Deriving DTFT of Periodic Sequence from CTFT Formula
There are four basic Fourier transforms.In the process of learning and using,students feel that there is some isolation between continuous and discrete,and it is not easy to integrate the two,but mechanically memorize them.After introducing the impulse function in the frequency domain,the periodic signals/sequences also have Fourier transform,so that the Fourier analysis method can be applied to the problems of modulation and sampling,which reflects the importance of the unification of Fourier transform.With the help of four basic transforms,the unity of Fourier transform between continuous time and discrete time was discussed.Linking continuous time and discrete time Fourier analysis,a unified Fourier transform method is proposed to achieve better teaching effect.
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