Ali, again: there is no center frequency in a baseband simulation. Your sawtooth-repeat combination will give you a step signal, where the amplitude is constant for 500 items. All frequencies that you set are only used to calculate what will happen in one sample.
The frequency mod is but an input amplitude controlled complex sine. It outputs a signal, which has a momentary phase increase that is proportional to sensitivity and input amplitude; see the doxygen documentation for the frequency_modulator block. Greetings, Marcus On 24.05.2014 09:47, jason sam wrote: > Correction not 50 Hz but whatever the rate is after interpolation > > > On Sat, May 24, 2014 at 12:23 PM, jason sam <[email protected]> wrote: > >> Another question related to my flowgraph that when i use the' Frequency >> Mod' block...then it will take the center frequency as 50Hz(the freq of the >> signal coming in)?? >> >> >> On Fri, May 23, 2014 at 1:28 PM, Ron Economos <[email protected]> wrote: >> >>> I was experimenting with this the other day. I used >>> the wide band FM modulator instead, since the >>> deviation can be set. Here's the flow graph. >>> >>> http://www.w6rz.net/fmtest.grc >>> >>> The test audio files. sine01.wav is 0.1 Hz and >>> sine15k.wav is 15000 Hz. >>> >>> http://www.w6rz.net/sine01.wav >>> >>> http://www.w6rz.net/sine15k.wav >>> >>> Some C code to generate audio files at other frequencies. >>> >>> http://www.w6rz.net/sine.c >>> >>> Ron >>> >>> >>> >>> On 5/22/2014 9:26 PM, jason sam wrote: >>> >>>> Hi, >>>> I have made the flowgraph as attached..It is showing the modulation in >>>> scope but in fft block it's continuously changing so I am still unable to >>>> find out that what are the max and min frequencies??I know how to find that >>>> in theory but i want to prove it from my results.. >>>> >>>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> [email protected] >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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