The Influence of Speech Enhancement Algorithm in Speech Compression with Voice Excited Linear Predictive Coding

D. Deepa ； C. Poongodi ； Dr. A. Shanmugam

《Information Engineering》 2卷4期 (2013/12) Pp. 68-72

並列摘要

Problem statement: Speech Enhancement plays an important role in any of the speech processing systems like speech recognition, speech coding, mobile communication, hearing aid, etc., Approach: In this work, the performance of the speech coding method is enhanced by using speech enhancement as the preprocessing technique. The purpose of the proposed method is to reduce the bit rate of the speech signal to be transmitted, so that the bandwidth can be utilized efficiently. In noisy environment speech coding is done both for desired speech and the unwanted noise signal. If the noise is reduced before coding the speech signal, the bit rate required will also be reduced. In this work a simple adaptive speech enhancement technique, using an adaptive sigmoid type function to determine the weighting factor of the TSDD algorithm is employed based on a subband approach for speech enhancement and Voice excited Linear predictive coding (VELP) method is used for coding the speech signal. Results: Objective and subjective measures like SNR and MSE were obtained, which shows the ability of the proposed method for efficient coding of the speech signal with noise removal. Conclusion/Recommendations: Performance assessment shows that our proposal can achieve a more significant noise reduction and a better coding of the speech signal as compared to the conventional methods.

並列關鍵字

Subband Two Step Decision Directed Approach ； Posteriori SNR ； Mean Square Error (MSE) ； Adaptive Weighting Factor ； Global Masking Threshold ； Signal-To Noise Ratio (SNR) ； Voice Excited Linear Predictive Coding Technique ； Bit Rate