Abstract
When a speaker speaks, the vocal fold oscillates, generating a voice. The voice resonating in the vocal tract and in the mouth is converted to speech when the speaker changes the shapes of the mouth and tongue. When the vocal fold oscillates, a voice is generated because the vocal fold oscillation vibrates the air in succession, and the vocal fold oscillation triggers the generation of the fundamental frequency of the vocal fold as well as that of the harmonic sound at the same time. It is not easy to understand these sound generation principles acoustically, however, unless one is equipped with deep knowledge in the fields of physics and acoustics. In this paper, therefore, the vocal fold will be simplified as a multi-mass model, and a way to easily understand the principle that the fundamental frequency and harmonic sound are generated simultaneously by vocal fold oscillation will be presented.
Highlights
The sound wave is usually propagated by air and is dissipated through viscous damping
The vocal fold oscillates with numerous harmonics, and it is easy to understand its oscillation mechanism when vocal fold oscillation is compared with the oscillation of the multi-mass models of numerous harmonics
The vocal fold oscillates to vibrate the surrounding air and generate sound, and the sound is propagated outside the mouth after being resonated in the vocal tract and mouth
Summary
The sound wave is usually propagated by air and is dissipated through viscous damping. Their study, a helix structure was proposed to achieve low frequency acoustic energy harvesting. When beginners in acoustics and phonetics and non-majors in physics start to study acoustics, they do not know the principle of the generation of harmonics that, when the vocal fold or guitar strings generate sound, they simultaneously generate the basic frequency voice and the harmonic sound. This principle, is the basics of acoustics and it is very important but difficult to understand. While the voice is being resonated in the vocal tract and mouth, the speaker changes the resonance condition by changing the shapes of his or her mouth and tongue to form various consonants and vowels.
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