Vliv odebrání mandlí modelovaný pomocí MKP na subjektivní hodnocení hlasu

Effects of FE Modelled Consequences of Tonillectomy on Perceptual Evaluation of Voice

článek ve sborníku ve WoS nebo Scopus

en

This study aimed to investigate the effects of a tonsillectomy on the perceived overall voice quality and timbre. Computer simulations of five Czech vowels were made, including both the calculated resonance effects of large tonsils (size 1.6 cm3) and the resonances without tonsils. The simulations were made using a finite element model of the vocal tract, based on magnetic resonance images. The size and shape of the tonsils were ascertained from clinical data. The generated pressure outputs were transformed into sound records presented to 10 trained listeners. Formant frequencies of the simulated samples were measured. The samples with and without tonsils did not differ significantly from each other in voice quality. F3 was significantly lower and the timbre was darker without tonsils. Thus, the effects of tonsillectomy on voice may be perceptible, at least in the case of large tonsils. The effect, however, may disappear in time due to changes in the tissue and due to compensatory changes in articulation.

Cílem tohoto příspěvku je hodnocení vlivu odebrání mandlí na celkovou kvalitu a zabarvení hlasu. Byla provedena počítačová simulace vyslovování pěti českých samohlásek na MKP modelu vokálního traktu získaného pomocí magnetické rezonanc pro stav s mandlemi a po odebrání mandlí (velké mandle – objem 1.6 cm3). Získané průběhy akustického tlaku byly převedeny na zvukové soubory a hodnoceny 10ti trénovanými posluchači. Záznamy samohlásek před a po odebrání mandlí se neliší co do kvality hlasu. U záznamů po odebrání hlasivek se výrazně snížil třetí formant a barva hlasu byla temnější. Vliv odebrání mandlí je tedy poslechem rozeznatelný, alespoň v případě velkých mandlí, ale tento efekt může časem odeznít vlivem změn tkáně po operaci a kompenzačními změnami ve výslovnosti.

This study aimed to investigate the effects of a tonsillectomy on the perceived overall voice quality and timbre. Computer simulations of five Czech vowels were made, including both the calculated resonance effects of large tonsils (size 1.6 cm3) and the resonances without tonsils. The simulations were made using a finite element model of the vocal tract, based on magnetic resonance images. The size and shape of the tonsils were ascertained from clinical data. The generated pressure outputs were transformed into sound records presented to 10 trained listeners. Formant frequencies of the simulated samples were measured. The samples with and without tonsils did not differ significantly from each other in voice quality. F3 was significantly lower and the timbre was darker without tonsils. Thus, the effects of tonsillectomy on voice may be perceptible, at least in the case of large tonsils. The effect, however, may disappear in time due to changes in the tissue and due to compensatory changes in articulation.

computer simulations, voice quality, timbre

2007

27.08.2007

ISCA-INST SPEECH COMMUNICATION ASSOC,

Antwerp, Belgium

978-1-60560-316-2

INTERSPEECH 2007: 8TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION

1182–1185

4