Helmet-Mounted Displays: - USAARL - The - U.S. Army

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Ben T. Mozo
Figure 8.6. Speech intelligibility improvement for hearing impaired
aviators when compared with normal aviators at 95%
confidence interval using SPH-4.
used to measure the volunteer’s assessment of the CEP when compared to
their personal helmet. The areas of interest were comfort, compatibility,
communications performance, utility, and overall value added as assessed
by each of the individual volunteers. The rating scale used to compare the
CEP and the aviator helmet used in CH-46 and CH-53 helicopters was
based on the following 7-point scale:
_____7_____:____6____:_____5____:____4____:____3____:_____2_____:_____1_____
Significantly Moderately Slightly Same Slightly Moderately Significantly
better better better worse worse worse
A numerical rating of "7" indicated the user’s highest preference value
for the CEP while a rating of "1" indicated the users highest preference
value for the helmet. If the user perceived no difference between the CEP
and the helmet then the volunteer indicated a rating of "4.”
Results of the questionnaire responses were analyzed to determine the
overall acceptability of the CEP for use in the H-53 missions when
compared to the HGU-84 helmet. Table 8.1 shows the results of
questionnaires administered at the mid-point of the study and again at the