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Doubt about FFT points in Xilinx Core

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Doubt about FFT points

Hi guys,

FFT is not my forte, and I'm considering FFT core created by Xilinx Core generator a black box.

But here is what bugging me...

I'm implementing FSM to compute 1024 point FFT on audio sampled at 8000Hz. So, do I need to send data samples in chunks of 1024? And that for every 1024 read by the FFT core it gives a single output data sample(frequency)?

Thanks
 

Doubt about FFT points

Guys...please reply, anyone?
 

Re: Doubt about FFT points

Hi;
I think you may need to review the sampling theory for some details.
However, what I can tell you in brief is that FFT output must be a spectrum, i.e. values (frequency components) versus frequency. You'll have a single output if you send a single frequency tone such as sin(2*pi*fc), then you'll see a delta function at freq = +fc, -fc.
Concerning the length of the samples, yes you must send 1024 of bits even if you add padding zeros.
Please note that FFT may return compplex values, to avoid such a situation you may use the symmetry property of fourier transform.

Best wishes,
Sameh Yassin
 

Re: Doubt about FFT points

Hi samehyassin99,

i don think that u need to send the samples as chunks of 1024, according to me FFT IP by xilinx will take care of data handling., anyways datasheet of that particular ip may be more explanative..

regards
Kalyansuman
 

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