Record Display for the EPA National Library Catalog

RECORD NUMBER: 25 OF 1745

Main Title A Study of Proposed Ear Protection Devices for Low Frequency Noise Attenuation.
Other Authors
Author Title of a Work
Dallosta, Patrick Michael.
Publisher Defense Technical Information Center,
Year Published 1975
Report Number USAMC-ITC-02-08-75-004; AD-A009 274
OCLC Number 907255881
Subjects Noise reduction ; Ear protectors ; Market research ; Models ; Army personnel ; Prototypes ; Sound ; Protection ; Attenuation ; Low frequency ; Hearing ; Helmets ; Earphones ; Protective Equipment
Holdings
Library Call Number Additional Info Location Last
Modified		 Checkout
Status
EKBD  AD-A009 274 Microfiche collection Research Triangle Park Library/RTP, NC 04/21/2015
Collation 143 pages
Notes
"AD-A009 274." "USAMC-ITC-02-08-75-004." "Filmed 6-3-75 NTIS." Microfiche.
Contents Notes
The investigation was undertaken to evaluate several methods of ambient noise attenuation, proposed by Columbia Broadcasting Systems, and Bolt, Beranek, and Newman. It also explores the new developments in the area of active noise supression. The end result of the attenuation method was the employment of the selected device in the SPH-4 helmet. Both companies proposed new models and suggestions for not only active, but also passive systems. The results of the study indicate that the best form of attenuation lies with the passive methods.