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Table 6 Performances of the adult test set "AD" with and without normalization of different acoustic correlates. The 95% confidence interval for the performances is 0.64.

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 13.28
Norm. (Formant Frequencies) 4.22
Norm. (Speaking Rate + Pitch + Formant Frequencies) 4.04
(Using "Back Off" Procedure)