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Speech intelligibility and passive, level-dependent earplugs.

Julie A Norin1, Diana C Emanuel, Tomasz R Letowski

  • 1The Hearing and Speech Agency, Baltimore, Maryland 21215, USA. jnorin@hasa.org

Ear and Hearing
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

Level-dependent earplugs do not hinder speech understanding in noise for individuals with normal hearing. These hearing protection devices are suitable for military personnel exposed to impulse noise.

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Area of Science:

  • Audiology
  • Occupational Health
  • Military Medicine

Background:

  • Noise-induced hearing loss is a prevalent occupational disease, particularly affecting military personnel due to frequent exposure to hazardous noise levels.
  • Standard hearing protection can impair crucial communication, necessitating advanced solutions like level-dependent hearing protectors.
  • Level-dependent devices aim to mitigate impulse noise while preserving speech comprehension.

Purpose of the Study:

  • To assess the impact of two passive, level-dependent earplugs (Combat Arms Earplugs and Sonic II Ear valves) on speech understanding in normal-hearing individuals.
  • To evaluate performance in low-level background noise conditions relevant to military environments.

Main Methods:

  • A repeated-measures experimental design was employed with 18 normal-hearing adults.
  • Speech recognition was tested using word lists in quiet and two noise types (multitalker, military vehicle) across three signal-to-noise ratios (SNRs: -10, 0, +10 dB) and three ear conditions (open, Combat Arms Earplugs, Sonic II Ear valves).

Main Results:

  • Word recognition scores significantly improved with increasing SNR.
  • No significant main effect was found for the type of noise or the type of earplug used.
  • A significant main effect for SNR was observed, with a slight but significant interaction between SNR and ear condition.

Conclusions:

  • Signal-to-noise ratio (SNR) critically influences speech understanding in noise, whereas noise type and earplug type have minimal impact.
  • Passive, level-dependent earplugs can be used in low-level continuous noise without compromising speech understanding for individuals with normal hearing.
  • Current passive, level-dependent earplugs used by military personnel do not appear to negatively affect speech communication under typical conversational conditions.