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Table 2 Fisher scores for tone discrimination using FrFT-MFCC. Orders are set according to N times of pitch rate.

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

  a i e o u Average
2.63 4.48 6.24 4.90 6.61 4.97
2.58 4.15 6.07 4.78 6.48 4.81
2.55 3.95 5.90 4.68 6.38 4.69
2.49 3.71 5.61 4.52 6.19 4.5