[Lin L]

However, “sounds better” can be attributed to many aspects. Thus, how can i ensure that “sounds better” here actually because of lower target cost?

Besides, what I still confused is how actually to measure the target cost. I find that, for the same diphone in different sentences, unit selection may choose from different sources. However, when checking Unit relation, I cannot tell what exactly their differences in linguistic aspect. But they indeed sounds better.

[Author]

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