Geroge, I posted the working code a few messages ago. Try to check this out. BTW as far as I can see those two arguments are optional (window type and beta). Try to run your code without them and check if it works.
wt., 22 lut 2022 o 19:25 George Edwards <gedwards....@gmail.com> napisał(a): > Hello Vasil and Marcin, > > Thanks very much for your help. > > I have all the relevant #include header files and invoke the low_pass > filter as follows: > lpfilter = gr::filter::firdes::low_pass(gain, sampling_freq, cutoff_freq, > transition_bandwidth, > fft::window::win_type::WIN_HAMMING, beta); > > Observations: > Using the mouse to hover over WIN_HAMMING, I can see that it interprets > the win_type enum variable and correctly assigns it a value of "0" (which > is the value stated in the Gnuradio C++ API Reference manual). However, > there is a squidly under beta. Hovering over beta, the error message is: > Argument of type "double" is incompatible with parameter of type > "gr::fft::window::win_type" > > If one of you has a working code fragment using one of the C++ Gnuradio > filter methods that you can cut, paste and send in your next email I would > appreciate it. > > Thanks for your help. > > George > > On Tue, Feb 22, 2022 at 6:15 AM Vasil Velichkov <vvvelich...@gmail.com> > wrote: > >> Hi George, >> >> On 21/02/2022 18.31, George Edwards wrote: >> > lpfilter = gr::filter::firdes::low_pass(gain, sampling_freq, >> cutoff_freq, transition_bandwidth, >> > fft::window::win_type < >> https://www.gnuradio.org/doc/doxygen/classgr_1_1fft_1_1window.html#a599d7e9625d6cc77203a8b877c4911e2>window >> = fft::window::win_type::WIN_HAMMING, beta = 6.76); >> > >> > This failed and showed a squidly across the line with >> fft::window::win_type....! >> >> Try adding "gr::" before "fft::window" and make sure >> gnuradio/fft/window.h is included. >> >> #include <gnuradio/fft/window.h> >> >> lpfilter = gr::filter::firdes::low_pass(gain, sampling_freq, >> cutoff_freq, transition_bandwidth, >> gr::fft::window::win_type window = >> fft::window::win_type::WIN_HAMMING, beta = 6.76); >> >> If this does not fix it then provide the exact error you are getting. >> >> Regards, >> Vasil >> >
