[Xueyan L]

same problem with me, while I’m using the ppls remote desktop.
I’ve raised this issue in the IS Helpline and see what the feedback is. 😂

[Xueyan L]

Hi Catherine,
I’m looking at the fourier transform. It seeems that the first input point x[n] starts with n =0 and ends with n =N-1. The first analysis frequency e^(-(j*2pi*n*k/ N)) also starts with k =0 and ends with k = N-1.
Could you help me explain why do they starts with 0? Is it just an indexing issue?

Besides, I believe the lowest analysis frequency is with k =1. When the input signal has a size of 16, sampling rate as 800Hz, the DFT[1] (with analysis rate as 50Hz) and DFT[15] (with analysis rate as 750Hz) are mirrored by DFT[8], where shall we put the DFT[0] (and maybe a potential DFT[16], with analysis rate as 800Hz)?

Thanks a lot.
Xueyan

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