The relevance between the voice and the nasal cavity

Beginning with observing form and mechanics, let’s have a brief overview of the resonance chamber, which is near the vocal folds 1:laryngeal ventricle 2: piriform recess 3:pharyngeal cavity 4:oral cavity 5:nasal cavity.
The voice is made in the resonance chamber.
The distance is very short between the external nostril and the oral cavity. The nasal cavity area itself is a large space, and comparable to the size of the inferior concha. There is a relevant connection between the voice and the nasal cavity.
The nose and nasal cavity both play many important roles in our everyday life functions. The most vital role is to send air (breathing) with humidity to the lungs. This action also can alter the temperature of air that enters the body from the outside, by warming cold air as well as chilling hot air.
The nose also prevents dust from entering the body, blocking it with our natural nose hairs.
The nose affects producing a good or bad voice, depending on the angle of the path for airflow. A clear path is often most desirable, but many singers with a nasal type sounding voice have used that as a trademark sound.
The nose holes usually face toward the ground, in which the air enters. After the air enters, it turns at a right angle to head to the epipharynx, then it turns at right angle again to go to lungs passing through the pharynx and the vocal fold. (Figure 2).
This process also prevents lungs from becoming dry, due to humidity in the air we breathe.
The process of voice production uses air being exhaled, going outside through the opposite way in which the airflow entered.
When the voice is travelling through the nasal cavity, a slight turning (due to a curve shape) happens, which makes a positive influence on the voice.
This is also same concept as when there are structures on the ceiling or wall in concert hall. These structures or masses diffuse, direct and even reflect sound.
I have tested and ran a survey, comparing the sound production of air entering and turning to exit at different angles. I used two identical in size vinyl pipes (diameter is 2 inches and total length is 35 inches) with one pipe being bent (Figure 1:A) and the other being straight(Figure1:B). The study began with playing music into one side, and participants listening/observing the sound that exited from the other side.
Survey results concluded that the bent pipe’s sound was better.
Five people participated in this study, and all of them had the same opinion.
The bent pipe’s angle mimicked the space of the nasal cavity. Therefor I have determined that the air pathway’s angle is relevant to a good voice.

e01
e02

Note:Sound is not transferred or even made without air/airflow, especially the human voice.

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