One of the most significant differences between male and female vocalizations in the larynx is that males have more fricative (fricative in English means “faint, weak” in Latin) sounds than females. Fricative sounds occur when the mouth is open and the air entering the mouth is a relatively high frequency (between the frequency of the lower and higher vowels in the speech of the animal). Fricative sounds occur not only in English, but also in most languages and languages spoken by people who speak German. Fricative sounds occur in English because the vocal tract is designed for them. It is a tube connecting the tip of the tongue of the vocal tract with the lower jaw of the animal. If one does not have the ability to have the tube open, a fricative sound would not occur. This is why English fricatives occur in English, and other languages that are spoken by German.
A female’s fricative sounds occur when the mouth is closed and the air enters within the mouth from one or both of two directions.
An example of fricative sounds in the mouth
In most languages, the word for ‘yes’ is ‘s.’ When speaking a specific sentence, some people will say ‘yes.’ Others will say ‘yes’, and others will say ‘no.’ Therefore, if someone says ‘yes,’ and you ask ‘why?’ they will say ‘why.’ For a female to say ‘yes,’ and another ‘no,’ they both have to have the same kind of tube (their tongue closes on the lower jaw).
In male and female voices, the tongue closes on the lower jaw. This causes a ‘narrow’ tube to protrude through the upper palate. This tube, termed the oral cavity, is smaller and smaller as the female vocal tract grows longer and longer. The vocal tract at the end of the mouth is shorter than the one at the beginning of the mouth, therefore, the vocal tract must expand (grow) or contract to expand air. For males, the mouth becomes narrower (and shorter) just before they are sexually mature and begins to close again as they age. For females their mouths are narrower after puberty. For example, a young person can begin making a “froggy” sound with their mouth closed but begin to make a “moony” sound with their mouth open.
Another type of fricative sound in the mouth is a bony or vibrato sound. The bony (
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