+ Post New Thread
Results 1 to 5 of 5
 2nd July 2007, 13:16 #1
 Join Date
 Feb 2006
 Posts
 102
 Helped
 3 / 3
 Points
 1,994
 Level
 10
advantages of dft
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.
 2nd July 2007, 13:16
 3rd July 2007, 20:25 #2
 Join Date
 Jun 2007
 Posts
 26
 Helped
 4 / 4
 Points
 1,087
 Level
 7
advantages of dft over dtft
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.
 3rd July 2007, 20:25
 6th July 2007, 19:01 #3
 Join Date
 Feb 2006
 Posts
 102
 Helped
 3 / 3
 Points
 1,994
 Level
 10
advantages of dft method
jahmad quoted
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.
Any explanation of the above queries would be helpful.
Thanks
wajahat
 6th July 2007, 19:01
 13th July 2007, 04:58 #4
 Join Date
 Aug 2004
 Posts
 225
 Helped
 47 / 47
 Points
 3,573
 Level
 14
calculating the dtft from the dft
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
 20th July 2007, 17:00 #5
 Join Date
 Mar 2006
 Location
 My Love Iran
 Posts
 231
 Helped
 44 / 44
 Points
 3,542
 Level
 13
advantages fft over dft
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.
+ Post New Thread
Please login
LinkBacks (?)

Untitled document
Refback This thread29th August 2014, 16:55