Calibration of Clinical Audio Recording and Analysis Systems for Sound Intensity Measurement Purpose Sound intensity is an important acoustic feature of voice/speech signals. Yet recordings are performed with different microphone, amplifier, and computer configurations, and it is therefore crucial to calibrate sound intensity measures of clinical audio recording and analysis systems on the basis of output of a sound-level meter. This study ... Research Article
Research Article  |   November 01, 2015
Calibration of Clinical Audio Recording and Analysis Systems for Sound Intensity Measurement
 
Author Affiliations & Notes
  • Youri Maryn
    Sint-Augustinus General Hospital, European Institute of ORL, Antwerp, Belgium
    University College Ghent, Belgium
    University of Antwerp, Belgium
    Vlaamse Vereniging voor Logopedisten, Belsele, Belgium
  • Andrzej Zarowski
    Sint-Augustinus General Hospital, European Institute of ORL, Antwerp, Belgium
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Youri Maryn: youri.maryn@gza.be
  • Editor: Krista Wilkinson
    Editor: Krista Wilkinson×
  • Associate Editor: Julie Barkmeier-Kraemer
    Associate Editor: Julie Barkmeier-Kraemer×
Article Information
Hearing & Speech Perception / Acoustics / Hearing Disorders / Speech, Voice & Prosody / Research Articles
Research Article   |   November 01, 2015
Calibration of Clinical Audio Recording and Analysis Systems for Sound Intensity Measurement
American Journal of Speech-Language Pathology, November 2015, Vol. 24, 608-618. doi:10.1044/2015_AJSLP-14-0082
History: Received June 14, 2014 , Revised December 13, 2014 , Accepted May 28, 2015
 
American Journal of Speech-Language Pathology, November 2015, Vol. 24, 608-618. doi:10.1044/2015_AJSLP-14-0082
History: Received June 14, 2014; Revised December 13, 2014; Accepted May 28, 2015
Web of Science® Times Cited: 1

Purpose Sound intensity is an important acoustic feature of voice/speech signals. Yet recordings are performed with different microphone, amplifier, and computer configurations, and it is therefore crucial to calibrate sound intensity measures of clinical audio recording and analysis systems on the basis of output of a sound-level meter. This study was designed to evaluate feasibility, validity, and accuracy of calibration methods, including audiometric speech noise signals and human voice signals under typical speech conditions.

Method Calibration consisted of 3 comparisons between data from 29 measurement microphone-and-computer systems and data from the sound-level meter: signal-specific comparison with audiometric speech noise at 5 levels, signal-specific comparison with natural voice at 3 levels, and cross-signal comparison with natural voice at 3 levels. Intensity measures from recording systems were then linearly converted into calibrated data on the basis of these comparisons, and validity and accuracy of calibrated sound intensity were investigated.

Results Very strong correlations and quasisimilarity were found between calibrated data and sound-level meter data across calibration methods and recording systems.

Conclusions Calibration of clinical sound intensity measures according to this method is feasible, valid, accurate, and representative for a heterogeneous set of microphones and data acquisition systems in real-life circumstances with distinct noise contexts.

Acknowledgments
The first author did all the calibrations himself within his salaried mandate as member of Executive Committee of the Vlaamse Vereniging voor Logopedisten [Flemish Association of Speech-Language Therapists].
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