A Simple Method to Obtain Basic Acoustic Measures From Video Recordings as Subtitles Purpose Sound pressure level (SPL) and fundamental frequency (fo) are very basic and important measures in the acoustical assessment of voice quality, and their variation influences also the vocal fold vibration characteristics. Most sophisticated laryngeal videostroboscopic systems therefore also measure and display the SPL and fo values directly over the ... Research Note
Research Note  |   September 19, 2018
A Simple Method to Obtain Basic Acoustic Measures From Video Recordings as Subtitles
 
Author Affiliations & Notes
  • S. Pravin Kumar
    Faculty of Science, Department of Biophysics, Voice Research Lab, Palacký University, Olomouc, Czech Republic
  • Jan G. Švec
    Faculty of Science, Department of Biophysics, Voice Research Lab, Palacký University, Olomouc, Czech Republic
  • 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 Jan G. Švec: jan.svec@upol.cz
  • Editor-in-Chief: Julie Liss
    Editor-in-Chief: Julie Liss×
  • Editor: Jack Jiang
    Editor: Jack Jiang×
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Hearing & Speech Perception / Acoustics / Speech, Voice & Prosody / Speech / Research Notes
Research Note   |   September 19, 2018
A Simple Method to Obtain Basic Acoustic Measures From Video Recordings as Subtitles
Journal of Speech, Language, and Hearing Research, September 2018, Vol. 61, 2196-2204. doi:10.1044/2018_JSLHR-S-17-0472
History: Received December 21, 2017 , Revised February 23, 2018 , Accepted April 26, 2018
 
Journal of Speech, Language, and Hearing Research, September 2018, Vol. 61, 2196-2204. doi:10.1044/2018_JSLHR-S-17-0472
History: Received December 21, 2017; Revised February 23, 2018; Accepted April 26, 2018
Web of Science® Times Cited: 1

Purpose Sound pressure level (SPL) and fundamental frequency (fo) are very basic and important measures in the acoustical assessment of voice quality, and their variation influences also the vocal fold vibration characteristics. Most sophisticated laryngeal videostroboscopic systems therefore also measure and display the SPL and fo values directly over the video frames by means of a rather expensive special hardware setup. An alternative simple software-based method is presented here to obtain these measures as video subtitles.

Method The software extracts acoustic data from the video recording, calculates the SPL and fo parameters, and saves their values in a separate subtitle file. To ensure the correct SPL values, the microphone signal is calibrated beforehand with a sound level meter.

Results The new approach was tested on videokymographic recordings obtained laryngoscopically. The results of SPL and fo values calculated from the videokymographic recording, subtitles creation, and their display are presented.

Conclusions This method is useful in integrating the acoustic measures with any kind of video recordings containing audio data when inbuilt hardware means are not available. However, calibration and other technical aspects related to data acquisition and synchronization described in this article should be properly taken care of during the recording.

Acknowledgments
The study was supported by the Technology Agency of the Czech Republic Project no. TA04010877 (2015-17) and Czech Science Foundation (GA ČR) Project no. GA16-01246S (2016-18). We thank Sri Sivasubramaniya Nadar, College of Engineering, Kalavakkam, India, for granting the leave of absence to S. P. K. during his sabbatical stay (2016–2018) at Palacký University in Olomouc, Czech Republic. In addition, we thank Dr. J. Vydrova from the Voice Centre Prague for the clinical videokymographic recording used in this article.
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