Accuracy

continuity and stability are the main problems in speech pitch analysis.In this paper

a new Mandarin pitch contour estimation methodlogy is proposed.First

AMDF is substituted by LVAMDF （Length Varied AMDF）for higher accuracy and better time resolution.Second

the concept of Vowel Clarity is introduced according to the characteristics of Mandarin speech signals.Based on LVAMDF and Vowel Clarity

a series of methodologies are developed

including Vowel Center Location

Multi period to Single period Pitch Adjustment

Pitch Neighborhood Searching

etc.

which has gained much higher accuracy

continuity and stability than standard Mandarin pitch estimation methods.