hello all,

When I use the fft blcok, it seems not right.

I build the test system like this:   Square source -> IFFT -> FFT -> File
Sink,  when the input is 1, the output in the file sink is 1, and when the
intput is 0, the output is random, sometimes 0, sometimes between -1 and 1.

Like this:

input:







0 0 0 0 0 0 0





0 0 0 0 0 0 0





0 0 0 0 0 0 0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0





0




0  0 0 0 0 0 0 0




0 0 0 0 0 0 0 0




0 0 0 0 0 0 0 0




0
output:






0 0 0 0 0 0 0





0 0 0 0 0 0 0





0 0 0 0 0 0 0





0




0





0




0





0




0
0



0




0





0




0





0




0  0




0




0

0


0




0





0




0


0
0 0




0
0
0

0




0
0



0




0

0
0
0




0 0


0 0 0




0 0
0 0 0
0




0





0




0





0




0




0 0




0




How should I do, so that the source data is the same as the sink data?

Thanks.

Heyutu
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