An Improved Combined-Dictionary Method for the Judgment of Voiced and Unvoiced Sounds

To solve the problem of the confusion in atoms between voiced and unvoiced dictionaries, an improved Combined-Dictionary method of the judgment in voiced and unvoiced sounds is proposed. Combining the correlation coefficient method and Mahalanobis distance, a new approach is explored to analyze the similarity of atoms. By analyzing the correlation in corresponding atoms, the appropriate threshold value is selected and the clean combined-dictionaries are obtained. The results have indicted, under the same conditions, the improved combined-dictionary method has higher accuracy and faster computing speed than the original method. ¹