舰船通海管路低频消声技术的研究进展

分析水管路低频消声技术的实船应用环境,指出通海管路在声传播、空间布置等方面存在的特点以及安全性、空间布置等方面的要求。在此基础上,将通海管路低频消声技术分为传统抗性消声技术、气囊式消声技术、水动力弹性板式消声技术以及主动消声技术等4个方面,结合实船环境,详细分析各项技术的优缺点,指出下一步应继续开展的工作。     

SPEECH ENHANCEMENT BASED ON SECOND ORDER ARCHITECTURE AND INFORMATION MAXIMIZATION THEORY

ＣＨＩＴＥＣＴＵＲＥ ＡＮＤ ＩＮＦＯＲＭＡＴＩＯＮ ＭＡＸＩＭＩＺＡＴＩＯＮ ＴＨＥＯＲＹTX＠虞晓＠胡光锐＠陈玮ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｂｒｏａｄｕｓｅｏｆｓｐｅｅｃｈｒｅｃｏｇｎｉｔｉｏｎｄｅｍａｎｄｓｅｎ－ｈａｎｃｅｍｅｎｔｏｆｎｏｉｓｙｓｐｅ...     

基于Matlab的自适应滤波器设计

滤波器在电子设备中已得到广泛的应用,而自适应滤波器可以不必事先给定信号及噪声的自相关函数,它可以利用前一时刻已获得的滤波器参数自动地调节现时刻的滤波器参数,从而实现最优滤波。介绍了自适应滤波器原理,并对LMS自适应算法进行了分析,最后用Matlab对自适应低通滤波器进行了仿真和实现,并分析了该自适应滤波器的性能。     

Fast affine projection algorithm for adaptive noise canceling and its application on the fetal electrocardiogram extraction

Aimed at the problem of adaptive noise canceling (ANC), three implementary algorithms, which are least mean square (LMS) algorithm, recursive least square (RLS) algorithm and fast affine projection (FAP) algorithm, have been researched. The simulations were made for the performance of these algorithms. The extraction of fetal electrocardiogram (FECG) is applied to compare the application effect of the above algorithms. The proposed FAP algorithm has obvious advantages in computational complexity, convergence speed and steadystate error.