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Transducer Variability in Speech-in-Noise Testing: Considerations Related to Stimulus Bandwidth.

Douglas S Brungart1, Alyssa J Davidson1

  • 1National Military Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD.

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Transducer type significantly impacts speech-in-noise test results. Normal-hearing individuals scored worse with insert earphones than TDH-50 headphones on the Words-in-Noise (WIN) Test, highlighting the need for standardized protocols.

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Hearing Science

Background:

  • Clinical audiologists often assume headphone and insert phone transducers yield comparable audiological test results.
  • This assumption may not hold true, potentially affecting speech-in-noise test outcomes.

Purpose of the Study:

  • To investigate significant differences in Words-in-Noise (WIN) Test scores between headphone and insert-phone transducers.
  • To explore potential contributions of American National Standards Institute S3.6 variations to transducer-dependent performance differences.

Main Methods:

  • A literature review identified studies reporting WIN Test results for normal-hearing and hearing-impaired listeners.
  • Studies specified transducer type (insert or TDH-50 headphone) for data collection.

Main Results:

  • Normal-hearing participants using insert earphones showed systematically worse WIN Test scores compared to those using TDH-50 headphones.
  • Participants with hearing loss exhibited comparable average WIN Test scores across both transducer types.

Conclusions:

  • Transducer type is crucial for interpreting WIN Test results, especially when comparing to normative data from normal-hearing individuals.
  • Standardized test administration and documentation of transducer type are essential for clinical and research speech-in-noise testing.