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前面理解ejΠte^jΠtejΠt的含义，中间的那些动图就欣赏好了，最后在理解傅里叶变换。link

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参见：Infinite Series and proofs for them

Discrete sinusoidal signal 的数学表达式可以为：x(n)=Asin(ωn+φ）x(n)=Asin(ωn+φ）x(n)=Asin(ωn+φ）这里A,ω，φ都是原来的意义.Time period of the discrete sinusoidal signal is given by:N=2πm/ωN=2πm/ωN=2πm/ω下面是推导过程：...

Sinusoidal SignalAll continuous-time signals are periodic. The discrete-time sinusoidal sequences may or may not be periodic. They depend on the value of ω. For a discrete time signal to be periodic, the angular frequency ω must be a rational multiple of

Time Domain DescriptionOne of the more useful functions in the study of linear systems is the “unit impulse function.” An ideal impulse function is a function that is zero everywhere but at the origin, where it is infinitely high. However, the area of