I am studying speech recognition by Lawrence Rabiner's book. I am unable to find a proper and easy to understand answer for the following question :
Difference between production of vowels, diphthongs and semi-vowels
The author has just stated a single statement about their difference like
Vowels : Vowels are produced by exciting fixed vocal tract with quasi-periodic pulses of air caused by vibration of vocal cord
Diphthongs : Produced by varying the vocal tract smoothly between vowel configuration appropriate to diphthongs
Semi-Vowels : Characterized by a gliding transition in vocal tract area function between adjacent phonemes.
Can I get some more points ?