- Glottal flow,
- Genetic similarity,
- Reliability
Abstract
Studying glottal flow gives potential benefit in many disciplines. Several methods have been developed for the estimation of the glottal flow. Glottal flow can be estimated from microphone pressure signal, or Inverse filtered signal. Inverse filtering (IF) has been used widely for the understanding of phonation type, intensity, voice quality, emotions and vocal loading. However there is a dearth of information about the effectiveness or reliability of IF techniques especially in the evaluation of individuals having similar voice and speech characteristics like monozygotic twins. Also, voice source through inverse filtering has not been investigated in twins so far. In this context, the present study investigated similarity of voice source in monozygotic twins using inverse filtering and the consistency of inverse filtered parameters. Two groups of females participated in the study. Group I had 6 monozygotic twins and Group II had 6, age and gender matched unrelated pairs. None of them had any voice disorders. Subjects Phonated vowel /a / three times at least for 5 seconds in comfortable pitch and loudness. Samples were audio-recorded at a sampling rate of 48 kHz and phase linear recording. Samples were inverse filtered using Vag_physio module of VAGHMI software in formant based method. Results showed that IF parameters were reliable over the repeated trials in all individuals. Also, ANOVA showed no significant difference between groups on voice source characteristics. The open quotient (OQ) and speed quotient (SQ) was significantly different across groups. However further investigation on twin pairs selection based on perceptual similarity and confirmed genetic analysis is warranted.
References
Airas, M., & Alku, P. (2006). Emotions in vowel segments of continuous speech: analysis of the glottal flow using the normalized amplitude quotient. Phonetica,63,26-46.
Alku, P., & Vilkman, E., (1996). A comparison of glottal voice source quantification parameters in breathy, normal and pressed phonation of female and male speakers. Folia Phoniatrica Logopaedica,48, 240- 254.
Alku, P., Vilkman, E., & Laukkanen, AM. (1998). Parameterization of the voice source by combining spectral decay and amplitude features of the glottal flow. Journal of Speech Language Hearing Research, 41, 990-1002.
Ananthapadmanaba, TV. (1984). Acoustic analysis of voice source dynamics. STL-QPSR, 1-4.
Ananthapadmanabha, T.V., (2008). Voice source characterization by Inverse Filtering Proceedings of the national workshop on voice: Assessment and Management, 1-25.
Debruyne, F., Decoster, W., Van Gysel, A., & Vercammen, J. (2002). Speaking fundamental frequency in monozygotic and dizygotic twins. Journal of Voice, 16, 466- 471.
Decoster, W. A., Van Gysel, A., Vercammen, J., & Debruyne, F. (2001). Voice similarity in identical twins. Acta Oto Rhino laryngological belg, 55, 49-55.
Dromey, C., Stathopoulos, E., & Sapienza, C. (1992). Glottal airflow and EGG measures of vocal function at multiple intensities. Journal of Voice, 16, 44-54.
Fant, G. (1960). Acoustic theory of speech production. The Hague, Netherland: Mouton.
Forrai, G., & Gordos, G. (1983). A new acoustic method for the discrimination of monozygotic and dizygotic twins. Acta paediatrica Hungarica, 24, 315-321.
Gedda, L., Fiori, R., & Bruno, G. (1960). Viox chez les jumeaux monozygotiques. Folia phoniatrica, 12, 81-94.
Gobi, C., & NiChasaide, A., (2003). The role of voice quality in communicating emotion, mood and attitude. Speech Communication, 40, 189-212.
Kalaiselvi, P. S., Santhosh, M., & Savithri, S. R. (2005). Multi dimensional analysis of voice in monozygotic twins. Journal of the Acoustical Society of India, C, 25-28.
Miller, RL. (1959). Nature of the vocal Cord wave. Journal of the Acoustical Society of America,31, 667-77.
Price, PJ. (1989) Male and female voice source characteristics: inverse filtering results. Speech Communication, 8, 261-277.
Przbyla, B., Horii, T., & Crawford, M. (1992). Vocal fundamental frequency in a twin sample: looking for a genetic effect. Journal of Voice, 6, 261-266.
Rothenberg, M. (1973). A new inverse-filtering technique for deriving the glottal air flow waveform during voicing, Journal of the Acoustical Society of America, 53,1632-45.
Rothenberg, M. (1977). Measurement of air flow in speech. Journal of Speech Hearing Research, 20, I55-76.
Santosh, M., & Savithri, S. R. (2005). Voice prints in monozygotic twins. Journal of the Acoustical Society of India, C, 1-7.
Sataloff, R. (1997). Professional Voice, the Science and Art of Cliniccal Care. Singular Publishing Group, San Diego: CA.
Van Lierde, K. M., Vinck, B., De Ley, S., Clement, G., & Van Cauwenberge, P. (2005). Genetics of vocal quality characteristics in monozygotic twins: a multiparameter approach. Journal of Voice, 19, 511-518.
Vinnuri, J., Alku, P., Lauri, ER,, Sala, E., Sihvo, M., & Vilkrnan, E. (2001) Objective analysis of vocal warm-up with special reference to ergonomic factors. Journal of Voice,15,36-53.