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5954 Discussions

How to implement IFFT by megafunction?

Altera_Forum
Honored Contributor II
808 Views

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,
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5 Replies
Altera_Forum
Honored Contributor II
94 Views

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
Honored Contributor II
94 Views

thanks Sam_novie,  

I'm trying to contact with him, 

Any other suggestion?
Altera_Forum
Honored Contributor II
94 Views

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
Honored Contributor II
94 Views

Thanks you Daixiwen!

Altera_Forum
Honored Contributor II
94 Views

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.
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