On Tue, Jun 12, 2012 at 08:19:21PM +1200, John Shields wrote: > When I add a FFT block in the GRC (gr_fft_vxx if I understand things > correctly) I am offered a boolean parameter 'shift'. When I attempt > to discern the code, there is a comment: > > // apply a fft shift on the data - for the fwd FFT and > // apply an ifft shift on the data - for reverse. > > What does this parameter do?
It applies an FFT shift on the data for the forward FFT and an IFFT shift on the data for reverse FFT. Did that help? If not, a quick Google search for 'fft shift' explains that this moves the DC carrier to the centre of the spectrum (instead of the far left). MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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