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Altera_Forum's avatar
Altera_Forum
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13 years ago

How to implement IFFT by megafunction?

Hi,

In my project, I have to implement the FFT and IFFT operators.

I have seen megafunction FFT integrated in Quartus II, but I don't know where's the IFFT core.

Please show me where's IFFT core.

Is the IFFT and the FFT core are the same?

Thanks,

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    i dont know if you still look at this, but theres a guy called "wronghorizon", he or she has solved any fft function, try find him or her

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    thanks Sam_novie,

    I'm trying to contact with him,

    Any other suggestion?
  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    The IFFT can be implemented with an FFT. IIRC you need to do a conjugate operation on both the input and the output, and you may need to do a scaling (divide by N I think).

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

    I found it.

    Simply, there is a control signal named "inverse". When I set it to zero, the block is FFT, when I set it on one, it's IFFT.

    Thanks, all.