The human voice could be considered the earliest musical instrument. Similar to how no two human bodies are the same, no two voices have the same timbre and sound quality. Humans use the vocal tract to produce sounds such as talking, singing, laughing, sobbing, screaming, shouting, or yelling. The vocal folds, or vocal cords, are the fundamental sound source in human voice frequency. 

We can consider the human voice as two distinct instrument types: a wind instrument and a string instrument. Respiratory elements, corresponding to the wind instrument type, include the trachea, bronchi, lungs, diaphragm, rib cage, and intercostal muscles. All organs fulfill a role in the entry and departure of air from the body.

Vocal components, corresponding to the string instrument type, actually generate the vocal sound. The voice is produced at a single location in the larynx: the vocal cords. In particular, it’s produced in the gap between them, the glottis. Through it, the air must pass on its way back to the outside, exerting more or less pressure and causing the vocal cords to vibrate and generate sound. Just before going outside, the sound gets one of its most distinguishing characteristics: the timbre. This distinguishes each voice. Furthermore, supraglottic cavities enhance the sound’s resonance. This procedure involves the palate, tongue, lips, and even the teeth. 

Resonance phenomenon of the human voice

Singers can also improve their vocal tract resonance by learning to project sound in certain ways. Vocal resonance is the term for this phenomenon. The function of the larynx, which humans may control in various ways to generate different sounds, has another important effect on vocal sound and production.

Different types of vocal registers describe the various types of laryngeal function. The primary method for singers to accomplish this is through the use of the Singer’s Formant. This resonance complements the normal resonances of the vocal tract above the frequency range of most instruments. It enables the singer’s voice to carry better over musical accompaniment.

The system of vocal registers in the human voice has the title of vocal register. A register corresponds to a set of tones produced by the vocal folds in the same vibratory pattern and with the same quality in the human voice. The laryngeal function is where registers begin. They occur as a result of the vocal folds’ ability to produce a variety of vibratory patterns. These vibratory patterns appear within a certain pitch range in the vocal range and create distinct sounds.

The consequences of the acoustic interaction between the vocal fold oscillation and the vocal tract also link to the development of registers. According to research published in the New Scientist, the twelve-tone musical scale, on which especially western popular music is based, may have its origins in the sound of the human voice during evolution. Peaks in acoustic energy appeared in recorded speech samples that corresponded to the lengths between notes in the twelve-tone scale.