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Related Experiment Videos

Duration, compression, and the aided loudness discomfort level.

T Fortune1, T Scheller

  • 1Telex Communications, Burnsville, Minnesota 55337, USA.

Ear and Hearing
|September 12, 2000
PubMed
Summary

Listeners tolerate louder sounds for shorter durations. Hearing aid compression circuits impact this effect, influencing audibility and speech recognition, especially with low compression thresholds and slow attack times.

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Area of Science:

  • Audiology
  • Acoustics
  • Hearing Aid Technology

Background:

  • Loudness discomfort level (LDL) is crucial for hearing aid fitting.
  • The influence of signal duration on LDL and its interaction with hearing aid compression is not fully understood.

Purpose of the Study:

  • To investigate how unaided and aided LDL varies with input signal duration.
  • To determine if electroacoustic characteristics of compression circuits affect the listener's dynamic range for short sounds.

Main Methods:

  • LDL was measured for noise bursts of varying durations (32-1024 ms) in 10 hearing-impaired and 20 normal-hearing listeners.
  • Testing included unaided conditions and hearing aids with various analog and digital compression circuits.
  • Listeners also self-adjusted hearing aid output to their LDL.

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Main Results:

  • Unaided listeners tolerated higher sound levels for shorter durations.
  • Compression circuits with low compression thresholds (45-50 dB SPL) and low ratios (2:1) preserved duration-dependent LDL effects.
  • High compression ratios (8:1) resulted in flat LDL duration functions, diminishing duration effects.

Conclusions:

  • Listeners' ability to tolerate louder sounds for shorter durations has implications for hearing aid design.
  • Circuits preserving duration-dependent LDL may enhance audibility and speech recognition.
  • Low compression thresholds, low ratios, and slow attack times appear optimal for maintaining this effect.