Fig 7. Confusion matrices of the subjective evaluation of the intelligibility of the speech synthesizer (offline reference synthesis).

Confusion matrices for vowels (left) and consonants (right), for each of the three conditions FixedPitch_27, Pitch_27 and Pitch_14. In the matrices, rows correspond to ground truth while columns correspond to user answer. The last column indicates the amount of errors made on each phone. Cells are colored by their values, while text color is for readability only.