| Document ID (ISN) | 31453 |
| CIS number |
79-992 |
| ISSN - Serial title |
0007-1072 - British Journal of Industrial Medicine |
| Year |
1979 |
| Convention or series no. |
|
| Author(s) |
Martin A.M. |
| Title |
Dependence of acoustic attenuation of hearing protectors on incident sound level. |
| Bibliographic information |
Feb. 1979, Vol.36, No.1, p.1-14. Illus. 17 ref. |
| Abstract |
Four types of earplug and 4 types of earmuff were tested with cadaver ears fitted with a microphone, using pure-tone and 1/3-octave band steady state stimuli with sound pressure levels of 75-125dB and impulse noise of up to 135-175dB. All 8 hearing protectors had constant attenuation characteristics for the steady state sound levels, as did the 6 conventional protectors for the impulse stimuli. The 2 non-linear amplitude-sensitive protectors investigated (intended for gunfire noise) provided attenuation which increased with incident sound levels for impulse noises. The attenuation characteristics of the 6 conventional models were equal for incident sound levels at about 40 and 75dB, and constant at 75-175dB. Thus the results of threshold-shift procedures using sound levels of up to 40dB may be applied to occupations where hazardous noise is present. |
| Descriptors (primary) |
noise level; earmuffs; earplugs; sound attenuation |
| Descriptors (secondary) |
impulse noise; equipment testing; hearing protection |
| Document type |
- |
| Subject(s) |
Noise, hearing and vibration
|
| Broad subject area(s) |
|
| Browse category(ies) |
Noise
Hearing protection
|
