ok got it
On Mon, May 26, 2014 at 11:40 AM, Marcus Müller <marcus.muel...@ettus.com>wrote: > 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.. > >> > >> > >> > >
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