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Toward Reproducible Acoustic Voice Measurements During Laryngeal Videoendoscopy, With Emphasis on Microphones Mounted on Cameras and Rigid Laryngoscopes.

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Title: Toward Reproducible Acoustic Voice Measurements During Laryngeal Videoendoscopy, With Emphasis on Microphones Mounted on Cameras and Rigid Laryngoscopes.
Authors: Švec, Jan G.1,2 jan.svec@upol.cz, Valášková, Dominika1
Source: Journal of Speech, Language & Hearing Research. Feb2026, Vol. 69 Issue 2, p417-429. 13p.
Subject Terms: *Clinical competence, *Comparative studies, Laryngeal physiology, Statistical models, Research funding, Acoustics, Empirical research, Sex distribution, Sample size (Statistics), Product design, Signal processing, Descriptive statistics, Uncertainty, Laryngoscopy, Physiological aspects of speech, Human voice, Calibration, Video recording, Transducers, Sensitivity & specificity (Statistics)
Abstract: Purpose: Glottal adjustments and vocal fold oscillations change with the vocal intensity, pitch, and quality. Therefore, capturing and recording vocal sounds during laryngoscopy is desirable. Here, we show how camera-mounted or endoscope-mounted microphones can be comfortably used to maintain a reasonably stable mouth-to-microphone (MTM) distance and obtain reproducible acoustic measures of voice during rigid laryngoscopy. Method: We took advantage of recently obtained data on the depth of insertion of rigid laryngoscopes into the oral cavity in adult male and female subjects. Using this as a reference, we offer an empirical formula for determining the representative MTM distance in adults for 90° and 70° rigid laryngoscopes to which a microphone is fixed. The uncertainty in sound pressure level (SPL) due to inter-individual variations in laryngoscope insertion was determined using standard equations for sound radiation. Results: When microphones are mounted on the camera head or on the laryngoscope at positions 15-40 cm from the laryngoscope tip, the resulting representative MTM distances range from 5 to 33 cm. Once the representative MTM distances exceed 9 cm, the expected inherent SPL inaccuracy of the setup is less than ±2 dB, and the expected average male-to-female SPL differences are below 1 dB with 95% confidence. Conclusions: When the vocal sound is captured using a microphone fixed to a rigid laryngoscope at an MTM distance greater than 9 cm, the influence of inter-individual differences in laryngoscope insertion on the acoustic voice signal can be neglected. To minimize the influence of ambient noise and room acoustics, MTM distances greater than 30 cm are not recommended. Calibration ensures SPL accuracy and reproducibility. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Speech, Language & Hearing Research is the property of American Speech-Language-Hearing Association and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Education Research Complete
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  Data: Toward Reproducible Acoustic Voice Measurements During Laryngeal Videoendoscopy, With Emphasis on Microphones Mounted on Cameras and Rigid Laryngoscopes.
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  Data: <searchLink fieldCode="AR" term="%22Švec%2C+Jan+G%2E%22">Švec, Jan G.</searchLink><relatesTo>1,2</relatesTo><i> jan.svec@upol.cz</i><br /><searchLink fieldCode="AR" term="%22Valášková%2C+Dominika%22">Valášková, Dominika</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Speech%2C+Language+%26+Hearing+Research%22">Journal of Speech, Language & Hearing Research</searchLink>. Feb2026, Vol. 69 Issue 2, p417-429. 13p.
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  Data: *<searchLink fieldCode="DE" term="%22Clinical+competence%22">Clinical competence</searchLink><br />*<searchLink fieldCode="DE" term="%22Comparative+studies%22">Comparative studies</searchLink><br /><searchLink fieldCode="DE" term="%22Laryngeal+physiology%22">Laryngeal physiology</searchLink><br /><searchLink fieldCode="DE" term="%22Statistical+models%22">Statistical models</searchLink><br /><searchLink fieldCode="DE" term="%22Research+funding%22">Research funding</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustics%22">Acoustics</searchLink><br /><searchLink fieldCode="DE" term="%22Empirical+research%22">Empirical research</searchLink><br /><searchLink fieldCode="DE" term="%22Sex+distribution%22">Sex distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Sample+size+%28Statistics%29%22">Sample size (Statistics)</searchLink><br /><searchLink fieldCode="DE" term="%22Product+design%22">Product design</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+processing%22">Signal processing</searchLink><br /><searchLink fieldCode="DE" term="%22Descriptive+statistics%22">Descriptive statistics</searchLink><br /><searchLink fieldCode="DE" term="%22Uncertainty%22">Uncertainty</searchLink><br /><searchLink fieldCode="DE" term="%22Laryngoscopy%22">Laryngoscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Physiological+aspects+of+speech%22">Physiological aspects of speech</searchLink><br /><searchLink fieldCode="DE" term="%22Human+voice%22">Human voice</searchLink><br /><searchLink fieldCode="DE" term="%22Calibration%22">Calibration</searchLink><br /><searchLink fieldCode="DE" term="%22Video+recording%22">Video recording</searchLink><br /><searchLink fieldCode="DE" term="%22Transducers%22">Transducers</searchLink><br /><searchLink fieldCode="DE" term="%22Sensitivity+%26+specificity+%28Statistics%29%22">Sensitivity & specificity (Statistics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Purpose: Glottal adjustments and vocal fold oscillations change with the vocal intensity, pitch, and quality. Therefore, capturing and recording vocal sounds during laryngoscopy is desirable. Here, we show how camera-mounted or endoscope-mounted microphones can be comfortably used to maintain a reasonably stable mouth-to-microphone (MTM) distance and obtain reproducible acoustic measures of voice during rigid laryngoscopy. Method: We took advantage of recently obtained data on the depth of insertion of rigid laryngoscopes into the oral cavity in adult male and female subjects. Using this as a reference, we offer an empirical formula for determining the representative MTM distance in adults for 90° and 70° rigid laryngoscopes to which a microphone is fixed. The uncertainty in sound pressure level (SPL) due to inter-individual variations in laryngoscope insertion was determined using standard equations for sound radiation. Results: When microphones are mounted on the camera head or on the laryngoscope at positions 15-40 cm from the laryngoscope tip, the resulting representative MTM distances range from 5 to 33 cm. Once the representative MTM distances exceed 9 cm, the expected inherent SPL inaccuracy of the setup is less than ±2 dB, and the expected average male-to-female SPL differences are below 1 dB with 95% confidence. Conclusions: When the vocal sound is captured using a microphone fixed to a rigid laryngoscope at an MTM distance greater than 9 cm, the influence of inter-individual differences in laryngoscope insertion on the acoustic voice signal can be neglected. To minimize the influence of ambient noise and room acoustics, MTM distances greater than 30 cm are not recommended. Calibration ensures SPL accuracy and reproducibility. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Speech, Language & Hearing Research is the property of American Speech-Language-Hearing Association and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1044/2025_JSLHR-25-00580
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      – Code: eng
        Text: English
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    Subjects:
      – SubjectFull: Clinical competence
        Type: general
      – SubjectFull: Comparative studies
        Type: general
      – SubjectFull: Laryngeal physiology
        Type: general
      – SubjectFull: Statistical models
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      – SubjectFull: Research funding
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      – SubjectFull: Acoustics
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      – SubjectFull: Empirical research
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      – SubjectFull: Sex distribution
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      – SubjectFull: Sample size (Statistics)
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      – SubjectFull: Product design
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      – SubjectFull: Uncertainty
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      – SubjectFull: Laryngoscopy
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      – SubjectFull: Physiological aspects of speech
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      – SubjectFull: Calibration
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      – SubjectFull: Video recording
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      – SubjectFull: Transducers
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      – SubjectFull: Sensitivity & specificity (Statistics)
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      – TitleFull: Toward Reproducible Acoustic Voice Measurements During Laryngeal Videoendoscopy, With Emphasis on Microphones Mounted on Cameras and Rigid Laryngoscopes.
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            NameFull: Švec, Jan G.
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              Text: Feb2026
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              Y: 2026
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