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Table 11 Fisher scores for vowel discrimination using FrFT-MFCC. Orders are set according to pitch and "formants." MP denotes the main peaks of the LPC spectrum, and Pitch + MP refers to the technique presented in Section 4.2. when , the transforms are multiplied as explained in Section 4.3 (right panel in Figure 5(b)).

From: Pitch- and Formant-Based Order Adaptation of the Fractional Fourier Transform and Its Application to Speech Recognition

  1 2 3 4 All
Pitch + MP 8.45 13.97 17.07 12.66 12.51
Pitch + 2MP 9.78 14.63 18.00 12.03 13.31
Pitch + 3MP 9.32 13.77 13.56 10.18 11.70
Pitch + 5MP 7.58 11.39 9.27 8.00 9.03