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• Teeth: The upper front teeth are used in the production of sounds like /f/ and /v/,
where the lower lip comes in contact with the upper teeth. The tongue can also
touch the teeth to produce dental sounds like /θ/ (as in "thin").
• Alveolar Ridge: This is the bony ridge behind the upper front teeth. The tongue
touches this area to produce alveolar sounds such as /t/, /d/, and /n/.
• Hard Palate: The hard palate is the bony part of the roof of the mouth, located
behind the alveolar ridge. The tongue touches the hard palate to produce palatal
sounds, such as the sound /j/ in "yes."
• Uvula: Located at the back of the soft palate, the uvula can contribute to certain
sounds, especially in languages like French, where it produces a uvular trill sound.
4. The Nasal Cavity
The nasal cavity plays a role in producing nasal sounds, such as /m/, /n/, and /ŋ/ (as in
"sing"). When the velum (soft palate) is lowered, air passes through the nasal cavity, and the
sound resonates there.
Stages of Speech Production
To summarize how these systems work together, let’s look at the stages of speech
production:
1. Breathing (Respiration): The diaphragm contracts, causing air to enter the lungs. As
we begin to speak, the diaphragm relaxes, and air is pushed out of the lungs, through
the trachea, and toward the vocal cords in the larynx.
2. Phonation (Sound Production): In the larynx, the vocal cords vibrate as the air
passes through them, producing a basic sound. The pitch and loudness of the sound
are controlled by the tension and movement of the vocal cords.
3. Resonance and Articulation: The sound produced by the vocal cords is then shaped
by the articulators (tongue, lips, teeth, hard and soft palates) to produce distinct
speech sounds. The position and movement of the articulators determine the quality
of the sounds we hear in speech.
Types of Speech Sounds
• Vowels: Vowels are produced when the airflow from the lungs is unobstructed. The
tongue and lips shape the sound, but there is no closure or narrowing that
significantly impedes the flow of air. The position of the tongue (high, mid, low) and
the shape of the lips (rounded or unrounded) affect the quality of vowel sounds.
• Consonants: Consonants are produced when the airflow is either fully or partially
blocked at some point in the vocal tract. The specific place where the obstruction
occurs and the manner in which it is blocked or constricted (e.g., stopping, fricative,
affricate) determine the type of consonant sound.