Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Which DFT formula is correct?

Status
Not open for further replies.
P

powersys

Advanced Member level 1
Advanced Member level 1
Joined
Nov 29, 2005
Messages
439
Helped
3
Reputation
6
Reaction score
2
Trophy points
1,298
Activity points
4,981
Some references give (1), while others give (2). Which DFT formula is correct? That is, should the right-hand side equation be divided by N?

Thanks.

 

Hi
The formula given in reference (2) is mostly used.
Actually this depends how you define DFT and IDFT. Some people even define it by dividing formula given in Reference (2) by √N=sqrt(N).
It is only matter of choice. BUT if you use a DFT formula then see its Inverse DFT formula also. If two formula differ in scaling then their inverse will also differ by a scaling factor.
Hope this post clarifies you about DFT.

Waiting for your reply.
MHanif
 

    P

    powersys

    Points: 2
    Helpful Answer Positive Rating
It doesn't matter as long as the product of the terms in front of the DFT and IDFT are equal to 1/N.

You can define the DFT using 1, 1/N or 1/sqrt(N). In these cases the term in front of the IDFT equation will be 1/N, 1 and 1/sqrt(N), respectively.
 

    P

    powersys

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top