关键词: 藏语语音合成, 确定性退火期望值最大化（DAEM）算法, 自动标注, 时间标注

Abstract: This paper introduces a Deterministic Annealing Expectation Maximum（DAEM） algorithm into the HMM-based Tibetan speech synthesis to label the time boundary of speech synthesis unit for non-labeled training speech corpus automatically. The initial and the final are used as the speech synthesis units. The DAEM algorithm is used for determining the optimal parameters of the embedded re-evaluation during the model training. The boundaries of speech synthesis units are obtained by a force alignment in acoustic model training of speech synthesis unit. Tests show that the unit boundary obtained by the proposed method is close to the manually labeled boundary. Subjective evaluation on quality of synthesized speech shows that the synthesized Tibetan speech is also similar to the synthesized speech with manually labeled speech corpus. Therefore, proposed method can be used for training acoustic modes of Tibetan speech synthesis with non-labeled training speech corpus.

Key words: Tibetan speech synthesis, Deterministic Annealing Expectation Maximum（DAEM） algorithm, automatically label, time label