Human subject investigation of MIRE microphone location during insertion loss testing of Active Noise Reduction hearing protectors in active and passive modes

Systematic Evaluation of the Relationship between Physical and Psychoacoustical Measurements of Hearing Protectors’ Attenuation

“…Casali et al (3) presented some comparisons and results on earmuffs showing that NR an IL yield comparable results as long as the NR values are corrected by an average transfer-function-of-the-open-ear (TFOE), as previously discussed by Berger (1) . Similar work on earmuffs with active noise reduction systems was presented by Perala and Casali (8) . One interesting point of this study is that the authors compared frequencydependent attenuation data, obtained with the MIRE method, measured at three different microphone locations in the ear canal and concluded that small, but statistically significant differences were observed between the different microphone locations, depending on the frequency.…”

Determinación de la atenuación en dispositivos auditivos tipo orejera aplicados en la protección, comunicación y entretenimiento con control activo de ruido

“…Austral de Chile, Casilla 567, Valdivia, Chile. E-mail: jpare nas@uach.cl 3 Laboratorio de Ruido Industrial, Univ. Federal de Santa Catarina, Florianópolis, SC 88040-900, Brasil, E-mail: samir@emc.ufsc.br RESUMEN En este trabajo se expone un análisis para determinar el desempeño en la reducción del ruido de tres tipos de Dispositivos Auditivos (DA) con cancelación activa de ruido aplicados a la protección, comunicación y entretenimiento utilizando como referencia tres normas una Europea (SS-EN 352 4), otra estadounidense (ANSI/ASA S12.42-2010) y otra Internacional (ISO 4869-6), que entregan todas las especificaciones técnicas, teóricas y prácticas para evaluar el desempeño.…”