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Table 6 Number of semitones of pitch shift (PF), or ratio of speed of the new speech to speed of the original speech (SF), used when generating augmented data from the original data, for each virtual speaker

From: Text-to-speech system for low-resource language using cross-lingual transfer learning and data augmentation

# Speaker Pitch or speed factor   # Speaker Pitch or speed factor  
1 −2.5 PF 14 0.85 SF
2 −2.0   15 0.9  
3 −1.5   16 0.95  
4 −1.0   17 1.1  
5 −0.5   18 1.15  
6 0.5   19 1.2  
7 1.0   20 1.25  
8 1.5   21 1.3  
9 2.0   22 1.35  
10 2.5   23 1.4  
11 0.7 SF 24 1.45  
12 0.75   25 1.5  
13 0.8   26 1.55  
  1. PF pitch factor, SF speed factor