选频及降采样在数字测量信号中的应用  

The Application of Frequency Selection and Down Sampling in Digital Measurement Signal

作　　者：朱调娟[1] ZHU Tiao-juan(School of Humanities,Huizhou Economics and Polytechnic College,Huizhou Guangdong 516057,China)

机构地区：[1]惠州经济职业技术学院人文基础学院,广东惠州516057

出　　处：《长春工程学院学报（自然科学版）》2020年第4期125-128,共4页Journal of Changchun Institute of Technology：Natural Sciences Edition

摘　　要：通过快速傅里叶变换在频谱空间中去除噪声所覆盖的频段,选频后的信号经逆变换还原为时间信号后,再进行降采样提取波形,可有效改善数字测量信号的一阶和二阶导数。根据处理后信号的一阶及二阶导数可以有效识别测量系统参数,进行数据标记和数据对齐等一系列操作。The first-order and second-order characteristics of digital measurement signal can be effectively improved by using Fast Fourier Transform to remove the frequency band covered by noise in the spectrum space,and then the frequency selected signal is restored to the time signal by inverse transformation,and then the waveform is extracted by down sampling.According to the first-order and second-order characteristics of the processed signal,a series of operations such as identifying the parameters of the measurement system,marking and aligning the data can be carried out effectively.

关 键 词：轮廓曲线 边缘检测 分段拟合 信号恢复 高阶微分特征 

分 类 号：O29[理学—应用数学]