Accession Number : AD0701859

Title :   SOUND TRANSMISSION THROUGH THE COMBAT VEHICLE CREWMAN'S HELMET WHEN THE SEAL OF THE EARPADS IS BROKEN.

Descriptive Note : Research study rept.,

Corporate Author : QUARTERMASTER RESEARCH AND ENGINEERING CENTER NATICK MASS

Personal Author(s) : Cohen,Alexander

Report Date : SEP 1960

Pagination or Media Count : 15

Abstract : One of the basic functions of the Helmet, Combat Vehicle Crewman's, T-56-6, is to protect operating personnel against the high noise levels found in tanks and other armored vehicles. The noise suppression capability of this helmet, however, constitutes an impairment to the wearer's ability to hear when worn outside such vehicles in comparatively quiet situations. Under the latter conditions, a means of permitting sounds to pass to the ears with minimum losses in intensity is required. It was the purpose of the study to determine how much improvement in sound reception would result if the seals between the CVC helmet earpieces and the wearer's ears were broken. (Author)

Descriptors :   (*ARMORED VEHICLES, OPERATORS(PERSONNEL)), (*ARMY PERSONNEL, *HELMETS), (*EAR PROTECTORS, SEALS), (*SOUND TRANSMISSION, HELMETS), HEARING, EARPHONES, MICROPHONES, NOISE, THRESHOLDS(PHYSIOLOGY)

Subject Categories : Electrical and Electronic Equipment
      Logistics, Military Facilities and Supplies
      Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE