Hi Ron, Thanks again for sending the links and annotating the lines of interest. I have looked through links and have some questions: Q1. The lib/CMakeList.txt file I can identify easily, but I am not sure which is the top level CMakeList.txt file. There are CMakeList.txt files in directories "apps" and "grc" in my project directory and I am not sure which is considered the top level. I do not know if you can help me here (thing is, in my project the contents of these CMakefileList.txt files are small and do not mimic that in the link you sent, so I have no clue).
Q2. I am reading in a fixed size vector of floats to compute the fft and output a vector of fft values (complex) the same size as the block of input, so I assumed the OOT block should be a "sync" block, right? Q3. Assuming the input vector comes in on the variable "in" and the output vector is on the variable "out" how do I taylor the expression in the link which I copied below to compute the fft and pass it to the output (plus, is volk_32fc_s32fc_multiply_32fc(...) a function in the fft computation module?): [image: df0555eb-9839-457b-ac3d-0a4c9d17c662.png] Thank you very much! George On Wed, Dec 15, 2021 at 12:32 AM Ron Economos <[email protected]> wrote: > FFT support is built in to GNU Radio with FFTW. Here's how it's done. > First, define it in your foo_impl.h file. The options are fft_complex_fwd, > fft_complex_rev, fft_real_fwd and fft_real_rev. > > https://github.com/drmpeg/gr-paint/blob/master/lib/paint_bc_impl.h#L25 > > https://github.com/drmpeg/gr-paint/blob/master/lib/paint_bc_impl.h#L41 > > Then initialize it in your foo_impl.cc constructor. > > https://github.com/drmpeg/gr-paint/blob/master/lib/paint_bc_impl.cc#L47 > > Then execute it. > > > https://github.com/drmpeg/gr-paint/blob/master/lib/paint_bc_impl.cc#L175-L179 > > You'll need to add the component in the top level CMakeLists.txt. > > https://github.com/drmpeg/gr-paint/blob/master/CMakeLists.txt#L78 > > And link with it in lib/CMakeLists.txt > > https://github.com/drmpeg/gr-paint/blob/master/lib/CMakeLists.txt#L25 > > If you need a window, you can look at the block implementation file for > details. > > https://github.com/gnuradio/gnuradio/blob/master/gr-fft/lib/fft_v_fftw.cc > > Ron > On 12/14/21 7:53 PM, George Edwards wrote: > > Dear GNURadio Community: > > I am writing a C++ OOT block where the signal processing requires > the computation of both fft and ifft. Is there any Gnuradio C++ functions > for the fft and ifft? If not, is there any way to wrap in Python's > libraries with these methods into C++ OOT? > > Thank you! > > Regards, > George > >
