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- Uloza, Virgilijus, et al.
(författare)
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Combined Use of Standard and Throat Microphones for Measurement of Acoustic Voice Parameters and Voice Categorization
- 2015
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Ingår i: Journal of Voice. - Philadelphia, PA : Elsevier. - 0892-1997 .- 1873-4588. ; 29:5, s. 552-559
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Tidskriftsartikel (refereegranskat)abstract
- Summary: Objective. The aim of the present study was to evaluate the reliability of the measurements of acoustic voice parameters obtained simultaneously using oral and contact (throat) microphones and to investigate utility of combined use of these microphones for voice categorization.Materials and Methods. Voice samples of sustained vowel /a/ obtained from 157 subjects (105 healthy and 52 pathological voices) were recorded in a soundproof booth simultaneously through two microphones: oral AKG Perception 220 microphone (AKG Acoustics, Vienna, Austria) and contact (throat) Triumph PC microphone (Clearer Communications, Inc, Burnaby, Canada) placed on the lamina of thyroid cartilage. Acoustic voice signal data were measured for fundamental frequency, percent of jitter and shimmer, normalized noise energy, signal-to-noise ratio, and harmonic-to-noise ratio using Dr. Speech software (Tiger Electronics, Seattle, WA).Results. The correlations of acoustic voice parameters in vocal performance were statistically significant and strong (r = 0.71–1.0) for the entire functional measurements obtained for the two microphones. When classifying into healthy-pathological voice classes, the oral-shimmer revealed the correct classification rate (CCR) of 75.2% and the throat-jitter revealed CCR of 70.7%. However, combination of both throat and oral microphones allowed identifying a set of three voice parameters: throat-signal-to-noise ratio, oral-shimmer, and oral-normalized noise energy, which provided the CCR of 80.3%.Conclusions. The measurements of acoustic voice parameters using a combination of oral and throat microphones showed to be reliable in clinical settings and demonstrated high CCRs when distinguishing the healthy and pathological voice patient groups. Our study validates the suitability of the throat microphone signal for the task of automatic voice analysis for the purpose of voice screening. Copyright © 2014 The Voice Foundation.
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| 2. |
- Uloza, Virgilijus, et al.
(författare)
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Swedish-Lithuanian telemedicine Litmed project in otolaryngology
- 2003
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Ingår i: International Congress Series. - 0531-5131. ; 1240, s. 1407-1410
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Tidskriftsartikel (refereegranskat)abstract
- Telemedicine is becoming a reality as a result of improvements in technology and telecommunications. The task of the otolaryngological part of the pilot international telemedicine Litmed project was devoted to the establishment of telemedicine training and demonstration facilities in cooperation between the Departments of Otolaryngology of the Kaunas University of Medicine (Lithuania) and the Lund University (Sweden). The main areas of action of the Litmed project in otolaryngology were: (1) remote rehabilitation of cochlear implant (CI) patients, and (2) phonosurgery and phoniatrics. The main results of the project were as follows: (a) establishment of telemedicine environment for remote on-line collaboration and planned off-line collaboration by use of recorded video laryngostroboscopic images, voice samples, and graphical and computed tomography (CT) data; (b) possibility to carry through telemedicine sessions for pedagogical and speech training support and for cooperative work of speech therapists from Lund and Kaunas with CI patients; (c) remote consultations and discussion of challenging laryngeal cases; and (d) establishment of a technical environment and practical routines for on-line consultations during laryngeal surgery at the Departments of Otolaryngology of Kaunas and Lund. The Litmed project served to assist medical education and research. Tele-otolaryngology helps to keep constant professional contacts with the specialists from abroad and supports an establishment of a center of reference in tele-otolaryngology in Lithuania.
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