HIS 120 Air Flow and the Speech Mechanism

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  • 1. AIR FLOW & SPEECH MECHANISM The two components of lung volume capacity are:1. Expiratory relaxation pressure2. Expiratory muscle effort
  • 2. AIR FLOW & SPEECH MECHANISM Passive expiratory forces (relaxation pressure) and supplementary expiratory muscle effort are often required for complete phonation of many phonemes.
  • 3. AIR FLOW & SPEECH MECHANISM Air flow from the lungs comes up through the trachea and is modified by the vocal folds of the larynx for phonation.
  • 4. AIR FLOW & SPEECH MECHANISM The air continues to be modified through the larynx, then the articulators (the tongue, lips, and teeth), and the soft and hard palate with resonances of the nasal cavity for phonation. Ref. Zemlin pg #89
  • 5. AIR FLOW & SPEECH MECHANISM About half of the air required for phonation is inhaled into the lungs. This is about the same amount of air inhaled during normal/quiet inhalation. Note: Normal respiratory rate is about 12 breaths per minute.
  • 6. AIR FLOW & SPEECH MECHANISM Speech requires an energy source (the air from the lungs) Speech requires a vibrating element (the vocal folds of the larynx)
  • 7. AIR FLOW & SPEECH MECHANISM Fundamentally, in speech production you have:1. Fricative noise (air stream through the larynx become turbulent)2. Plosive sound (momentary blockage and release of air flow by the larynx)
  • 8. AIR FLOW & SPEECH MECHANISM Let’s review the diagrams in Zemlin pages 31 and 89.
  • 9. AIR FLOW & SPEECH MECHANISM Articulation to Audition The sound energy produced through articulation/phonation must be received with a minimum audible pressure at the eardrum in order to have an opportunity for auditory reception and processing to occur.
  • 10. AIR FLOW & SPEECH MECHANISM Articulation to Audition The sound energy produced through articulation/phonation must be received with a minimum audible pressure at the eardrum in order to have an opportunity for auditory reception and processing to occur.