一种基于几何谱减法和听觉掩蔽效应的语音增强方法  

Speech Enhancement Based on Spectral Subtraction of Geometric Approach and Auditory Masking Effect

作　　者：万义龙[1] 张天骐[1] 王志朝[1] 金静[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《微电子学与计算机》2014年第2期80-84,共5页Microelectronics & Computer

基　　金：国家自然科学基金项目(61071196;61102131);教育部新世纪优秀人才支持计划项目(NCET-10-0927);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市杰出青年基金项目(CSTC2011jjjq40002);重庆市自然科学基金项目(CSTC2010BB2398;CSTC2010BB2409;CSTC2010BB2411;CSTC2012JJA40008);重庆市教育委员会科研项目(KJ120525)

摘　　要：针对低信噪比下非平稳噪声环境情况,几何谱减算法产生较大的语音畸变的缺点,提出了一种结合听觉掩蔽效应的改进算法,该算法通过对噪声的实时估计,同时结合听觉掩蔽效应设计一个感知滤波器,对增强后的信号频谱进行滤波以抑制背景噪声,从而将残留噪声强度控制在掩蔽阈值之下.通过计算PESQ、oSNR、语谱图及时域仿真波形图分析及主观试听表明:改进的几何谱减算法不仅提高了语音信号的信噪比,而且残留噪声和语音畸变较小,提高了语音的可懂度.Aiming at non-stationary noise under low signal-to-noise ratio environment situation, the geometric approach to spectral subtraction algorithm produces a larger voice distortion shortcomings, An improved algorithm is proposed based on auditory masking effect, thus to control the residual noise strength under the masking threshold. By calculating the PESQ. oSNR. Spectrogram and time domain simulation waveform diagram analysis and subjective listening test show that improved geometric spectral subtraction algorithm not only improves the signal-to-noise ratio of speech signals, but also reduces the residual noise and speech distortion, to improve the speech intelligibility.

关 键 词：语音增强 几何谱减法 听觉掩蔽效应 感知滤波器 

分 类 号：TN912.35[电子电信—通信与信息系统]