改进谱减法语音增强算法的研究

Research on Speech Enhancement of Improved Spectral Subtraction Algorithm

语音信号中,噪声的存在极大地影响了语音质量,必须采用语音增强技术在一定程度上抑制背景噪声,最大限度地改善语音通信质量,提高语音的可懂度。语音增强就是从带噪语音的信号中提取尽可能纯净的原始语音信号。谱减法由于其计算简单,实时性好,所以得到了广泛应用。文中介绍了基于谱减法的语音增强算法的基本原理,并针对传统谱减法残余"音乐噪声"过强的缺点,分析了两种典型的改进谱减法的原理。实验结果表明改进算法更好地抑制了音乐噪声,有效提高了语音增强效果,改善了语音质量。

For the speech signal, voice quality is greatly affected by the noise. Speech enhancement techniques must be used to suppress background noise, improving voice quality and voice clear degrees. The speech enhancement is to get the speech as original as possible from the speech signal with noise. The spectral subtraction speech enhancement is utilized broadly because it is simple and easy for the re- al-time processing. In this paper, the basic principle of algorithm of the spectral subtraction is presented. Aiming at reducing annoying musical noise in the standard spectral subtraction algorithm, the principle of two kinds of typical improved spectral subtraction is ana- lyzed. Experimental results show that the proposed algorithm reduces the musical noise effectively and improves the speech quality.