[Study on the nasal resonance]

Area of Science:

• Acoustic science
• Human physiology
• Speech science

Background:

• The human body utilizes resonant organs for sound production.
• The nasal cavity and its sinuses are recognized as significant resonant organs.
• Understanding the specific contribution of nasal structures to resonance is crucial for acoustics and speech science.

Purpose of the Study:

• To investigate the resonant function of the nasal cavity, including nasal sinuses.
• To determine the role of the anterior nasal cavity in vocal resonance.
• To analyze acoustic parameters of vowels before and after nasal cavity modification.

Main Methods:

• Acoustic analysis of five standard vowels ([a], [e], [i], [o], [u]).
• Measurement of maximum frequency, mean frequency, and harmonic content.
• Comparison of acoustic parameters before and after packing the anterior nasal cavity.

Main Results:

• Statistical analysis revealed no significant differences in acoustic parameters.
• Vowel frequency (maximum and mean) remained unchanged.
• The number of harmonics did not show significant variation after nasal packing.

Conclusions:

• The anterior portion of the nasal cavity does not play a critical role in nasal resonance.
• The findings suggest that other anatomical structures are more influential in nasal resonance.
• This study clarifies the limited contribution of the front nasal area to vocal sound modification.