Hi George, I also tried to use *low_pass() *function in my C++ program but with no luck. My linker shouts that there is undefined reference to this function but headers where recognized. How did you install the GNU Radio? Was it installation from PPA or building from source? Marcin
pon., 21 lut 2022 o 18:28 George Edwards <gedwards....@gmail.com> napisał(a): > Hi Marcin, > > Thanks again for your help! I was a little busy and finally got around to > looking at the two C++ fir filter documents you sent me. > > I tried to design an OOT C++ FIR lowpass filter block based on my > understanding of these documents but my code shows error (squidly). In the > OOT C++ code, I included all the #include header files shown in the > documents. Then using the first document above for the lowpass design, I > wrote the following: > vector <float> lpfilter; > then, I defined all the filter parameters (give them value) and tried to > use the filter method: > 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....! I also tried leaving off the gr::filter::firdes > > nothing worked and I included the fft window header file! > Please send me code examples if you have any that shows how to use these > functions/methods. > > One more question: on a search on the second document, it says the remez > filter_types > are: one of "bandpass", "hilbert" or "differentiator", I would have > thought lowpass filters would be included?? > > Thank you! > > George > > On Mon, Feb 14, 2022 at 12:05 AM Marcin Puchlik <m.puch...@is-wireless.com> > wrote: > >> Hello George, >> Yes, there is. Check this out: >> https://www.gnuradio.org/doc/doxygen/firdes_8h_source.html >> https://www.gnuradio.org/doc/doxygen/pm__remez_8h.html >> BR, >> Marcin >> >> pon., 14 lut 2022 o 00:07 George Edwards <gedwards....@gmail.com> >> napisał(a): >> >>> Hello GNURadio Community, >>> >>> I am designing a Gnuradio OOT block in C++. Are there firls and kaiser >>> filter methods (analogous to the scipy package methods that one would use >>> in Python OOT) that I can call to generate coefficients. >>> >>> Thank you! >>> >>> Regards, >>> George >>> >>
