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Attenuation of high-level impulses by earmuffs
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10.1121/1.2756973
/content/asa/journal/jasa/122/4/10.1121/1.2756973
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/4/10.1121/1.2756973

Figures

Image of FIG. 1.
FIG. 1.

Rise time (left panel) and duration (right panel) versus peak SPL of impulses outside the earmuff. Solid lines represent the average rise time or the average duration at a given SPL.

Image of FIG. 2.
FIG. 2.

The measurement setup used for transmission loss (noise reduction) measurements of earmuffs.

Image of FIG. 3.
FIG. 3.

Reduction of peak SPL of impulses with various duration and peak SPL measured for light (left panel), medium (center panel), and heavy earmuffs (right panel). Secondary axis shows the duration of the impulse outside the earmuff. Each point is the average of three measurements.

Image of FIG. 4.
FIG. 4.

Reduction of peak SPL of impulses at different peak SPL and constant (left panel) and variable (right panel) duration.

Image of FIG. 5.
FIG. 5.

Rise time of impulses measured outside and under the earmuff, for light (left panel), medium (center panel), and heavy earmuffs (right panel). Secondary axis shows the peak SPL of the impulse outside the earmuff. Each point is the average of three measurements.

Image of FIG. 6.
FIG. 6.

Upper panel: the waveform of the impulse recorded outside the earmuff. Lower panel: the waveform of the impulse recorded under the earmuff, produced by the impulse source or by striking the cup with a rubber hammer.

Image of FIG. 7.
FIG. 7.

The values of duration of impulses under and outside the earmuff, for light (left panel), medium (center panel), and heavy earmuffs (right panel). Secondary axis shows the peak SPL of the impulse outside the earmuff. Each point is the average of three measurements.

Image of FIG. 8.
FIG. 8.

The values of duration of impulses under the earmuff as a function of the duration of the impulse outside the earmuff, for light (left panel), medium (center panel), and heavy earmuffs (right panel). Secondary axis shows the peak SPL of the impulse outside the earmuff. Each point is the average of three measurements.

Image of FIG. 9.
FIG. 9.

The values of duration of impulses under the earmuff as a function of the duration of the impulse outside the earmuff, for light (left panel), medium (center panel), and heavy earmuffs (right panel). Secondary axis shows the peak SPL of the impulse outside the earmuff. Each point is the average of three measurements.

Image of FIG. 10.
FIG. 10.

Peak SPL versus , , and duration (left, middle, and right panel, respectively) for impulses recorded outside (filled circles) and under (open circles) the earmuff. Crosses represent peak SPL measured outside the earmuff and corrected with the SNR value. Solid line shows the maximum permissible level according to the CHABA criterion (left panel), Pfander criterion (middle panel), and Smoorenburg criterion (right panel). The measurements were made for 32 earmuffs.

Image of FIG. 11.
FIG. 11.

Reduction of for impulses of various duration and peak SPL, for light (left panel), medium (center panel), and heavy earmuffs (right panel). Secondary axis shows the peak SPL of the impulse outside the earmuff. Each point is the average of three measurements.

Tables

Generic image for table
TABLE I.

Earmuffs tested in the study. Data include the SNR values specified by manufacturers and decrease in peak SPL, and under conditions labeled as I, II, and III.

Generic image for table
TABLE II.

Rise time and duration of impulses measured under the earmuff at 150- and 170-dB peak SPL of the impulse outside the earmuff.

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/content/asa/journal/jasa/122/4/10.1121/1.2756973
2007-10-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Attenuation of high-level impulses by earmuffs
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/4/10.1121/1.2756973
10.1121/1.2756973
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