Determination of Backup Alarm Masked Threshold in Construction Noise

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dc.contributor.authorMuchenje, Lovejoyen
dc.contributor.committeecochairCasali, John G.en
dc.contributor.committeecochairLancaster, Jeff A.en
dc.contributor.committeememberSmith-Jackson, Tonya L.en
dc.contributor.departmentIndustrial and Systems Engineeringen
dc.date.accessioned2014-03-14T20:39:21Zen
dc.date.adate2008-07-25en
dc.date.available2014-03-14T20:39:21Zen
dc.date.issued2008-05-01en
dc.date.rdate2008-07-25en
dc.date.sdate2008-06-04en
dc.description.abstractSound transmission devices have advanced filtering abilities that theoretically protect the ear from harmful Masking noise while amplifying the sounds that need to be heard, such as backup alarms. Therefore, such devices should provide improved signal detection in noise when compared to their passive counterparts. The masked threshold of a vehicular backup alarm was determined for audiometrically normal and non-normal hearers using two types of sound transmission devices and their passive counterparts within pink noise and milling machine noise at intensities of 75, 85, 95 and 105 dBA. Results indicated that the sound transmission devices did not have any statistically significant advantages over the passive devices with respect to masked threshold of a backup alarm. Therefore, it cannot be concluded that these devices offer advantage over similar passive devices with respect to signal detection. Additionally, ratings of comfort and the ability to detect the alarm for each device were gathered. Both scales did not show any significant differences between the two device types.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06042008-203917en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06042008-203917/en
dc.identifier.urihttp://hdl.handle.net/10919/33419en
dc.publisherVirginia Techen
dc.relation.haspartLovejoy.Muchenje_Thesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectmasked thresholden
dc.subjectmaskingen
dc.subjectnoiseen
dc.subjectfrequencyen
dc.subjectHPDen
dc.subjectdecibelen
dc.titleDetermination of Backup Alarm Masked Threshold in Construction Noiseen
dc.typeThesisen
thesis.degree.disciplineIndustrial and Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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