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wajahat
Joined: 03 Feb 2006
Posts: 102
Helped: 2
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 02 Jul 2007 12:16 advantages of dft |
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Hi all, i want to know if dtft can be calculated using dft what are its advantages.One can calculate the dtft directly.why to use dft.
Any response in this regard would be helpful.
regards
wajahat.
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jahmad
Joined: 20 Jun 2007
Posts: 26
Helped: 4
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03 Jul 2007 19:25 advantages of dft over dtft |
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Hi,
DFT is completely discrete both in frequency and time, however DTFT is only discrete in time but continueous in frequency. DTFT is not used in actual digital signal processing, its DFT which is mostly calculated using fast algorithms called FFT algorithms.
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03 Jul 2007 19:25 Ads |
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wajahat
Joined: 03 Feb 2006
Posts: 102
Helped: 2
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06 Jul 2007 18:01 advantages of dft method |
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jahmad quoted
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DFT is completely discrete both in frequency and time, however DTFT is only discrete in time but continueous in frequency. DTFT is not used in actual digital signal processing, its DFT which is mostly calculated using fast algorithms called FFT algorithms.
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I know that dft is for finite sequences.Now if dft is used in actual digital signal processing ,how dft is calculated for infinite sequences or there are no infinite sequences in actual dsp they are present omly in theory.
Any explanation of the above queries would be helpful.
Thanks
wajahat
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bulx
Joined: 07 Aug 2004
Posts: 171
Helped: 24
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13 Jul 2007 3:58 calculating the dtft from the dft |
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Your second question (comprehensively answered by jahmad ) is completely different from the first question. Hope thats your intention.
Obviously, you cannot deal with infinite sequnces in pratice, you always do the FT on a limited number of samples.
-b
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m_llaa
Joined: 12 Mar 2006
Posts: 277
Helped: 23
Location: My Love Iran
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20 Jul 2007 16:00 advantages fft over dft |
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Hi
Signal processing of infinite (or finite and long duration) signals is done with truncation of signal with some known window. You can search this method by searching window.
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