第36卷第6期 北京科技大学学报 Vol.36 No.6 2014年6月 Journal of University of Science and Technology Beijing Jun.2014 基于倒谱裁剪的反射声波抑制方法及其在噪声场重构 中的应用 付 强2》，魏龙2》，杨德斌12》，黎敏2四 1)北京科技大学新型飞行器技术研究中心，北京1000832)北京科技大学机械工程学院，北京100083 ☒通信作者，E-mail:limin@usth.edu.cn 摘要为了抑制狭小封闭空间内宽频噪声场的反射声波，提出一种基于倒谱裁剪的反射声波抑制方法.首先利用环境脉冲 响应的持续时间对信号倒谱反射成分进行划分，然后根据理论对代表反射成分的异常点进行判定，最后对异常点的幅值重新 赋子正常值，从而在不破坏噪声信号直射成分的前提下对反射声波进行抑制.在室内弱反射环境和小实验舱内强反射环境中 进行对比实验验证，实验结果表明新方法可有效抑制反射声波，对于反射声波所带来的声场重构误差，由90%降低至35%，有 效提高了声场的重构精度. 关键词声波反射：回波信号抑制：倒谱：噪声场：重构 分类号TB52·5 Reflected acoustic wave suppression method based on the cepstrum clip and its application in noise field reconstruction FU Qiang,WEl Long2,YANG De-bin',LI Min! 1)Research Center for Aerospace Vehicles Technology,University of Science and Technology Beijing,Beijing 100083,China 2)School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:limin@ustb.edu.cn ABSTRACT In order to suppress the reflected acoustic waves of wide band noise in a narrow and enclosed space,this article intro- duces a reflected acoustic wave suppression method based on the cepstrum clip.In the proposed method,firstly,the reflected part in the cepstrum of noise is divided by the environmental impulse response duration;secondly,abnormal points in the reflected part are determined by the theory:finally,the abnormal points are assigned to normal values again,thereby the reflected components are suppressed without breaking the direct components of noise.To validate the proposed method,experiments were performed in an ordinary room,which is a weak reflection environment,and in an experimental module,which is a strong reflection environment. Experimental results show that the proposed method can effectively suppress the reflected acoustic waves.The error of sound field reconstruction brought by the reflected acoustic waves is decreased from 90%to 35%,indicating that the proposed method improves the accuracy of sound field reconstruction. KEY WORDS acoustic wave reflection:echo suppression:cepstrum:noise field;reconstruction 材料与构件在高强度声载荷激励下受到快速交 中试件表面的噪声载荷场进行测量与分析.声疲芳 变应力的作用，容易产生疲劳破坏，出现声疲劳现 实验环境多为行波管、混响室等封闭或半封闭空间. 象.为了分析材料的失效机理，需要对声疲劳实验 当原始声波碰到壁面后会改变传播方向，变为幅度 收稿日期：2014-02-12 基金项目：国家重大科学仪器设备开发专项资金资助项目(2011YQ14014507):中央高校基本科研业务费专项资金资助项目(FRF-AS-12- 003,FRF-MP-12-002A):北京高等学校青年英才计划资助项目(YET0373) DOI:10.13374/j.issn1001-053x.2014.06.020:http://journals.ustb.edu.cn第 36 卷 第 6 期 2014 年 6 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 6 Jun． 2014 基于倒谱裁剪的反射声波抑制方法及其在噪声场重构 中的应用 付 强1，2) ，魏 龙1，2) ，杨德斌1，2) ，黎 敏1，2)  1) 北京科技大学新型飞行器技术研究中心，北京 100083 2) 北京科技大学机械工程学院，北京 100083  通信作者，E-mail: limin@ ustb． edu． cn 摘 要 为了抑制狭小封闭空间内宽频噪声场的反射声波，提出一种基于倒谱裁剪的反射声波抑制方法． 首先利用环境脉冲 响应的持续时间对信号倒谱反射成分进行划分，然后根据理论对代表反射成分的异常点进行判定，最后对异常点的幅值重新 赋予正常值，从而在不破坏噪声信号直射成分的前提下对反射声波进行抑制． 在室内弱反射环境和小实验舱内强反射环境中 进行对比实验验证，实验结果表明新方法可有效抑制反射声波，对于反射声波所带来的声场重构误差，由 90% 降低至 35% ，有 效提高了声场的重构精度． 关键词 声波反射; 回波信号抑制; 倒谱; 噪声场; 重构 分类号 TB52 + 5 Ｒeflected acoustic wave suppression method based on the cepstrum clip and its application in noise field reconstruction FU Qiang1，2) ，WEI Long1，2) ，YANG De-bin1，2) ，LI Min1，2)  1) Ｒesearch Center for Aerospace Vehicles Technology，University of Science and Technology Beijing，Beijing 100083，China 2) School of Mechanical Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: limin@ ustb． edu． cn ABSTＲACT In order to suppress the reflected acoustic waves of wide band noise in a narrow and enclosed space，this article intro￾duces a reflected acoustic wave suppression method based on the cepstrum clip． In the proposed method，firstly，the reflected part in the cepstrum of noise is divided by the environmental impulse response duration; secondly，abnormal points in the reflected part are determined by the theory; finally，the abnormal points are assigned to normal values again，thereby the reflected components are suppressed without breaking the direct components of noise． To validate the proposed method，experiments were performed in an ordinary room，which is a weak reflection environment，and in an experimental module，which is a strong reflection environment． Experimental results show that the proposed method can effectively suppress the reflected acoustic waves． The error of sound field reconstruction brought by the reflected acoustic waves is decreased from 90% to 35% ，indicating that the proposed method improves the accuracy of sound field reconstruction． KEY WOＲDS acoustic wave reflection; echo suppression; cepstrum; noise field; reconstruction 收稿日期: 2014--02--12 基金项目: 国家重大科学仪器设备开发专项资金资助项目( 2011YQ14014507) ; 中央高校基本科研业务费专项资金资助项目( FＲF--AS--12-- 003，FＲF--MP--12--002A) ; 北京高等学校青年英才计划资助项目( YETP0373) DOI: 10． 13374 /j． issn1001--053x． 2014． 06． 020; http: / /journals． ustb． edu． cn 材料与构件在高强度声载荷激励下受到快速交 变应力的作用，容易产生疲劳破坏，出现声疲劳现 象． 为了分析材料的失效机理，需要对声疲劳实验 中试件表面的噪声载荷场进行测量与分析． 声疲劳 实验环境多为行波管、混响室等封闭或半封闭空间． 当原始声波碰到壁面后会改变传播方向，变为幅度