of noise as stimuli. The degree of diffuseness was determined and a method was developed to measure this diffuseness. The attenuation of the five ear muffs was then measured using the artificial head test fixtures. According to the author, the most difficult problem encountered has been the definition of the degree of diffuseness of the sound field in the semireverberant room. It is hoped that a sufficiently simple and general method of determining the diffuseness of the sound field can be devised that will not necessitate the use of cross and autocorrelation techniques.
NIOSH-Grant; Measurement-equipment; Noise-exposure; Ear-protection; Personal-protective-equipment; Ear-protectors; Hearing-protection;
None Pennsylvania State University Box 30 State College, PA 16801
NTIS Accession No.
Environmental Acoustics Laboratory, Pennsylvania State University, University Park, Pennsylvania, Progress Report
Pennsylvania State University, University Park, Pennsylvania