Accession Number : ADA182946

Title :   Evaluation of a Communication Beanie for Use with the MK 12 SSDS.

Descriptive Note : Final rept.,

Corporate Author : NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL

Personal Author(s) : Knafelc,M E ; Curley,M D

PDF Url : ADA182946

Report Date : Apr 1987

Pagination or Media Count : 12

Abstract : The effectiveness of a beanie to improve communication and provide helmet noise attenuation was assessed. Eight male divers dove repeatedly on air to 6, 130, and 190 FSW wearing the MD 12 SSDS helmet in the normal configuration and with a communication beanie. A modified rhyme test performed at depth showed the beanie significantly improved speech intelligibility. The divers' hearing threshold levels were measured pre and immediately post dive. The temporary threshold shifts as a result of the noise exposures did not vary significantly as a function of helmet configuration or depth. However, the auditory data showed that auditory threshold shifts recovered during resting decompression. These findings indicate that present U. S. Navy diving procedures for diving the MK 12 SSDS in air do not lead to permanent hearing damage. Furthermore, the communication beanie significantly improved speech intelligibility.

Descriptors :   HELMETS, *ACOUSTIC ATTENUATION, *UNDERWATER COMMUNICATIONS, HEARING, DECOMPRESSION, DIVING, NAVAL OPERATIONS, DEAFNESS, INTELLIGIBILITY, SHIFTING, THRESHOLD EFFECTS, THRESHOLDS(PHYSIOLOGY), EXPOSURE(PHYSIOLOGY), NOISE, SPEECH, ACOUSTIC COMMUNICATIONS, PERFORMANCE(ENGINEERING), SPEECH RECOGNITION

Subject Categories : Voice Communications
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE