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Altera_Forum's avatar
Altera_Forum
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15 years ago

FFT megacore

I'm confused about the Real and Imag. inputs to the fft megacore.

For a streaming FFT architecture accepting its input from an ADC:

-should I set the Imaginary input to zero and connect the ADC to the real input?

-should I write a program to separate the real and imaginary components of the input?

Thanks for any help!

-Sam

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Hello,

    If your ADC provides you two signals (I and Q component), put the I to the real input and the Q to the imag input of the FFT. If your ADC provides you only one signal, put it on the real input of the FFT and set the imag input to zero (remember that a real signal is in fact a complex signal with the imaginary part equal to zero !).

    Jérôme