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Isnan's avatar
Isnan
Icon for New Contributor rankNew Contributor
4 years ago

FFT IP not working

Dear All, I did some projects using FFT IP to process 20Khz signal from two-channel 5MSPS simultaneously ADC. however, the FFT IP from my design is not working properly. The source_imag of FFT Ip i...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

Hi,


Thanks for your update. Since the hardware observation is matching the FFT, it means that the behavior of the FFT is something expected. I would suggest for you to look into your input data source to check if it only consist of real data or it is consisting of both real and imaginary.


Please let me know if there is any concern. Thank you.


  • Isnan's avatar
    Isnan
    Icon for New Contributor rankNew Contributor
    4 years ago

    I am sorry I don't understand about matching the FFT, what should I do with input signal? do I need pre processing before FFT?. my input data for sink_real is directly from ADC sampling, whereas for sink_imaginer is zero. basically I expect output that contains spike represent frequency and magnitude. however, the FFT output is still in sinusoid type.
    Anyway,, I will try again with several input variations.
    Thank you very much.