Acoustic Voice Quality Index (AVQI)
First, record the following sentence directly into Praat (or upload to Praat): “When light strikes raindrops in the air, they act like a prism and form a rainbow.” Save this audio file as “cs” (for connected speech). It is important you save it with this title.
Side note: emerging research suggests that smartphone microphones positioned ~10 cm from the mouth can capture acceptable recordings for acoustic signal analysis
Second, record into Praat (or upload to Praat) a sustained /a/ for five seconds. From this file, extract the middle 3 seconds, and rename it as “sv” (sustained vowel). It is important you save it with this title.
Latoszek, B. B. V., Ulozaitė-Stanienė, N., Maryn, Y., Petrauskas, T., & Uloza, V. (2019). The influence of gender and age on the acoustic voice quality index and dysphonia severity index: a normative study. Journal of Voice, 33(3), 340-345.
Barsties v. Latoszek, B., Ulozaitė‐Stanienė, N., Petrauskas, T., Uloza, V., & Maryn, Y. (2019). Diagnostic accuracy of dysphonia classification of DSI and AVQI. The Laryngoscope, 129(3), 692-698.
Maryn, Y., & Weenink, D. (2015). Objective dysphonia measures in the program Praat: smoothed cepstral peak prominence and acoustic voice quality index. Journal of Voice, 29(1), 35-43.
Maryn, Y., De Bodt, M., Barsties, B., & Roy, N. (2014). The value of the Acoustic Voice Quality Index as a measure of dysphonia severity in subjects speaking different languages. European Archives of Oto-Rhino-Laryngology, 271(6), 1609-1619.
Faham, M., Laukkanen, A. M., Ikävalko, T., Rantala, L., Geneid, A., Holmqvist-Jämsén, S., ... & Pirilä, S. (2019). Acoustic voice quality index as a potential tool for voice screening. Journal of Voice.
Woerd, B., Wu, M., Vijay, P., Doyle, P.C., & Fung, K. (2020). Evaluation of acoustic analyses of voice in nonoptomized conditions. Journal of Speech, Language, and Hearing Research, 63(12), 3991-3999. https://doi.org/10.1044/2020_JSLHR-20-00212
Shuman, E., Awan, S., Rosen, C. A., Schneider, S. L. (2020, October 24). Remote Voice Testing: A comparison of cepstral analysis between two remote modalities versus in-person recording. Fall Voice Conference, University of California San Francisco.
Acknowledgments: I'd like to thank Adrián Castillo-Allendes for supplying me with the AVQI script and Sarah Schneider for references regarding remote voice testing. Thank you!