| Main Title |
A Study of Proposed Ear Protection Devices for Low Frequency Noise Attenuation. |
| Other Authors |
|
| 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. |
| Place Published |
Ft. Belvoir |
| Corporate Au Added Ent |
United States. National Technical Information Service.; ARMY MATERIEL COMMAND TEXARKANA TEX INTERN TRAINING CENTER. |
| PUB Date Free Form |
APR 1975 |
| BIB Level |
m |
| Medium |
microform |
| Content |
text |
| Carrier |
microfiche |
| Cataloging Source |
RDA |
| OCLC Time Stamp |
20150413155525 |
| Language |
eng |
| Origin |
OCLC |
| Type |
CAT |
| OCLC Rec Leader |
02323nam 2200553Ki 45020 |
