On Wed, Mar 29, 2006 at 10:08:50PM -0600, Rick Parrish wrote: > John Ackermann N8UR wrote: > > >the use of AFSK with 1200 and 2200Hz tones is simply an artifact of that. > > Instead of toggling back-and-forth between two independent tone sources, > how hard would it be to create samples for a 1200 hz tone spanning one > symbol period where the initial phase was arbitrary eg. if you used a > sin(theta) function, it wouldn't always start at theta = 0. Same for the > function to generate samples spanning one symbol period for the 2200 hz > tone. > > The idea I'm getting at is you could have your signal transition > smoothly (as possible) between the two tones which would result in a > cleaner, more efficient signal. > > A sample rate that is an integer multiple of the symbol rate is a nice > thing but isn't required. > > -rick
gr.frequency_modulator_fc will give you continuous phase. Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
