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transformation length problem of FFT in VHDL

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habbas33

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Hi. I am using xilinx FFT IP cores for FFT transformation but the problem is that FFT IP core takes fixed transformations length of 64,128,256,512,...

is it possible to transform length of 50 , 100 , 126 etc. ie other than the available transform length of the iP core
 

std_match

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For FFT, the length must be a power of 2.
For other lengths, you must look at a more general implementation of the DFT. One example is the Chirp-Z transform.
I don't know if such IP-blocks are available.

Another solution could be to do a resampling of the input signal (change the sample rate) and then use a normal FFT block.
 

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