XiaoiceSing: A High-Quality and Integrated Singing Voice Synthesis System
Table 1: Mean opinion scores (MOS) test results
['[BOLD] Evaluation Item', '[BOLD] Recording', '[BOLD] XiaoiceSing', '[BOLD] Baseline']
Specifically, XiaoiceSing attains a MOS score of 4.32 on pronunciation accuracy, which is close to 4.79 of recording, and 1.18 over baseline. On sound quality and naturalness, XiaoiceSing also achieves a gain of 1.44 and 1.38 over baseline respectively. Although MOS score of XiaoiceSing drops down below 4.0 on these two items, it is likely due to some deficiencies of WORLD or higher expectations of listeners. Additionally, XiaoiceSing has less standard deviations on MOS than baseline, which may indicates that self-attention mechanism brings about the better performance stability among all test cases.