They produce a significant increase in air pressure inside the mouth compared to the surrounding air. Obstruent vs. Sonorant
Air is blocked completely and then released (e.g., /p, b, t, d, k, g/). obstruent
Obstruent vs. Sonorant Consonants in Phonetics ... - Facebook They produce a significant increase in air pressure
They are marked by the presence of noise or silence during the constriction phase. obstruent
Obstruents frequently occur in pairs—one voiced (vocal folds vibrate) and one voiceless (no vibration)—such as /s/ vs. /z/ or /t/ vs. /d/.