Non-contact measurement of facial surface vibration patterns during singing by scanning laser Doppler vibrometer by Tatsuya eKitamura, Keisuke eOhtani

“…The objective of the experiment was to measure thevibration velocity differences between the modal and falsettoregisters while three professional soprano singers sang sustainedvowels at four pitch frequencies. …”
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Laryngeal evidence for the first and second passaggio in professionally trained sopranos. by Matthias Echternach, Fabian Burk, Marie Köberlein, Andreas Selamtzis, Michael Döllinger, Michael Burdumy, Bernhard Richter, Christian Thomas Herbst

“…Due to a lack of empirical data, the current understanding of the laryngeal mechanics in the passaggio regions (i.e., the fundamental frequency ranges where vocal registration events usually occur) of the female singing voice is still limited.In this study the first and second passaggio regions of 10 professionally trained female classical soprano singers were analyzed. The sopranos performed pitch glides from A3 (ƒo = 220 Hz) to A4 (ƒo = 440 Hz) and from A4 (ƒo = 440 Hz) to A5 (ƒo = 880 Hz) on the vowel [iː]. …”
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