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

232
Ben T. Mozo
Item Mass
(grams)
CEP with HGU-56/P interface cable and blown-air port
adapter
-CEP
-Interface cable
-Blown-air port adapter
HGU-56/P earcup w/ foam inserts, #2990 earseal, and #996
earphone - X2
HGU-56/P earcup with foam inserts and #2990 earseal - X 2
Earphone (Model #996)
ANR earcup and earseal - X2
18.8
8.0
5.0
5.8
215.0
175.0
19.8
308.4
D’Angelo, 1994). Helicopters like the LongBow AH-64 and Comanche
can benefit from the 3-D technique since radar signals are available as to
locations of targets relative the aviator. Parameters provided by the radar
can be used to place an auditory cue at the relative target orientation and
direct the head position to the proper location, thus increasing probability
of visual detection.
Locations of radio receivers may be distributed around the auditory
space of the aviator in a manner that will enable selective attention based
on the position perceived by the listener. ICSs may be adapted to provide
the listener with information as to the talker’s location and again allow for
selective attention that may be based on mission requirements at that
particular time. There are indications in the literature that the 3-D audio
approach may improve the speech intelligibility of information received
over the ICS (McKinley, Erickson, and D’Angelo, 1994). Currently,
helmet/communications systems in the aircraft are designed for monaural
operation. In the advent of 3-D audio, the system will require redesign to
accommodate binaural input.
References
American National Standards Institute. 1984. Method for the
measurement of the real-ear attenuation of hearing protectors. ANSI
12.6-1984.