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Table 9 Fisher scores for vowel discrimination using MFCC separately for every tone (1, 2, 3, 4) and the score across all tones (The Fisher score across all tones is not equal to the average score over the four tones. Generally this score is smaller than the average value).

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

  1 2 3 4 All
MFCC 8.31 13.88 16.50 12.30 12.20