舰船噪声环境下改进语音信号增强算法  

Study of speech enhancement in the background of ship-radiated noise

作　　者：李大卫[1] 杨日杰[1] 韩建辉[1] LI Dawei YANG Rijie HAN Jianhui(Dept. of Electronic and Information Engineering, Naval Aeronautical and Astronautical Univ., Yantai 264001, China)

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001

出　　处：《西安电子科技大学学报》2016年第5期133-138,共6页Journal of Xidian University

基　　金：国家自然科学基金资助项目(61271444);"泰山学者"建设工程专项经费资助项目(2011)

摘　　要：谱减法广泛应用于语音增强,但在舰船噪声环境下,噪声的复杂多样性给谱减法中信号的语音段与噪声段的正确检测带来极大的困难,影响了谱减法的效果,为此,笔者在分析信号频谱特性的基础上,首先通过分帧信号相邻帧间频谱的相似性测度对信号段粗判断,再利用帧间偏移方法进行精确判断,实现语音段与背景噪声段的精确辨别,进而利用谱减法实现舰船噪声环境下语音信号的增强.经过大量实测数据的验证,改进的谱减法能够适应多种类型舰船噪声环境下的语音增强,对语音段的判别准确度达到96%,对背景噪声的判别准确度达98%.与传统谱减法及其他相关改进算法相比,在低信噪比强背景噪声下,文中改进谱减法仍能取得稳定的语音增强效果.Spectral subtraction is wildly used in speech enhancement. But it is not always available in the ship working environment because of the fact that it is hard to discriminate the speech duration with the ship noise. So, in this paper, we propose a new approach, which first computes the frequency spectrum similarity and then discriminates the signal segments into speech or noise roughly. And then by the frame shifting method, we achieve a high discrimination precision. Finally, the improved algorithm is benehmarked on a large measured data and experimental results show that the proposed method can be used in various ship-radiated noise environments. The discrimination accuracy is 98% for ship-radiated noise and 96% for speech.

关 键 词：语音增强 谱减法 频谱相似性 语音段检测 帧间偏移 

分 类 号：TN912.35[电子电信—通信与信息系统]