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Development of a Danish speech intelligibility test.

Jens Bo Nielsen1, Torsten Dau

  • 1Centre for Applied Hearing Research, Technical University of Denmark, Lyngby, Denmark. jbn@elektro.dtu.dk

International Journal of Audiology
|July 24, 2009
PubMed
Summary

A new Danish speech intelligibility test was developed to assess speech recognition threshold in noise (SRT(N)). This test utilizes a novel subjective equalization method, resulting in more consistent SRT(N) assessments across lists.

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Area of Science:

  • Audiology
  • Speech-language pathology
  • Psychoacoustics

Background:

  • Assessing speech recognition in noise is crucial for understanding hearing abilities.
  • Existing tests like the Hearing in Noise Test (HINT) use objective measures for equalization, which can introduce variability.
  • There is a need for a standardized and reliable speech intelligibility test in noise.

Purpose of the Study:

  • To develop and validate a new Danish speech intelligibility test for assessing speech recognition threshold in noise (SRT(N)).
  • To compare a novel subjective equalization method with traditional objective methods for sentence intelligibility.
  • To evaluate the consistency and reliability of the developed test.

Main Methods:

  • Development of 18 phonetically balanced Danish sentence lists (180 sentences total) using an open word-set of everyday language.

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  • Equalization of sentence intelligibility using subjective listener assessments, contrasting with objective measures used in HINT.
  • Verification of the test with 14 normal-hearing listeners to determine overall SRT(N) and list-specific deviations.

    • Main Results:

    • The novel subjective equalization method resulted in less variance between list-specific SRT(N)s compared to traditional methods.
    • The overall speech recognition threshold in noise (SRT(N)) for normal-hearing listeners was -3.15 dB SNR with a standard deviation of 1.0 dB.
    • Individual list SRT(N)s showed minimal deviation (less than 0.5 dB) from the overall mean, indicating high consistency.

    Conclusions:

    • The developed Danish speech intelligibility test, using subjective equalization, provides reliable and consistent SRT(N) measurements.
    • The new equalization method offers an improvement over traditional objective methods, reducing variability in test results.
    • This test is a valuable tool for audiological assessments of speech understanding in noisy environments.