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Difference between Fourier transform and the z-transform

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desaipa

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please tell me the diffrance between fourier transform and the z-transform
in which case i have to use fourier or z transform.

PD
 

Re: help z- transform

I think it is more meaningful to compare z-transform with Laplace transform. Laplace transform is used for differential equations and analog signals. The z-transform is used for difference equations and digital signals. If you restrict your z-transform to the unit circle of z-plane, you get Fourier transform.
 

Re: help z- transform

Z transform are meant only for digital signals. So if you need to convert a digital signal to frequency domain then you use z tranform. Fourier transform can be used for continous signal as well as digital signal. For digital signal you would use DFT or DTFT depending upon requirement
 

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