Visualizing Phase Relations of the Vocal Folds by Means of High-Speed Videoendoscopy

Krenmayr, Andreas; Wöllner, Thomas; Supper, Nicola; Zorowka, Patrick

doi:10.1016/j.jvoice.2011.05.005

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…as is seen in a one-mass model of the vocal folds (see Flanagan and Landgraf, 1968)]. Rather, their vibration is characterized by phase differences along both the inferior-superior (Baer, 1981;Titze et al, 1993) and anterior-posterior (A-P) dimensions (Tanabe et al, 1975;Krenmayr et al, 2012;Orlikoff et al, 2012;Yamauchi et al, 2013). These phase differences cause time-delayed contacting and de-contacting of the vocal folds along the respective axes.…”

Section: Introductionmentioning

confidence: 99%

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Herbst

Lohscheller

Švec

et al. 2014

Journal of Experimental Biology

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Previous research has suggested that the peaks in the first derivative (dEGG) of the electroglottographic (EGG) signal are good approximate indicators of the events of glottal opening and closing. These findings were based on high-speed video (HSV) recordings with frame rates 10 times lower than the sampling frequencies of the corresponding EGG data. The present study attempts to corroborate these previous findings, utilizing super-HSV recordings. The HSV and EGG recordings (sampled at 27 and 44 kHz, respectively) of an excised canine larynx phonation were synchronized by an external TTL signal to within 0.037 ms. Data were analyzed by means of glottovibrograms, digital kymograms, the glottal area waveform and the vocal fold contact length (VFCL), a new parameter representing the time-varying degree of 'zippering' closure along the anterior-posterior (A-P) glottal axis. The temporal offsets between glottal events (depicted in the HSV recordings) and dEGG peaks in the opening and closing phase of glottal vibration ranged from 0.02 to 0.61 ms, amounting to 0.24-10.88% of the respective glottal cycle durations. All dEGG double peaks coincided with vibratory A-P phase differences. In two out of the three analyzed video sequences, peaks in the first derivative of the VFCL coincided with dEGG peaks, again co-occurring with A-P phase differences. The findings suggest that dEGG peaks do not always coincide with the events of glottal closure and initial opening. Vocal fold contacting and de-contacting do not occur at infinitesimally small instants of time, but extend over a certain interval, particularly under the influence of A-P phase differences.KEY WORDS: Electroglottography, dEGG double peaks, Highspeed video, Vocal fold contact length, Excised canine larynx, Glottal opening and closing events

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Section: Introductionmentioning

confidence: 99%

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Herbst

Lohscheller

Švec

et al. 2014

Journal of Experimental Biology

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“…Varying open-close timing characteristics and glottal area perturbation within normal phonation in adults were reported by Ahmad, Yan, and Bless (2012) from high-speed analysis using the Hilbert transform. Using a method of Fourier image analysis, Krenmayr, Wollner, Supper, and Zorowka (2012) reported left-right phase difference of an average of 15 o in 11 subjects with normal voice. Using a method of Fourier image analysis, Krenmayr, Wollner, Supper, and Zorowka (2012) reported left-right phase difference of an average of 15 o in 11 subjects with normal voice.…”

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Characterizing Vibratory Kinematics in Children and Adults With High-Speed Digital Imaging

Patel

Dubrovskiy

Döllinger

2014

J Speech Lang Hear Res

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PURPOSE The aim of this study is to quantify and identify characteristic vibratory motion in typically developing prepubertal children and young adults using high-speed digital imaging. METHOD The vibrations of the vocal folds were recorded from 27 children (ages 5-9 years) and 35 adults (ages 21-45 years), with high speed at 4,000 frames per second for sustained phonation. Kinematic features of amplitude periodicity, time periodicity, phase asymmetry, spatial symmetry, and glottal gap index were analyzed from the glottal area waveform across mean and standard deviation (i.e., intercycle variability) for each measure. RESULTS Children exhibited lower mean amplitude periodicity compared to men and women and lower time periodicity compared to men. Children and women exhibited greater variability in amplitude periodicity, time periodicity, phase asymmetry, and glottal gap index compared to men. Women had lower mean values of amplitude periodicity and time periodicity compared to men. CONCLUSION Children differed both spatially but more temporally in vocal fold motion, suggesting the need for the development of children-specific kinematic norms. Results suggest more uncontrolled vibratory motion in children, reflecting changes in the vocal fold layered structure and aero-acoustic source mechanisms.

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“…It is becoming increasingly recognized that left–right (L-R) asymmetries of laryngeal structure and vocal fold vibration occur in people without and with voice disorders (Bonilha, Deliyski, & Gerlach, 2008; Bonilha, Deliyski, Whiteside, & Gerlach, 2012; Kendall, 2009; Kimura et al, 2010; Krenmayr, Wöllner, Supper, & Zorowka, 2012; Lindestad, Hertegård, & Björck, 2004; Niimi & Miyaji, 2000; Yamauchi et al, 2012). When a patient presents to a voice clinic with concerns about voice quality, asymmetries are often assumed to be part of the presenting disorder (Bonilha, O'Shields, Gerlach, & Deliyski, 2009); yet, L-R and anterior-posterior vibratory asymmetries (Bonilha et al, 2008) and arytenoid adduction asymmetries (Bonilha et al, 2009; Lindestad et al, 2004) occur in most speakers with normal voices.…”

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confidence: 99%

“…Introduction of vocabulary to specify vibration asymmetries in kymography (Švec, Šram, & Schutte, 2007) and high-speed videoendoscopy, and automation of measures over multiple cycles (Krenmayr et al, 2012; Mehta, Deliyski, Quatieri, & Hillman, 2011; Mehta, Zañartu, Quatieri, Deliyski, & Hillman, 2011) have improved the likelihood of consistency across studies in rating or measuring vibratory symmetry. Human subjects, however, typically present with more than one asymmetry, and the asymmetries often occur in the context of other features of vocal fold vibration such as aperiodicity and incomplete closure, making it difficult to determine which features lead to vocal function changes.…”

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confidence: 99%

Acoustic and Perceptual Effects of Left–Right Laryngeal Asymmetries Based on Computational Modeling

Samlan

Story

Lotto

et al. 2014

J Speech Lang Hear Res

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Purpose Computational modeling was used to examine the consequences of 5 different laryngeal asymmetries on acoustic and perceptual measures of vocal function. Method A kinematic vocal fold model was used to impose 5 laryngeal asymmetries: adduction, edge bulging, nodal point ratio, amplitude of vibration, and starting phase. Thirty /a/ and /I/ vowels were generated for each asymmetry and analyzed acoustically using cepstral peak prominence (CPP), harmonics-to-noise ratio (HNR), and 3 measures of spectral slope (H1*-H2*, B0-B1, and B0-B2). Twenty listeners rated voice quality for a subset of the productions. Results Increasingly asymmetric adduction, bulging, and nodal point ratio explained significant variance in perceptual rating (R2 = .05, p < .001). The same factors resulted in generally decreasing CPP, HNR, and B0-B2 and in increasing B0-B1. Of the acoustic measures, only CPP explained significant variance in perceived quality (R2 = .14, p < .001). Increasingly asymmetric amplitude of vibration or starting phase minimally altered vocal function or voice quality. Conclusion Asymmetries of adduction, bulging, and nodal point ratio drove acoustic measures and perception in the current study, whereas asymmetric amplitude of vibration and starting phase demonstrated minimal influence on the acoustic signal or voice quality.

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Visualizing Phase Relations of the Vocal Folds by Means of High-Speed Videoendoscopy

Cited by 10 publications

References 17 publications

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Glottal opening and closing events investigated by electroglottography and super-high-speed video recordings

Characterizing Vibratory Kinematics in Children and Adults With High-Speed Digital Imaging

Acoustic and Perceptual Effects of Left–Right Laryngeal Asymmetries Based on Computational Modeling

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