On Mon, May 26, 2014 at 10:20 AM, Activecat <[email protected]> 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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