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Comparison of three calibration procedures for free-field reference speech audiometry.

In standards IEC 60645-1 and ANSI S3.6, the free-field equivalent earphone output level method is assumed as the reference for speech audiometry. Three calibration procedures for this method were compared in this study. Speech audiometry was conducted with Dutch consonant-vowel-consonant words for t...

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Published in:International Journal of Audiology Vol. 63; no. 7; pp. 527 - 535
Main Authors: Janssens-bij de Vaate, Mieke, Rhebergen, Koenraad S.
Format: equations & formulas research tables/charts Journal Article
Published: Taylor & Francis Ltd Jul2024
Online Access:View this record in EBSCOhost
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        14992027
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      jtl: International Journal of Audiology
      issn: 14992027
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      dt: Jul2024
      vid: 63
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      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
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        10.1080/14992027.2023.2208288
        178152359
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        atl: Comparison of three calibration procedures for free-field reference speech audiometry.
      aug:
        au:
          Janssens-bij de Vaate, Mieke
          Rhebergen, Koenraad S.
        affil: Department of Otorhinolaryngology and Head and Neck Surgery, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands
      sug:
        subj:
          Calibration Methods
          Audiometry, Speech
          Human
          Male
          Female
          Adult
          Transducers
          Speech Intelligibility
          Speech Reception Threshold Test
          Comparative Studies
          Repeated Measures
          Analysis of Variance
          Speech Perception
          Descriptive Statistics
          Netherlands
          Consonants
          Vowels
          Adult: 19-44 years
          Male
          Female
      ab: In standards IEC 60645-1 and ANSI S3.6, the free-field equivalent earphone output level method is assumed as the reference for speech audiometry. Three calibration procedures for this method were compared in this study. Speech audiometry was conducted with Dutch consonant-vowel-consonant words for the following conditions: 1. TDH39 earphones, 2. loudspeaker, and 3. free-field simulated with TDH39 earphones. The first calibration procedure was based on the empirically determined difference between the speech recognition threshold (SRT) with earphones and a loudspeaker. The second procedure was based on the theoretical free-field correction, derived from the known speech spectrum and the free-field to coupler difference. The third calibration procedure corresponded to the results of the free-field simulated speech material under earphones. The sample included 20 normal hearing subjects. The differences between the observed SRT in the free-field and earphone conditions and the free-field and simulated free-field conditions were 7.1 dB and 0.6 dB, respectively. The three calibration procedures for the free-field equivalent output method yielded approximately the same results, and therefore all appear to be useful for TDH39 earphones.
      pubtype: Academic Journal
      doctype:
        equations & formulas
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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