THE VOWEL SPACE

• Each fundamental speech sound can be categorized according to the position of the articulators. This is often known as the study of Acoustic Phonetics.
  
  
  
• We can characterize a vowel sound by the locations of the first and second spectral resonances, known as formant frequencies:
  
  
  
• Some voiced sounds, such as diphthongs, are transitional sounds that move from one vowel location to another.