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Table 5 Performances of the children test set "CH1" with and without normalization of different acoustic correlates of speech in various combinations. The 95% confidence interval for the performances is 0.39.

From: Exploring the Effect of Differences in the Acoustic Correlates of Adults' and Children's Speech in the Context of Automatic Speech Recognition

Condition WER (%)
Baseline 11.37
Norm. (Speaking Rate + Pitch) 9.48
Norm. (Speaking Rate + Formant Freq.) 2.37
Norm. (Pitch + Formant Freq.) 3.70
Norm. (Speaking Rate + Pitch + Formant Freq.) 3.55
Norm. (Rate + Formant Freq.) 2.28
(Using "Back Off" Procedure)  
Norm. (Pitch + Formant Freq.) 2.46
(Using "Back Off" Procedure)  
Norm. (Speaking Rate + Pitch + Formant Freq.) 2.25
(Using "Back Off" Procedure)