Discrete Fourier Transform (DFT) is basically the frequency sampling of Discrete Time Fourier Transform (DTFT). It was observed that the resolution of the frequency spectrum improves when zero padding is done.It basically gives the expanded view of the spectrum over the same range which also reduces the approximation error.The spectrum gets compressed , also becomes periodic when input signal is expanded in time domain.Expansion was implemented by adding zeroes in between. DFT is computationally slow.
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ReplyDeletePrecise and well written.
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ReplyDeletewell explained
ReplyDeleteGood explaination
ReplyDeleteDFT enables us to perform frequency domain analysis of Discrete time signal
ReplyDeleteYes that's right
DeleteResolution increases because frequency spacing reduces since length increases.
ReplyDeleteSpacing between the values reduces as the value of N increases. By appending the input sequence by zeros the resolution error reduces.
DeleteDFT can be used for real time signal processing applications
ReplyDeleteYes definitely
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