音聲合成에서 聲門 MODEL이 音質에 미치는 影響 = The Effect of Glottal Model on the Quality of Speech Synthesis

다국어 초록 (Multilingual Abstract)

It is investigated how the pitch period, gain, and glottal wave influence the synthesized quality.
Speech sounds pronounced by a male are analyzed by an autocorrelation technique, and pitch periods and gains are obtained. In the synthesis of speech sounds, the effects of variations of the pitch periods and gains on the speech quality are recognized in terms of waveforms and listening.
There is little degradation in synthesized speech quality with some variation of pitch period, but much difference in the clearness and naturalness of speech with variations of gain pattern-approximations, However, it is possible to treat the variation of pitch period and that of gain respectively as piecewise linear approximations without degrading the speech quality.
Five Korean vowels are resynthesized by using a simulated glottal wave with nonimpulse shape, and it is tried to find the effect of opening time and closing time of the glottal wave on the speech quality.
Main results obtained are as follows:
1. It is confirmed that the glottal waves are different in waveshape depending on the kind of vowels /a, e, i, o, u/ by inverse filtering technique.
2. It is found that the synthesized speech quality is varied with the opening time and closing time of glottal wave.

목차 (Table of Contents)

• Ⅰ. 序 論
• Ⅱ. 聲門 model
• 1. 利得
• 2. Pitch period
• 3. 聲門波 推出
• 4. 聲門波形
• Ⅲ. 實驗 및 結果分析
• 1. 實驗
• 2. 結果 分析
• 가. Pitch period에 대한 影響
• 나. 利得에 대한 影響
• 다. 聲門波에 대한 影響
• Ⅳ. 結 論
• 參考文獻
• Summary