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Perception of microphone noise in hearing instruments

L W Lee1, E R Geddes

  • 1Department of Communicative Disorders, Northern Illinois University, DeKalb 60115, USA. LLEE@niu.edu

The Journal of the Acoustical Society of America
|December 19, 1998
PubMed
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Microphone noise in hearing instruments was studied. The just-audible level (JAL) is a reliable measure for optimizing microphone noise, unlike the just-objectionable level (JOL).

Area of Science:

  • Audiology
  • Acoustics
  • Hearing Instrument Technology

Background:

  • In hearing instruments, microphone noise is a critical factor limiting performance.
  • Understanding noise perception is essential for designing effective devices.

Purpose of the Study:

  • To investigate the perception of microphone noise in hearing instruments by normal-hearing and hearing-impaired listeners.
  • To evaluate the reliability of the just-objectionable level (JOL) and just-audible level (JAL) as measures for noise in hearing instruments.

Main Methods:

  • Noise levels were measured in one-third octave bands (250-5000 Hz) as input-referred values.
  • Two perceptual measures were assessed: just-objectionable level (JOL) and just-audible level (JAL).
  • Listeners included both normal-hearing and hearing-impaired individuals.

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Main Results:

  • The just-objectionable level (JOL) demonstrated high variability across listeners, indicating unreliability.
  • The just-audible level (JAL) provided a more consistent and reliable measure of noise perception.
  • Mean values for JAL were found to be a dependable indicator.

Conclusions:

  • The just-audible level (JAL) is recommended as a reliable metric for assessing microphone noise in hearing instruments.
  • Mean JAL values should guide the optimization of microphone noise design for improved hearing instrument performance.
  • The JOL is not recommended for use in hearing instrument noise design due to listener variability.