Thanks a lot. I do have a question about the 6.67 that you pass to the gr::firdes::window(gr::filter::firdes::WIN_BLACKMAN_HARRIS, SIZE, 6.67);
What is the importance of this value? Is this the default BETA? I found that when creating a BLACKMANHARRIS window in python and c++, I got two different results. Sincerely, Tommy James Tracy II Ph.D Student High Performance Low Power Lab University of Virginia Phone: 913-775-2241 On Oct 18, 2013, at 5:20 PM, Alexandru Csete <oz9...@gmail.com> wrote: > On Fri, Oct 18, 2013 at 10:05 PM, Tommy Tracy II <tj...@virginia.edu> wrote: >> Hello, >> >> I'm trying to make an FFT block in my hierarchical block, but I cannot seem >> to find the correct syntax. >> I'm trying to make it with a BLACKMAN_HARRIS windowing function, and it's >> easy in a python program: >> >> fft_forward = fft.fft_vfc(window_size, True, >> (fft.blackmanharris(window_size)), 1) >> fft_backward = fft.fft_vcc(window_size, False, >> (fft.blackmanharris(window_size)), False, 1) >> >> >> But in a c++ program it gets hairy. Does anyone have any experience with >> this? >> >> gr::fft::fft_vfc::sptr fft_forward = gr::fft::fft_vfc::make(SIZE, true, >> gr::filter::firdes::WIN_BLACKMAN_HARRIS, num_threads); >> gr::fft::fft:vcc::sptr fft_reverse = gr::fft::fft_vcc::make(SIZE, false, >> gr::filter::firdes::WIN_BLACKMAN_HARRIS, false, num_threads); >> >> I believe what I have wrong is the Windowing, which is of the form: >> >> const std::vector< float > & window > > I have only used gr::fft::fft_complex in C++ but I think it uses the > same window type. If that's true you can create the window using: > > window = gr::filter::firdes::window(gr::filter::firdes::WIN_BLACKMAN_HARRIS, > SIZE, 6.76); > > Alex
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