Voice production is a complicated function. It begins with respiration (breathing), and exhaling. Air is then pushed through the closed vocal cords via the windpipe (trachea). This causes vibration, which may be repeated hundreds or even thousands of times per second, producing a sound. The sound is then manipulated in the upper throat and oral cavity (including the lips, tongue, palate, and jaw) to create speech.
Videostroboscopy is a procedure which may be used to assess the anatomy and function of the larynx in detail to improve diagnosis and treatment of vocal problems.