Hearing Threshold Shifts to High Frequency Tonal Pulses

Abstract

Thirteen normal-hearing enlisted were given 11 two-hour trains of pulses at 3.5 kHz at 100 dB SPL. Acoustic load was gradually increased from one 0.5-sec pulse every 60 sec to one 0.75-sec pulse every 15 sec, at which point the group temporary threshold shift approached this Laboratory's Internal Damage Risk Criteria (DRC) and the experiment terminated. A very tentative and non- conservative estimate was made from these data and from the sparse literature that the ears of these men could just stand such pulses for days on end only if the SPL were reduced to 90 dB and the percentage on-time did not exceed 5%. More precise DRC must wait upon rather massive data from individual subjects on the time needed for full recovery from single high-intensity pulses.

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1974
Accession Number
ADA000967

Entities

People

  • J. Donald Harris

Organizations

  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Abstracts
  • Active Sonar
  • Biomedical Research
  • Classification
  • Ear
  • Echo Ranging
  • Frequency
  • Intensity
  • Literature
  • Navy
  • Organ Of Corti
  • Recovery
  • Repetition Rate
  • Security
  • Sound Pressure
  • Standards
  • Submarines

Readers

  • Auditory Neuroscience/Auditory Physiology.
  • Mathematics or Statistics
  • Pulsed Power and Plasma Physics.