Hi Ali, I'm talking about http://gnuradio.org/doc/doxygen/classgr_1_1analog_1_1frequency__modulator__fc.html
This is the and thus only comprehensive documentation. But really, all this block does is, like I in text [1] and activecat in text and code[2] tried to explain, is increase the phase of its output signal by sensitivity*input . I get the feeling this has been discussed exceedingly enough, and would like to close this thread. Greetings, Marcus [1] It outputs a signal, which has a momentary phase increase that is proportional to sensitivity and input amplitude [2] d_phase = d_phase + d_sensitivity * in[i]; On 26.05.2014 06:25, jason sam wrote: > Hi Marcus, > I have seen the doxygen documentation but it's all code there,no > description.Can u kindly guide me where to find good documentations for the > GRC blocks?? > Regards, > Ali > > > On Mon, May 26, 2014 at 7:31 AM, Activecat <active...@gmail.com> wrote: > >> On Mon, May 26, 2014 at 10:20 AM, Activecat <active...@gmail.com> wrote: >> >>> On 25.05.2014 20:01, jason sam wrote: >>> >>>>> But if it is doing FM then there should be some min and max >>>>> frequencies between which the signal will be switching? >>> >>> If you refer to the source code of the frequency_modulator_fc_impl.cc, >>> then the min and max frequencies could be calculated. >>> >>> Says, your sampling rate is samp_rate >>> >>> Assuming the lowest input value to the FM block is zero, then >>> minimum frequency of the FM output = samp_rate * sensitivity / ( 2 * PI >>> ) >>> >>> Assuming the highest input value to the FM block is Vmax, then >>> maximum frequency of the FM output = samp_rate * ( sensitivity + Vmax ) >>> / ( 2 * PI) >>> >> To avoid disagreement, the sampling rate (samp_rate) refers to the number >> of elements produced by this FM block per second. >> If there is no speed-limiting element (throttle, usrp, sound card etc) in >> the flowgraph, then someone may say that samp_rate becomes meaningless, if >> this is the case then in fact frequency also becomes quite meaningless.. >> >> >> _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
