Exam Question Checklist

Exam 1998 Question 3

" Describe how the Laryngograph operates. Relate characteristics of the Laryngograph signal to the actions of the vocal folds in modal, creaky and falsetto voice."

20 things you should mention:

• Laryngograph
  • electrode placement
  • monitoring of current flow / impedance
  • relate current flow to vocal fold contact area
    • diagram
  • Lx waveform
• Modal
  • Lx graph modal voice
    • rapidity of closure
    • regularity
    • long closed / short open phase
  • vocal fold cycle: closed: vf across airway
    • opening: push apart
    • open: max air flow, recoil
    • closing: bernoulli effect, 'snap'
• Creaky
  • Lx graph creaky voice
    • lack of tension / low frequency
    • small air flow / long closed phase
    • irregularity
• Falsetto
  • Lx graph falsetto
    • very high tension, high frequency
    • small amplitude