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What is the physical meaning of DFT ?

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marsh

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DFT

Hi all:

can any one explain , "what is the physical meaning of DFT and relation with continuous fourier transform".

thx alot.
 

DFT

DFT is sampled from continuous FT, as if discrete time signal sampled from continous time signal.
 

Re: DFT

Reading "Understanding DSP" of G.Lyon .Actually,DFT is sampled function of FT in both time and frequency domain.Because of that reason,DFT can be calculated by processor or computer
 

Re: DFT

DTFT is used to transform a discrete function from time domain to frequency domain.
But the spectrum you get by applying Discrete Fourier Transform DTFT is continuous.The DFT will produce a sampled (discrete) version of the DTFT specturum (i.e something you can implement using a digital system with small amount of memory). :)
 

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