Comparison of the HPDLab and REATMASTER software/hardware systems for ANSI S12.6 testing.
Byrne-DC; Perry-CC; Murphy-WJ
J Acoust Soc Am 2011 Oct; 130(4)(2):2434
The American National Standard Methods for Measuring the Real-Ear Attenuation of Hearing Protectors (ANSI SI2.6-2008) requires a Bekesy procedure for testing occluded and unoccluded thresholds. Since 2002, the Nalional lnstitute for Occupational Safety and Health (NlOSH) has used the custom-designed HPDLAB software operating Tucker-Davis Technologies System 3 hardware. ViAcoustics. Nelson Acoustics, NASA, and NIOSH researchers recently developed REATMASTER which runs on National Instruments hardware in the LABVIEW environment. Ten subjects were trained by the experimenter on how to fit a passive earmuff and were qualified according to the requirements of ANSI S12.6-2008. The laboratory was configured such that diffuse sound field thresholds were tested with either the HPDLAB or REATMASTER hardware by flipping a toggle switch. The earmuff was not touched or re-positioned between test trials with the two different hardwarel software systems. The test sequence for the order of open and occluded measurements was counterbalanced across occluded conditions and hardware system. Results from this testing were used to validate the REATMASTER system for its ability to produce accurate threshold data. Preliminary results indicate no significant differences between the two systems.
Hearing; Hearing-level; Hearing-tests; Sound; Testing-equipment; Ears; Computer-software; Analytical-processes; Laboratory-testing
William J. Murphy, NIOSH, 4676 Columbia Parkway MS C-27, Cincinnati, OH 45226-1998
Journal of the Acoustical Society of America