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Altera_Forum's avatar
Altera_Forum
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11 years ago

FFT_verification

Hi ! When I run FFT and IFFT tool in megawizard, the results are not logical. For example firstly I run the FFT tool with the megawizard tb (input: natural order, output : digit reversed order)...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

I used the output of FFT for the input of IFFT.I mean I modified the tb for IFFT.

By the way I found the solution ;) When you check in binary for floating point it is hard to find what is wrong.

When I converted to decimals in Matlab I saw that the output multiplied with the FFT size.

For example if you use 8-IFFT the outputs are 8 time greater than the outputs had used to be. You should normalize them by IFFT size ;)

Thanks anyway for your reply