On the Second Format Target Frequency of the Stop Consonant

概要

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Since the F_2 locus of the stop consonant has been defined on the basis of speech synthesis, it may be questioned that the F_2 locus does not neccessarily agree with the real articulation of the phoneme. Therefore instead of the F_2 locus, we will name the second formant frequency corresponding to the target configuration as the target frequency of second formant, and mention an attempt to find it. That is, as for the stop consonant-vowel syllable, let the target configurations of each be S_1,S_2 and n be the normalized time and the area function during the transition S be S^<1/3>=(S_1)^<1/3>+((S_2)^<1/3>-(S_1)^<1/3>)・n, then we also get a good approximation of F_2=(F_2)^1+((F_2)^2-(F_2)^1)・n, among the second formant frequencies (F_2)^1,(F_2)^2 and F_2 corresponding to S_1,S_2 and S respectively. Therefore if we find F_2 and (F_2)^2 we can calculate the second formant frequency of the stop consonant (F_2)^1. The target frequency defined in this way can be considered to be reasonable enough, and moreover if we make use of this, we will be able to express more easily the effect of the co-articulation on the second formant frequency.
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