Naval Submarine Medical Center Naval Submarine Base New London Groton, Connecticut Memorandum Report 69-7 ,. a Determination for the Navy of Zero Hearing
نویسنده
چکیده
Twenty three normal-hearing candidates for the Submarine Force were examined for Speech Reception Threshold (SRT) by speech audiometry using phonetically-balanced (PB) lists of monosyllables instead of the usual spondee words. Such PB words are felt to be considerably better in assessing the important frequency regions for daily speech communication, namely, 500-2000 cycles per second. The Navy threshold for SRTPB is 25 db sound pressure level re 0.0002 dyne/cm, or 6 db higher than the standard SRT spondees. A standard speech audiometer, now calibrated for spondees according to USA Standards Institute specifications, can then be used with the PB lists by subtracting 6 db from the Hearing Level dial reading to arrive at the particular subject's SRTPB.
منابع مشابه
Naval Submarine Medical Research Laboratory Naval Submarine Medical Center Groton, Connecticut 06340 Memorandum. Report 70-7 an Investigation of the Effects of a Helium-oxygen Breathing Mixture on Hearing in Naval Personnel
Hearing levels of three subjects were measured at 125, 1000 and 8000 Hertz while the subjects were breathing air and while breathing an 80%/20% mixture of helium and oxygen. No significant change in hearing levels which could be attributed to the effects of the gas breathed were detected during or following a thirty-minute period on helium-oxygen.
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تاریخ انتشار 2011