Question about FFT of a real signal

[navi_s]

Hello,
I have a question about FFT of real signal.
If we have real signal, with unknown frequency, let suppouse the signal is in range in 20Hz to 20 KHz, and we must do FFT, but our FFT is limited to 1024 points of example.
What is the trick of DSP in such signal.

Best regrds

 

[eda_boy]

DSP and Real signal

Could you please clarify your questtion a bit more

 

[navi_s]

Re: DSP and Real signal

Yes, soryy..
So the question is:
The FFT is correct for N*period of the input signals. What is the prosedure to get exactly a N*period of input signal, to make FFT.

 

[sanbaba]

Re: DSP and Real signal

i) Do overlap and save if you use convolution also.
ii) Do shifting will also help you. by using sliding concept

bye
sanbaba