Tonal coarticulation patterns in quadrisyllabic words and phrases with normal stress of mandarin

Quadrisyllabic words and phrases with normal stress of Mandarinwere used to study the tonal coarticuation.It was firstly found that the Fperturbation at the starting—point and the ending—point of the Fcurve ineach syllable caused by tonal coarticulation is larger than the intrinsic Fdif-ference of vowels at the starting—point and the ending—point of it.As for thetonal coarticulation,it was discovered that tonal coarticulation in word andphrase with normal stress is different to that in the nonsense sequence with evenstress,and in word and phrase with normal stress,the tonal coarticulatory ef-fects are unidirectional,and the carryover effect does not extend to theending—point of tone—section of the following syllable and the anticipatory ef-fect does not extend to the starting-point of tone-section of the preceding one,and the Fperturbation by tonal coarticulation has its pattern.