It is known, that wind instruments, drums and violins of a smaller volume make a higher sound that instruments of larger volume (Fig.4.). On the basis of this cognition, an idea arose to determine the type of voice, taking as a base a volume of an organ of sound forming.
For an opera and concert singers it is important to differentiate precisely voice categories, because they have to fill large halls with their voice. If they are qualified in the false voice type, their power to fill halls with voice reduces. When a vocalist sings by force in the unsuitable voice category, it results in voice damages and even absolute loss of voice(2,5).
It is particularly difficult to determine a voice type of vocalists-beginners and less developed voices, because a diapason of voice is not entirely developed yet.
In vocal art it is difficult to determine the exact type of the human voice (tenor, baritone, bass or soprano, mezzosoprano, alto(Tab.1)). Up to now it has been considered that the type of the human voice should be determined by vocal teacher and the phoniatrician(1,2,5).
Scale of the range of tones of the human voice. A vocalist often develops his voice in an unsuitable tessitura for a longer period of time. As a result, his voice is damaged and no improvement is achieved. In certain cases vocalist sings in an unsuitable group of voice for 3–4 years, during which be often over fatigues his voice and doesn’t achieve desirable results. Sometime because of this reason vocalist has to leave the professional singing. Therefore it is very important to determ
ine the type of a human voice in the beginning of singers career.
THE AIM OF RESEARCH
The aim of the research is to determine the type of the human voice on the basis of differences in the measurements of the volume of the larynx, the trachea, the big bronchial tubes for different vocal groups. MATERIALS AND METHODS
Has been used the XIMATRON CX simulator equipped with image digital convertor to DIKOM(Fig.1.).
T Fig.1.XIMATRON CX simulator he picture of the larynx, the trachea and the big bronchial tubes is transmitted to the monitor of the computer. The doctor has only to mark the borders of these anatomical structures, by using the mouse of the computer(Fig.2.,Fig.3.), and the computer has special programs, by which calculations are carried out. Procedure takes approximately 5 minutes. Borders of anatomical structures in our research were approved by consilium, which consisted of 3 radiologists, 2 otorhinolaryngologists and 1 medical physicist.
Fig.2. Tenors rtg
uring the research 15 vocalists – professional opera singers – all of them are soloists of Latvian National Opera – 5 tenors,
5 baritones, 5 basses were investigated. Singers willingly agreed to participate in this research, because a part of them at the beginning of their career also had problems with determination of the type of voice.
The results of the investigation show that there is a connection between the type of the human voice and the volume of the larynx, the trachea, and the big bronchial tubes. The difference in the volume of larynx of these voices groups varies on average – tenor – 1,87cm3, baritone – 5,32 cm3, bass – 11,35 cm3(Fig.5.)and the difference in volume of larynx, the trachea and the big bronchial tubes together varies on average – tenor – 136,6 cm3, baritone – 157,0 cm3, bass 196,3 cm3(Tab.2.).
P – probable error (lectures elementary statistics and probability by Dereck J. Hudson, Geneva, 1964)
This research has shown that a volume of the trachea and of the big bronchial tubes of dramatic tenor (N.1) is larger than that of lyrical tenors (N.2–5).