Journal of Pure and Applied MicrobiologyVol. 7 No. Special Edition

Bioradar Non-air Conducted Speech Enhancement based on Adaptive Wavelet Packet Entropy

Sheng Li, Huijun Xue, Guohua Lu, Ying Tian, Teng Ma, Yang Zhang, Teng Jiao, Jianqi Wang* and Xijing Jing

School of Biomedical Engineering, Fourth Military Medical University, Xi’an, Shaanxi - 710 032, China.

Received on 03 March 2013 and accepted on 14 April 2013



A novel bioradar is developed in our lab to obtain speech signal from human beings. Due to the special attribute of the millimeter wave bioradar, this speech detecting method may provide some exciting possibilities of wide applications. However, the resulting speech is of less intelligible and poor audibility since the present of the combined and colored additive noise. This paper, therefore, investigates the problem of the bioradar speech enhancement by corporates the wavelet packet entropy based voice/unvoiced radar speech adaptive detection method in a wavelet packet adaptation speech enhancement process. The results from both acoustic and listening evaluations suggest that the background noise can be reduced efficiently while the distortion of bioradar speech remains acceptable, suggesting that the proposed algorithm achieved a better performance of noise reduction over other traditional speech enhancement algorithms.

Keywords : Bioradar, speech, wavelet packet, entropy.