第二讲 Basic Signals基本信号

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第二讲 Basic Signals基本信号
#该课程为陈后金教授的信号与系统课程,该课程可在国家精品课程网上下载 #
#This was a note noted by WONG Zinhoo,  Reproduced please specify the Source and the original link.该笔记由 WONG Zinhoo记录,转载请注明#

Exponential Signals 指数信号

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Sinusoidal Signal 正弦信号

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离散型
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Relation between Sinusoidal and Complex Exponential Signals 
     正弦信号与复指数信号的关系

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The junction is the Euler’s formulahttp://e.hiphotos.baidu.com/baike/s%3D127/sign=17fae34afe039245a5b5e50db095a4a8/faedab64034f78f023028f747b310a55b3191c2f.jpg

Exponentially damped sinusoidal signal 指数衰减正弦信号

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Step function

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Unit Impulse 单位冲激信号

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An impulse can be found at the t=0.
Discrete Impulse
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Properties of Unit Impulse 
 1st Filter Characteristics
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2nd Sampling Characteristics
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x(t 0) 无法直接解出时可用取样公式来求解。
 3rd Time Scaling
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 While α=-1 graphic
 结论:Unit Impulse is an Even Function
 4th*延展特性与取样特性综合运用
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Ramp Function 斜坡信号

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Relation between the Ramp and Unit Function
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Application:以斜坡信号和阶跃信号表示其他信号
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Derivatives of the impulse functions 冲激偶信号

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冲激偶信号是冲击信号的导函数( Derivatives
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注:偶函数的导数是积函数,奇 函数的导数是偶函数

Singular Signals’ Relationship 各奇异信号之间的关系

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