Effect of musician's earplugs on sound level and spectrum during musical performances.

In this study, change in A-weighted and 1/3 octave sound pressure levels (SPLs) was used to assess the influence of wearing earplugs by musicians on their musical performances. Seven soloists and 3 music assembles performed 4 pieces of music with musician's earplugs donned and doffed. They used silicon custom moulded earplugs with acoustic filters designed to attenuate sound by 9, 15 or 25 dB.

Attenuation of noise by motorcycle safety helmets.

For workers such as police motorcyclists or couriers, traffic and engine noise reaching the ears is an important factor contributing to the overall condition of their work. This noise can be reduced with motorcycle helmets. In this study, insertion loss of motorcycle helmets was measured with the microphone-in-real-ear technique and sound attenuation with the real-ear-at-threshold method.

Attenuation of high-level impulses by earmuffs.

Attenuation of high-level acoustic impulses (noise reduction) by various types of earmuffs was measured using a laboratory source of type A impulses and an artificial test fixture compatible with the ISO 4869-3 standard. The measurements were made for impulses of peak sound-pressure levels (SPLs) from 150 to 170 dB. The rise time and A duration of the impulses depended on their SPL and were within a range of 12-400 mus (rise time) and 0.

Polish version of standardized noise reaction questions for community noise surveys.

Objectives: This article presents the Polish version of two standardized noise reaction questions for community noise surveys. An internationally comparable noise reaction measure for social surveys was published by Fields et al. as a result of work performed by the Community Response to Noise Team of the International Commission on the Biological Effects of Noise.