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A method of applying Fourier analysis to high-speed laryngoscopy
KTH, Superseded Departments, Speech, Music and Hearing.ORCID iD: 0000-0003-4129-9793
2001 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 110, no 6, 3193-3197 p.Article in journal (Refereed) Published
Abstract [en]

A new method for analysis of digital high-speed recordings of vocal-fold vibrations is presented. The method is based on the extraction of light-intensity time sequences from consecutive images, which in turn are Fourier transformed. The spectra thus acquired can be displayed in four different modes, each having its own benefits. When applied to the larynx, the method visualizes oscillations in the entire laryngeal area, not merely the glottal region. The method was applied to two laryngoscopic high-speed image sequences. Among these examples, covibrations in the ventricular folds and in the mucosa covering the arytenoid cartilages were found. In some cases the covibrations occurred at other frequencies than those of the glottis.

Place, publisher, year, edition, pages
2001. Vol. 110, no 6, 3193-3197 p.
Keyword [en]
VOCAL FOLD VIBRATIONS, MATHEMATICAL-MODEL, KYMOGRAPHY, CORDS
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-13262ISI: 000172731600037OAI: oai:DiVA.org:kth-13262DiVA: diva2:322975
Note
QC 20100609Available from: 2010-06-09 Created: 2010-06-09 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Computer methods for perceptual, acoustic and laryngoscopic voice analysis
Open this publication in new window or tab >>Computer methods for perceptual, acoustic and laryngoscopic voice analysis
2000 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2000. 9 p.
Series
Trita-TMH, 2000:12
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-1169 (URN)91-7283-013-1 (ISBN)
Note
QC 20100609Available from: 2001-07-17 Created: 2001-07-17 Last updated: 2010-06-09Bibliographically approved
2. Computer methods for voice analysis
Open this publication in new window or tab >>Computer methods for voice analysis
2003 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis consists of five articles and a summary. Thethesis deals with methods for measuring properties of thevoice. The methods are all computer-based, but utilisedifferent approaches for measuring different aspects of thevoice.

Paper I introduces the Visual Sort and Rate (VSR) method forperceptual rating of voice quality. The method is based on theVisual Analogue Scale (VAS), but simultaneously shows allstimuli as icons along the VAS on the computer screen. As thelistener places similar-sounding stimuli close to each otherduring the rating process, comparing stimuli becomeseasier.

Paper II introduces the correlogram. Fundamental frequencyF0 sometimes cannot be strictly defined, particularly forperturbed voice signals. The method displays multipleconsecutive correlation functions in a grey scale image. Thus,the correlogram avoids selecting a single F0 value. Rather itpresents an unbiased image of periodicity, allowing theinvestigator to select among several candidates, ifappropriate.

PaperIII introduces a method for detection of phonation tobe utilised in voice accumulators. The method uses twomicrophones attached near the subject’s ears. Phase andamplitude relations of the microphone signals are used to forma phonation detector. The output of the method can be used tomeasure phonation time, speaking time and fundamental frequencyof the subject, as well as sound pressure level of both thesubject’s voicing and the ambient sounds.

Paper IV introduces a method for Fourier analysis ofhigh-speed laryngoscopic imaging. The data from the consecutiveimages are re-arranged to form time-series that reflect thetime-variation of light intensity in each pixel. Each of thesetime series is then analysed by means of Fouriertransformation, such that a spectrum for each pixel isobtained. Several ways of displaying these spectra aredemonstrated.

Paper V examines a test set-up for simultaneous recording ofairflow, intra-oral pressure, electro-glottography, audio andhigh-speed imaging. Data are analysed with particular focus onsynchronisation between glottal area and inverse filteredairflow. Several methodological aspects are also examined, suchas the difficulties in synchronising high-speed imaging datawith the other signals.

Place, publisher, year, edition, pages
Stockholm: KTH, 2003. 22 p.
Series
Trita-TMH, 2003:2
Keyword
voice analysis, perceptual analysis, fundamental frequency, correlogram, aperiodicity, Fourier analysis, high-speed imaging, laryngoscopy, vocal fold vibration, voice accumulation.
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-3485 (URN)91-7283-461-7 (ISBN)
Public defence
2003-03-28, 00:00
Note
QC 20100609Available from: 2003-03-21 Created: 2003-03-21 Last updated: 2010-06-09Bibliographically approved

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