Refinement of Enhanced Speech Using Hybrid-Median Filter and Harmonic Regeneration Approach

作     者：Ching-Ta Lu Jun-Hong Shen Kun-Fu Tseng Chih-Tsung Chen 

作者机构：Department of Information Communication Asia University Department of Biomedical Imaging and Radiological Science China Medical University Department of Multimedia and Game Science Asia-Pacific Institute of Creativity 

出 版 物：《Journal of Electronic Science and Technology》 (电子科技学刊（英文版）)

年 卷 期：2014年第12卷第3期

页      面：293-298页

学科分类：0711[理学-系统科学] 07[理学] 

基　　金：supported by the NCS under Grant No.NSC 102-2221-E-468-004 

主　　题：Harmonic regeneration hybrid-median filter noise reduction post-processing speech enhancement 

摘      要：This study proposes a post-processor to improve the harmonic structure of a vowel in an enhanced speech, enabling the speech quality to be improved. Initially, a speech enhancement algorithm is employed to reduce the background noise for a noisy speech. Hence the enhanced speech is post-processed by a hybrid-median filter to reduce the musical effect of residual noise. Since the harmonic spectra are impacted by background noise and a speech enhancement process, the quality of a vowel is deteriorated. A harmonic regenerated method is developed to improve the quality of post-processed speech. Experimental results show that the proposed method can improve the quality of post-processed speech by adequately regenerating harmonic spectra.