The rate of vibration in vocal cords is increased by more air pressure from the lungs. In an overwhelming majority of syllables that are stressed, a higher pitch is observed. Therefore, loudness to a certain extent contributes to the make-up of pitch. That is, higher pitch is heard louder than lower pitch. Further, syllable length tends to contribute to the perception of the utterance-final tonic stress more than pitch because of the natural decline of speech force as it comes to conclusion, contrary to acoustic facts (Levis, 1999:42).
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