The attenuation of hearing protectors is determined according to standardised procedures which all utilise the Real Ear Attenuation at Threshold (REAT) method. This method imply the determination of test subjects hearing threshold both with and without wearing the hearing protector. Essentially the same procedure is used in Europe, USA, Australia and New Zealand, but the methods differ in the way the sound field is established and in the way the test subjects are instructed before the tests. Presently the international standard ISO 4869-1 for hearing protector attenuation is under revision. This is also the case for the corresponding standard in Australia (AS 1270) and recently a new American standard (S 12.6-1997) has been introduced.Results from recent investigations (March 1998) will be presented and discussed. The investigations comprise attenuation determinations in various sound fields and attenuation measurements made in accordance with both the ISO standard and the new American standard.
|Title of host publication||InterNoise 98 proceedings|
|Publication status||Published - 1998|
|Event||27th International Congress and Exhibition on Noise Control Engineering - Christchurch, New Zealand|
Duration: 16 Nov 1998 → 18 Nov 1998
Conference number: 27
|Conference||27th International Congress and Exhibition on Noise Control Engineering|
|Period||16/11/1998 → 18/11/1998|