FastSpeech 2: Fast and High-Quality End-to-End Text to Speech
Table 3: The mean absolute error of the pitch and energy in synthesized speech audio.
['Method', 'Pitch', 'Energy']
To verify whether providing more variance information (e.g., pitch and energy) as input can indeed synthesize speech with more accurate pitch and energy, we compare the accuracy of pitch and energy of the synthesized speech by FastSpeech and FastSpeech 2. We compute the accuracy by calculating the mean absolute error (MAE) between the frame-wise pitch/energy extracted from the generated waveform and the ground-truth speech. To ensure the numbers of frames in the synthesized and ground-truth speech are the same, we use the ground-truth duration extracted by MFA in both FastSpeech and FastSpeech 2. It can be seen that compared with FastSpeech, FastSpeech 2 and 2s can both synthesize speech audio with more similar pitch and energy to the ground-truth audio.