They try a plethora of techniques and train for years to achieve this goal. Yet, an easy technique for the amature is not widely know. In this research, singers were asked to sing the same note five times into a speaker that is connected to a computer. The computer system is the Science Interface System. The computer inputs the sound through a microphone and graphs the number of harmonics.
Harmonics are what make up the quality of a voice.
By seeing these graphs a person can determine which vowels they should use the most often to make their voice sound fuller. My results found that the more singing experience a person has, the fuller their voice sounds. There was a lot of desparity between each person's fullest vowel. Therefore everyone must be tested themselves if they want to know their fullest vowel. I conclud that a person must have singing experience, whether it is joining a choir or taking private lessons from a perfessional in order to make their voices fuller.