Record Display for the EPA National Library CatalogRECORD NUMBER: 1 OF 5
|Main Title||A Study of Proposed Ear Protection Devices for Low Frequency Noise Attenuation.|
|Publisher||Defense Technical Information Center,|
|Report Number||USAMC-ITC-02-08-75-004; AD-A009 274|
|Subjects||Noise reduction ; Ear protectors ; Market research ; Models ; Army personnel ; Prototypes ; Sound ; Protection ; Attenuation ; Low frequency ; Hearing ; Helmets ; Earphones ; Protective Equipment|
"AD-A009 274." "USAMC-ITC-02-08-75-004." "Filmed 6-3-75 NTIS." Microfiche.
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.