his paper proposes an English lexical stress detection approach using acoustic features. The approach classifies the vowels of English words into two patterns: primary stress and unstress. We firstly choose the frame-averaged basic feature set of the individual syllable nucleus in polysyllabic words as the baseline to decide the stress pattern. This feature set includes the semitone, the duration, the loudness and the emphasis feature. Furthermore, we introduce the pitch-variation feature set and the context-aware feature set to describe the inside variation characteristic and outside contextual characteristic of the syllable nucleus. By combining the three feature sets, the accuracy rate is improved by 7%
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