Direct Evaluation of High-Speed Recordings of Vocal Fold Vibrations

240

127

Auditory-perceptual evaluation is the most commonly used clinical voice assessment method, and is often considered a gold standard for documentation of voice disorders. This view has arisen for many reasons, including the fact that voice quality is perceptual in nature and that the perceptual characteristics of voice have greater intuitive meaning and shared reality among listeners than do many instrumental measures. Other factors include limitations in the validity and reliability of instrumental methods and lack of agreement as to the most sensitive and specific instrumental measures of voice quality. Perceptual evaluation has, however, been heavily criticised because it is subjective. As a result, listener reliability is not always adequate and auditory-perceptual ratings can be confounded by factors such as the listener’s shifting internal standards, listener experience, type of rating scale used and the voice sample being evaluated. This paper discusses these pros and cons of perceptual evaluation, and outlines clinical strategies and research approaches that may lead to improvements in the assessment of voice quality. In particular, clinicians are advised to use multiple methods of voice quality evaluation, and to include both subjective and objective evaluation tools.

Section: Unresolved Research Questions and Promising Directionsmentioning

confidence: 99%

Auditory-Perceptual Evaluation of Disordered Voice Quality

Oates

2009

240

127

“…However, due to violation of the Shannon sampling theorem, stroboscopy is not suitable for the investigation of aperiodic transient vocal fold movements including irregularities or short-time pitch variations [5,6] . Observation of aperiodic movements needs real-time recording techniques, the most advanced technique being digital high-speed glottography [5,7] . Current systems are capable of recording up to 10,000 video frames/s.…”

Section: Introductionmentioning

confidence: 99%

“…Current systems are capable of recording up to 10,000 video frames/s. In particular, they are suited to analyse non-stationary effects occurring in a large variety of physiological voice phenomena and voice disorders [6][7][8][9] . Recently, a pitch rise paradigm was investigated using a high-speed video system.…”

Section: Introductionmentioning

confidence: 99%

The Pitch Rise Paradigm: A New Task for Real-Time Endoscopy of Non-Stationary Phonation

Rasp¹,

Lohscheller²,

Doellinger

et al. 2006

As standard stroboscopy is restricted to the recording of periodic vocal fold vibrations, observations of non-stationary laryngeal mechanisms demand real-time recording systems, the most advanced being the high-speed video technique. It allows the registration of laryngeal parameters during a variation of the fundamental frequency. The aim of this study was to compare amplitude and frequency parameters of vocal fold vibration during stationary and non-stationary phonation, i.e. a monotonous pitch rise. Twenty-nine young female adults with no incidence of voice disorders were examined while performing two different phonation tasks: sustained phonation with a constant frequency and a monotonous pitch rise. Endoscopic recordings and the acoustic signals were acquired simultaneously. Both acoustic and laryngeal parameters were derived for short time intervals of 17.8 ms for the constant pitch and pitch rise conditions. Instantaneous frequency, sound pressure level, vibratory amplitudes of the vocal folds and the type of glottal closure were compared. At the beginning of the pitch rise, the acoustic and laryngeal parameters were similar to the parameters that occurred within the sustained phonation conditions. In contrast, the laryngeal parameters at the middle and at the end of the pitch rise differed substantially from those during sustained phonation. For the first time, quantitative measures of the growing glottal chink and the vibration amplitude decrease during pitch increase could be taken. In general, the image evaluation of the pitch rise paradigm can be subdivided into the starting, the raising and the final phase. As each phase can be considered as quasi-stationary, existing software modules are capable of analysing the process by treating each phase separately. Hence, the pitch rise condition may be suitable for clinical examination to detect information of voice disturbances that cannot be visualized during sustained phonation.

“…Thus, many patients cannot benefit from the technology of stroboscopy even though it is considered the current 'gold standard' for laryngeal imaging. Another restriction to the use of stroboscopy is the difficulty in classifying functional voice disorders when it is the sole assessment technique used [2] . The third restriction limits scientific and diagnostic knowledge of the onset and offset of vibration.…”

mentioning

confidence: 99%

Clinical Implementation of Laryngeal High-Speed Videoendoscopy: Challenges and Evolution

Deliyski

Petrushev

Bonilha

et al. 2007

160

143

High-speed videoendoscopy (HSV) captures the true intracycle vibratory behavior of the vocal folds, which allows for overcoming the limitations of videostroboscopy for more accurate objective quantification methods. However, the commercial HSV systems have not gained widespread clinical adoption because of remaining technical and methodological limitations and an associated lack of information regarding the validity, practicality, and clinical relevance of HSV. The purpose of this article is to summarize the practical, technological and methodological challenges we have faced, to delineate the advances we have made, and to share our current vision of the necessary steps towards developing HSV into a robust tool. This tool will provide further insights into the biomechanics of laryngeal sound production, as well as enable more accurate functional assessment of the pathophysiology of voice disorders leading to refinements in the diagnosis and management of vocal fold pathology. The original contributions of this paper are the descriptions of our color high-resolution HSV integration, the methods for facilitative playback and HSV dynamic segmentation, and the ongoing efforts for implementing HSV in phonomicrosurgery, as well as the analysis of the challenges and prospects for the clinical implementation of HSV, additionally supported by references to previously reported data.