FFT coefficients and frequencies

Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
1 reply · 4K views
smcmon
Messages
1
Reaction score
0

Homework Statement



The following is the output of a 16 point computation of the discrete Fourier Transform for data taken at 10 kHz. Complete the table below by determining the frequencies associated with each of the FFT values.

I attached an Excel workbook with the table.

Homework Equations



This is what I need help with. I need help with how the FFT coefficients relate to normalized and real frequencies.

The Attempt at a Solution



I need help with understanding FFT so I have not gotten this far.
 

Attachments

Physics news on Phys.org
I can tell you how FFT's work and what the numbers mean.
However, I do not know what is expected exactly for a "Frequency normalized" or the "Real frequency".

Do you have definitions from your book for those?

I'd guess that the real frequency is the frequency associated with each row in Excel.
So k = 0 has frequency 0 Hz
k=1 has freq 10 kHz
k=2 has freq 20 kHz
and so forth.