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Is it necessary to penalize impulsive noise +5 dB due to higher risk of hearing damage?
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10.1121/1.3573981
/content/asa/journal/jasa/129/6/10.1121/1.3573981
http://aip.metastore.ingenta.com/content/asa/journal/jasa/129/6/10.1121/1.3573981

Figures

Image of FIG. 1.
FIG. 1.

Five-second excerpt of the diffuse-field waveforms of stimuli CONT and IMP + CONT.

Image of FIG. 2.
FIG. 2.

Top: diffuse-field related (L DF,H,eq) in 1/3-octave-bands for stimuli CONT and IMP + CONT. Bottom: relative difference between the previous levels normalized at 1 kHz.

Image of FIG. 3.
FIG. 3.

Order of measurements during sessions 2 and 3. The duration of each measurement is shown in minutes.

Image of FIG. 4.
FIG. 4.

Average hearing levels across subjects before and 80 min after the noise exposures. Continuous lines correspond to the stimulus CONT; dashed lines correspond to IMP + CONT. Errorbars show SD across subjects. Top: left ear; bottom: right ear.

Image of FIG. 5.
FIG. 5.

(Color online) DPOAE levels of six subjects after exposure to stimuli CONT and IMP + CONT. The number and ear of the subject are shown at the top-right corner. Results from the stimulus CONT are presented first followed by results from IMP + CONT. The abscissa corresponds to the geometric mean of the primaries. Top: DPOAE levels at specific instants during the course of the experiment. Bottom: DPOAE shift as a function of time after the end of the exposure.

Image of FIG. 6.
FIG. 6.

(Color online) Group-average DPOAE-shift from continuous and impulsive + continuous noise exposures shown as a function of the geometric mean of the primaries and the determination time after exposure.

Image of FIG. 7.
FIG. 7.

Average pre-exposure and final DPOAE levels for the stimuli CONT (continuous lines) and IMP + CONT (dashed lines). Final levels were measured 100 min after the exposure. Errorbars show SD across subjects. The thin gray lines at the bottom correspond to the average noise levels.

Image of FIG. 8.
FIG. 8.

DPOAE-shift comparison between the maxima and minima of the DPOAE fine-structures from stimuli CONT (top) and IMP + CONT (bottom). The abscissa corresponds to the time after the end of the exposure. Errorbars show the SD across subjects.

Tables

Generic image for table
TABLE I.

Acoustic parameters of the noise stimuli CONT and IMP + CONT in a 30-s interval. All the parameters are diffuse-field related values except L ear,10min, which is measured at the blocked-entrance ear canal. The crest factor is calculated as L CpeakL Aeq,10min. L AXX % are percentile levels.

Generic image for table
TABLE II.

Three-way-ANOVA analysis for the data in Fig. 8. The factors are: (1) noise stimulus—CONT/IMP + CONT; (2) location—maxima/minima; and (3) recovery interval—eight levels. .

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/content/asa/journal/jasa/129/6/10.1121/1.3573981
2011-06-14
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Is it necessary to penalize impulsive noise +5 dB due to higher risk of hearing damage?
http://aip.metastore.ingenta.com/content/asa/journal/jasa/129/6/10.1121/1.3573981
10.1121/1.3573981
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