Earmuff noise attenuation by microphone in real ear technique

2010

When using a hearing protector at the workplace, it is necessary to quantify its noise attenuation by laboratory measurements. This paper aims at developing an objective methodology for measuring hearing protector noise attenuation of earmuff type using ?microphone in real ear? (MIRE) method. The methodology uses the ?insertion loss? (IL) as parameter, which is the difference between the sound pressure level with and without the hearing protector, using MIRE, and then calculating the hearing protector IL. The results for four different hearing protectors are compared with the subjective method ?real‐ear attenuation at threshold? (REAT). Factors such as physiological noise and bone conduction are quantified using the relation between MIRE and REAT method. Results are compared with values obtained from the literature.

Autores da comunidade :

• 

  J

  José Luís Bento Coelho

  ist11165

  Afiliações e fontes

  IST > CAPS

  Centro de Análise e Processamento de Sinais

• 

  M

  Miguel António Lopes de Matos Neves

  ist13443

  Afiliações e fontes

  IST > DEM

  Departamento de Engenharia Mecânica

  De: orcid

  ID: 11061540

Journal of the Acoustical Society of America (JASA)

1881

1881

127

3

0001-4966

10.1121/1.3384671

mechanical-engineering - Engenharia Mecânica

eng - Inglês