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Voice projection is the strength of speakingorsinging whereby the human voice is used powerfully and clearly. It is a technique employed to command respect and attention, such as when a teacher talks to a class, or simply to be heard clearly, as used by an actor in a theatre or during drill.
Breath technique is essential for proper voice projection. Whereas in normal talking one may use air from the top of the lungs, a properly projected voice uses air properly flowing from the expansion of the diaphragm. In good vocal technique, well-balanced respiration is especially important to maintaining vocal projection. The goal is to isolate and relax the muscles controlling the vocal folds, so that they are unimpaired by tension. The external intercostal muscles are used only to enlarge the chest cavity, whilst the counterplay between the diaphragm and abdominal muscles is trained to control airflow.
A way to improve breathing from the diaphragm is to lie on your back on a flat surface. Your goal will be to fill your lungs from the bottom causing your stomach (and diaphragm) to rise and fall. To increase resistance put a small amount of weight (such as a book) on your diaphragm and repeat this exercise. Try standing up and seeing if you can continue to breathe from your diaphragm.
Stance is also important. Actors are taught to stand erect with the feet shoulder width apart and the upstage foot (foot farther from the audience, when not facing the audience) slightly forward. This improves balance and breathing.
Insinging, voice projection is often equated with acoustic resonance, the concentrated pressure through which one produces a focused sound. True resonance will produce the greatest amount of projection available to a voice by utilizing all the key resonators found in the vocal cavity. As the sound being produced and these resonators find the same overtones, the sound will begin to spin as it reaches the ideal singer's formant at about 2800 Hz. The size, shape, and hardness of the resonators all factor into the production of these overtones and ultimately determine the projective capacities of the voice.[1][2]
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