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I am very sure I used a same block of input data, and just the input order was changed, then different transform results were gotten, although the difference is not large. By the way, the transform results are more closer to the results calculated in MATLAB when the input data block is transfered to the FFT function as the first input block.
I totally have no idea about this problem, can anyone help me? Thanks!!
Tigre
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same fft input frame must produce same output frame.
check you are missing one or so data or inserting a zero in input or cutting it short or duplicating ...etc at the point you change to second frame. Very common. check directly at input to fft and not somewhere ahead.
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