漢藏雙語(yǔ)合成語(yǔ)音音質(zhì)評(píng)測(cè)的研究
[Abstract]:Cross-language speech synthesis, which can synthesize different languages in the same speech synthesis system, has become a research hotspot in the field of speech signal processing. At present, Northwest normal University has implemented the bilingual phonetic synthesis system of Mandarin and Tibetan Lhasa dialect. In order to study the speech quality of different speakers in different languages synthesized by Chinese-Tibetan bilingual speech synthesis system, a Chinese-Tibetan bilingual cross-language speech synthesis system is implemented in this paper. On this basis, the sound quality of Chinese-Tibetan bilingual speech synthesized under different speech synthesis schemes is evaluated subjectively and objectively, and a method of speaker similarity and synthetic speech quality evaluation using speaker recognition and speech recognition is proposed. The main work and innovation are as follows: 1. A Chinese-Tibetan bilingual speech synthesis scheme is designed and a Chinese-Tibetan bilingual cross-language speech synthesis system is implemented. The phonetic corpus, text corpus, contextual attribute tagging format and context-related problem set of Chinese Putonghua and Tibetan Lhasa dialect are designed, and the acoustic model of Chinese-Tibetan bilingual speech is trained by the method of speaker adaptive training. Using vocoder to synthesize speech. 2. The phonological quality of Chinese Putonghua and Tibetan Lhasa dialect synthesized by different speech synthesis schemes was evaluated. Subjective evaluation method and objective evaluation method are adopted. Subjective evaluation methods include average opinion score, difference average opinion score, relative average opinion score and diagnostic rhyme test; objective evaluation methods include fundamental frequency parameter measurement, duration parameter measurement and perceptual speech quality evaluation. The results show that the quality of the synthesized Mandarin and Tibetan Lhasa dialect is higher than that of Tibetan Lhasa dialect when 110 Putonghua sentences and 300 Tibetan sentences are used to participate in speaker adaptive training. This paper presents a method to evaluate the speech similarity of different speakers in Chinese-Tibetan bilingual speech synthesis system by using speaker recognition technology. A speaker recognition system was trained by using Gao Si mixed model as acoustic model, combined with traditional short-time processing techniques and empirical mode decomposition to obtain acoustic features. The results show that the speaker recognition rate of synthesized speech is 88.89 when the Chinese Putonghua sentence in adaptive training is 110 sentences, and when 300 Tibetan sentences participate in adaptive training. The speaker recognition rate of synthetic speech is 94.44. 4. In this paper, a method for evaluating the sound quality of Chinese and Tibetan bilingual speech synthesis system based on speech recognition is presented. The continuous hidden Markov model with 5 states is used as the elementary acoustic model. The 13 D Mel frequency cepstrum coefficient and its first order difference and second order difference are used to form a 13 脳 3 dimensional eigenvector to train the acoustic model. The results show that the speech recognition rate of synthetic speech is 96.41 when the Putonghua sentence in speaker adaptive training is 110 sentences, and 91.27 when Tibetan language sentence is 300 sentences in adaptive training.
【學(xué)位授予單位】:西北師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN912.3
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