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 Fri, Oct 18, 2013 at 10:05 PM, Tommy Tracy II < address@hidden> 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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