Chapter 4The Continuous-Time Fourier transform ?From periodic signal to aperiodic signal sas4-11As the period increase:Time function : periodic → aperiodicFrequency spectrum :discrete →continuous sas
Basic function step signal and impulse signalDefinition for DT signal Unit step Unit impulse sas1-41Relations between step and impulsesas1-42Properties of impulse functionsas1-43Sampling properties of
Systems characterized by linear constant-coefficient differential equationssas4-41 Frequency-domain form sas4-42 System frequency responseLet ThenSystem functionsas4-43 Some concept for system functi
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第四章混合类型信号中傅里叶描述的应用41 引言42-44 建立4种信号FT表示,为各类信号的综合及运算提供前提42 周期信号的傅里叶变换43 周期与非周期信号的卷积和相乘44 离散时间信号的傅里叶描述45-46 信号分析的基本原理:抽样及重构45 抽样46 由样本重构连续时间信号47-410 实际应用47 连续时间信号的离散时间处理48 有限持续时间非周期信号的傅里叶级数表示49用离散时间傅里叶级
例4-6-1(1)在零起始状态下,对原方程两端取拉氏变换(2)
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