1. Periodic sound (examples: vowels; nasal consonants) 2. Aperiodic sound (example: fricative consonants) 3. A mixture of periodic and aperiodic sound (example: [z]) 4. Silence NEXT PAGE
2. Aperiodic sound (example: fricative consonants)
3. A mixture of periodic and aperiodic sound (example: [z])
4. Silence
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