摘要
在信号滤波中,相位变化不一致会导致各个频率的波形到达的时间不一致,造成相位失真,使得信号表征的波形受到破坏。相位问题是数字滤波器设计中需要考虑的问题,为了能在相位问题上有更深的理解,通过举例展现相位对波形的影响,进而介绍具有线性相位的有限冲击响应滤波器,分析其在滤波效果上的差异,再介绍和分析存在非线性相位的无限冲击响应滤波器及其滤波的效果。
In the signal filter,inconsistent phase change will lead to inconsistent arrival time of waveforms at different frequencies and result in phase distortion,which will destroy the waveforms of signal characterization.Phase problems will be involved in the design of digital filters.In order to have a better understanding of phase problems,this paper illustrates the influence of phase on waveform by giving examples,introduces finite impulse response filters with linear phase,analyzes the differences in filtering effects,and analyzes infinite impulse response filters with nonlinear phase and their filtering effects.
作者
陈国泰
张赛男
付爽
Chen Guotai;Zhang Sainan;Fu Shuang(Key Laboratory of Nondestructive Testing of Fujian Universities,Fuqing Branch of Fujian Normal University,Fuqing 350300,China;School of Electronic and Information Engineering,Fuqing Branch of Fujian Normal University,Fuqing 350300,China;Institute of Ocean Research,Fuqing Branch of Fujian Normal University,Fuqing 350300,China)
出处
《黑河学院学报》
2020年第5期180-183,共4页
Journal of Heihe University
基金
福建师范大学福清分校校级教改项目“面向应用技术型大学的《数字信号处理》实践教学改革”(XJ14010)
福建省中青年教师教育科研项目“短长度LDPC码的BP列表译码研究”(JAT190489)
福建省海洋经济发展补助资金项目“渔业资源监测机器人系统开发及在海洋牧场管理中的应用”(FJHJF-L-2019-7)
中央引导地方科技发展专项“福建省海岸带生态修复技术创新平台”(2019L3013)。
