The phonation stage is controlled by the laryngeal muscles, which are responsible for opening and closing the vocal cords. The rate at which the vocal cords vibrate determines the pitch of the voice, while the amount of air that passes through the vocal cords determines the loudness of the voice.
The phonation stage is essential for speech production, as it is responsible for generating the sound waves that are used to create speech sounds. Without the phonation stage, we would not be able to speak.
Here is a more detailed explanation of the phonation stage:
1. Laryngeal muscles contract. The laryngeal muscles contract to bring the vocal cords closer together, narrowing the opening between them. This creates a build-up of air pressure below the vocal cords.
2. Vocal cords vibrate. The build-up of air pressure below the vocal cords causes them to vibrate. This vibration produces sound waves, which travel through the vocal tract and out of the mouth.
3. Resonators shape the sound waves. The shape of the vocal tract, including the mouth and nose, acts as a resonator, shaping the sound waves produced by the vocal cords. This allows us to produce different vowel and consonant sounds.
The phonation stage is a complex process that involves the coordination of several different muscles and structures. However, it is an essential part of speech production, and without it, we would not be able to speak.