第二讲
Basic Signals
基本信号
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Exponential Signals 指数信号

Sinusoidal Signal 正弦信号

离散型

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

The junction is the Euler’s formula
:

Exponentially damped sinusoidal signal 指数衰减正弦信号

Step function

Unit Impulse 单位冲激信号

An impulse can be found at the t=0.
Discrete Impulse
:

Properties of Unit Impulse
:
1st Filter Characteristics

2nd Sampling Characteristics

当
x(t
0
)
无法直接解出时可用取样公式来求解。
3rd Time Scaling

While
α
=-1
,

结论:
Unit Impulse is an Even Function
4th*
延展特性与取样特性综合运用

Ramp Function 斜坡信号

Relation between the Ramp and Unit Function

Application
:以斜坡信号和阶跃信号表示其他信号




Derivatives of the impulse functions 冲激偶信号

冲激偶信号是冲击信号的导函数(
Derivatives
)

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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