The high effective application of FFT and IFFT of real signal for seismic data processing

As well known, the amount of data is enormous in seismic signal processing while the FFT is for complex signal usually. Using complex sequences FFT arithmetic to deal with seismic signal in simple will double the amount of data and increase the amount of calculation. Based on the symmetrical character of real signal, this paper discussed methods of FFT and IFFT to treat with real signal, and the quantitative analysis has been done at the same time. Finally, the field seismic data were calculated with the method. It is clearly that the method can reduce about half amount of calculation and save the computer memory space.