(5) Affricates:


These are acoustically complex sounds. Voiceless affricates such as t S begin as plosives, so their initial portion is silence. After this, the closure in the vocal tract is released and we hear a fricative sound, which is aperiodic.

Voiced affricates (if they are really voiced) are accompanied by vocal fold vibration; as a result, the first part is periodic and the second part is a mixture of periodic and aperiodic.