### (@edinsam)

Thanks.Put it down to program laziness. fftw requires arrays to be "prepared" so that the FFTs are optimised for the machine being used. In haste, I used only one...

Sorted.The double FFT operation was returning the input array "time reversed" I tried printing the output of a 64 point FFT-IFFT as you suggested, and it showed...

Thanks. This was just an experiment as the original code uses a FIR filter which works quite happily using the same sized blocks. The original uses the standard...

Yes, quite. My maths says that a forward FFT followed by an inverse FFT should produce the same array (apart from crud, and normalisation) as the two matrix multiplications...

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