基于听觉掩蔽效应和Bark子波变换的语音增强  

Speech enhancement based on masking properties of human auditory system and bark wavelet transform

作　　者：陶智[1] 赵鹤鸣[2] 龚呈卉[1] 

机构地区：[1]苏州大学物理学院,江苏苏州215006 [2]苏州大学电子信息学院,江苏苏州215006

出　　处：《声学学报》2005年第4期367-372,共6页Acta Acustica

基　　金：国家自然科学基金(60172016)苏州大学青年基金(Q3108404)资助项目

摘　　要：提出了一种适用于低信噪比下的提高语音的听觉效果的语音增强方法。该方法在谱减法的基础上有两个特点:首先减参数是根据人耳听觉掩蔽效应提出的且是自适应的;其次采用了与人耳听觉系统特性更为适应的Bark子波变换方法对增强前后的语音进行分析。对该算法进行了客观和主观测试,结果表明:与谱减法相比对低信噪比的语音信号,(1)能更好地抑制残留噪声和背景噪声,(2)增强后的语音具有更好的清晰度和可懂度。A speech enhancement method under very low signal-to-noise ratios is proposed. There are two characteristics in the method based on and compared with the spectral subtraction. First, the subtraction parameter is proposed based on the masking properties of human auditory and is self-adaptive. Second, Bark wavelet transform is used, which is more suitable to human ears' auditory system, to give the before-and-after voice speech sound analysis. By performing an objective and subjective test, it shows that two improvements are made in the very low signal-to-noise ratio speech compared to the spectral subtraction algorithms. (1) reduce the residual noise and background noise more effectively. (2) the enhanced speech is more clearness and intelligibility.

关 键 词：听觉掩蔽效应 Bark子波变换 语音增强 宽带噪声 谱减法 

分 类 号：TN912.3[电子电信—通信与信息系统]