On Thu, Aug 06, 2009 at 12:39:15PM -0700, Milo Wong wrote: > Hi, > > I was browsing the GNU radio C++ API. Here I have a couple of questions > about the class reference of gr_sig_source_f. (Signal generator) > > 1) For the type of public member function waveform(), i.e. gr_waveform_t > waveform () const. Where can I refer to the definition of "gr_waveform_t"?
Hi Milo, You can find it in gnuradio-core/src/lib/gengen/gr_sig_source_waveform.h (Given that there were only 3 includes in gr_sig_source_f, it didn't take long to find it... grep would have worked too) http://gnuradio.org/doc/doxygen/gr__sig__source__f_8h-source.html http://gnuradio.org/doc/doxygen/gr__sig__source__waveform_8h.html > Is there any description of how waveforms(sine wave) are generated? Use the source Luke! gnuradio-core/src/lib/gengen/gr_sig_source_f.cc > 2) I am going to generate a set of sine waves at different frequencies. If > these sine waves are obtained from the iteration equations of harmonious > oscillators: v(t+dt)=v(t) - omega^2 * x(t)dt ; x(t+dt)=x(t) + v(t)dt, is > that different from the way of sine wave generation in gnu radio. Do I need > to create a new sine wave generation block instead of the defaut one? (x(t) > - displacement, v(t) - velocity) > > Thank you, > Milo No, there's no reason to reimplement the sine generator unless you enjoy that kind of thing. First thing to remember is that the block does what it says: it generates a sine wave of the specified frequency and amplitude. We also have blocks to generate sinusoids with frequency a function of its input stream. See e.g, gr_frequency_modulator_fc or gr_vco_f Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
