FFT system generator block help

[kpallip]

Hi

I have been trying out FFT blocks for calculating FFT of the speech signal and again reconstructing it using FFT block in IFFT mode. I was not able to reconstruct the signal exactly. 

I have been using 256 point DFT, scaled version. Also the FFT calculated using MATLAB  does not yield the similar real and imaginary values as by XSG FFT block. I am attaching the simulink XSG model along with the test speech file. Plz have a look at it and comment.

Thanks!

Vivek 

[nguyentienduy]

If you have any problem, send me: nguyentienduy1512@gmail.com 

[ammara]

plz help me on how to use  ff v5 bcoz it is showing abnormal behaviour. i have tried other version that is working fine with same parameters but i have restriction to use fft v5 bcoz of cyclic prefix........

is there special treatment for fft v5?