Influence of F0 and Sequence Length of Audio and Electroglottographic Signals on Perturbation Measures for Voice Assessment

Hohm, Julian; Döllinger, Michael; Bohr, Christopher; Kniesburges, Stefan; Ziethe, Anke

doi:10.1016/j.jvoice.2014.10.001

Cited by 7 publications

(8 citation statements)

References 36 publications

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“…Parameters calculated directly from obtained data grant a certain objectivity of the analysis in contrast to subjective evaluation of voice quality and laryngeal imaging, which often results in a low inter- and intra-rater reliability [31, 32]. Still, different influences on parameters obtained from HSV and the audio signal, being sometimes recorded parallely to HSV [33, 34], are not understood in detail and are currently under investigation [35–40]. There are several potential factors that can affect parameter values.…”

Section: Introductionmentioning

confidence: 99%

Influence of spatial camera resolution in high-speed videoendoscopy on laryngeal parameters

et al. 2019

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In laryngeal high-speed videoendoscopy (HSV) the area between the vibrating vocal folds during phonation is of interest, being referred to as glottal area waveform (GAW). Varying camera resolution may influence parameters computed on the GAW and hence hinder the comparability between examinations. This study investigates the influence of spatial camera resolution on quantitative vocal fold vibratory function parameters obtained from the GAW. In total 40 HSV recordings during sustained phonation (20 healthy males and 20 healthy females) were investigated. A clinically used Photron Fastcam MC2 camera with a frame rate of 4000 fps and a spatial resolution of 512×256 pixels was applied. This initial resolution was reduced by pixel averaging to (1) a resolution of 256×128 and (2) to a resolution of 128×64 pixels, yielding three sets of recordings. The GAW was extracted and in total 50 vocal fold vibratory parameters representing different features of the GAW were computed. Statistical analyses using SPSS Statistics, version 21, was performed. 15 Parameters showing strong mathematical dependencies with other parameters were excluded from the main analysis but are given in the Supporting Information. Data analysis revealed clear influence of spatial resolution on GAW parameters. Fundamental period measures and period perturbation measures were the least affected. Amplitude perturbation measures and mechanical measures were most strongly influenced. Most glottal dynamic characteristics and symmetry measures deviated significantly. Most energy perturbation measures changed significantly in males but were mostly unaffected in females. In females 18 of 35 remaining parameters (51%) and in males 22 parameters (63%) changed significantly between spatial resolutions. This work represents the first step in studying the impact of video resolution on quantitative HSV parameters. Clear influences of spatial camera resolution on computed parameters were found. The study results suggest avoiding the use of the most strongly affected parameters. Further, the use of cameras with high resolution is recommended to analyze GAW measures in HSV data.

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Section: Introductionmentioning

confidence: 99%

Influence of spatial camera resolution in high-speed videoendoscopy on laryngeal parameters

et al. 2019

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“…The number of oscillation cycles considered might also play a role in HSV parameter variability, as seen before in acoustic signals [49]; for example, the studies discussed here reported between around 4 and 110 oscillation cycles.…”

Section: Limitationsmentioning

confidence: 59%

Laryngeal High-Speed Videoendoscopy: Sensitivity of Objective Parameters towards Recording Frame Rate

Schützenberger

Döllinger

Dubrovskiy

et al. 2016

BioMed Research International

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The current use of laryngeal high-speed videoendoscopy in clinic settings involves subjective visual assessment of vocal fold vibratory characteristics. However, objective quantification of vocal fold vibrations for evidence-based diagnosis and therapy is desired, and objective parameters assessing laryngeal dynamics have therefore been suggested. This study investigated the sensitivity of the objective parameters and their dependence on recording frame rate. A total of 300 endoscopic high-speed videos with recording frame rates between 1000 and 15 000 fps were analyzed for a vocally healthy female subject during sustained phonation. Twenty parameters, representing laryngeal dynamics, were computed. Four different parameter characteristics were found: parameters showing no change with increasing frame rate; parameters changing up to a certain frame rate, but then remaining constant; parameters remaining constant within a particular range of recording frame rates; and parameters changing with nearly every frame rate. The results suggest that (1) parameter values are influenced by recording frame rates and different parameters have varying sensitivities to recording frame rate; (2) normative values should be determined based on recording frame rates; and (3) the typically used recording frame rate of 4000 fps seems to be too low to distinguish accurately certain characteristics of the human phonation process in detail.

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“…Sci. 2018, 8, 2666 3 of 17 both can be influenced by different factors [34][35][36][37][38]. One of these factors is the recording frame rate, which was already investigated for acoustic and GAW signals.…”

Section: Introductionmentioning

confidence: 99%

“…Still, the application of recording frame rates of 4000 Hz in clinical studies was judged as justified, since the parameter changes between 4000 Hz and 15,000 Hz were relatively small for glottal dynamic characteristics and glottal perturbation characteristics. For acoustic signals, the stability of perturbation measures was investigated with deviating results [36][37][38]. Scherer et al suggested a minimal sequence length in the order of 100 cycles for the calculation of stable perturbation measures in the acoustic signal [36].…”

Section: Introductionmentioning

confidence: 99%

“…Another investigation was done for the electroglottographic (EGG) signal, which describes the electrical impedance between two electrodes placed on the left and right side of the larynx and changes with vocal fold vibration. The influence of different sequence lengths on EGG and audio was investigated and it was found that two of nine perturbation measures for the EGG signal and two of nine perturbation measures for the audio signal (although not the same measures) were affected by changing sequence lengths [38]. However, to the best of the authors' knowledge, no studies exist examining the influence of the analyzed interval length especially for GAW parameters computed from HSV data.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy

et al. 2018

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Laryngeal high-speed videoendoscopy (HSV) allows objective quantification of vocal fold vibratory characteristics. However, it is unknown how the analyzed sequence length affects some of the computed parameters. To examine if varying sequence lengths influence parameter calculation, 20 HSV recordings of healthy females during sustained phonation were investigated. The clinical prevalent Photron Fastcam MC2 camera with a frame rate of 4000 fps and a spatial resolution of 512 × 256 pixels was used to collect HSV data. The glottal area waveform (GAW), describing the increase and decrease of the area between the vocal folds during phonation, was extracted. Based on the GAW, 16 perturbation parameters were computed for sequences of 5, 10, 20, 50 and 100 consecutive cycles. Statistical analysis was performed using SPSS Statistics, version 21. Only three parameters (18.8%) were statistically significantly influenced by changing sequence lengths. Of these parameters, one changed until 10 cycles were reached, one until 20 cycles were reached and one, namely Amplitude Variability Index (AVI), changed between almost all groups of different sequence lengths. Moreover, visually observable, but not statistically significant, changes within parameters were observed. These changes were often most prominent between shorter sequence lengths. Hence, we suggest using a minimum sequence length of at least 20 cycles and discarding the parameter AVI.

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Influence of F0 and Sequence Length of Audio and Electroglottographic Signals on Perturbation Measures for Voice Assessment

Cited by 7 publications

References 36 publications

Influence of spatial camera resolution in high-speed videoendoscopy on laryngeal parameters

Influence of spatial camera resolution in high-speed videoendoscopy on laryngeal parameters

Laryngeal High-Speed Videoendoscopy: Sensitivity of Objective Parameters towards Recording Frame Rate

Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy

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