摘要
针对语音通信经常受到背景噪声干扰的问题,本文采用扩展谱减法(ExtendedSpectral Subtraction)在TI公司的TMS320VC5410DSP芯片上实现语音增强系统。实验结果表明,当p取0.85时,获得最佳增强效果,增强后的语音可懂度明显得到改善。由于背景噪声是非平稳的,在低信噪比下语音信号有所损伤,但是没有出现大量的“音乐噪声”,其可懂度也没有显著下降。扩展谱减法可以有效地消除背景噪声,抑制“音乐噪声”,信噪比越高,增强效果越好。即使当信噪比较低(0 dB)时也能很好的提高语音质量。
In speech communication environments often occurs the situation that the speech signal is superosed by background noise. To overcome it we implement a speech enhancement system with Extended Spectral Subtraction （ESS） algorithm on TMS320VC5410 DSP. The results of experiments show that this method can suppress the noisy speech very well even at 0dB SNR with a low level of musical noise. The system gets the best performance when p is 0.85. Because the backround noise is nonstationary, the enhanced speech gets worse when SNR gets lower.
出处
《青岛大学学报（工程技术版）》
CAS
2005年第4期61-64,共4页
Journal of Qingdao University(Engineering & Technology Edition)
关键词
语音增强
谱减
扩展谱减
DSP
speech enhancement
spectral subtraction
ESS
DSP
