On Sat, Feb 26, 2011 at 8:00 AM, Antoine Dedave < qlmqny_anti_r...@hotmail.com> wrote:
> Hi, > > I'm implementing a 2-FSK modulator (I Know that a good one already exists > but > i have to do it myself for academic purpose). > > To do so, i produce a given (N) number of samples corresponding to the > sampling of a complex exponnetial for each > incoming bits. > > The "sampling rate" (one bit => N samples) is increased by N through the > modulator, so i'm doing this > > Constructor: > > set_relative_rate(N); > set_output_multiple(N); > > General_work: > > consume_each(noutput_items/N); > > Is that correct? and is there anything else to do? > > Thanks in advance, > > Antoine Dedave > First, what type of gr_block are you inheriting from? The fact that you are using noutput_items/N in your consume_each function makes it look almost like you are using a gr_sync_block, which would not be the right answer here. In fact, you can use a gr_sync_interpolator since you know the direct relationship between input and output samples (1-to-N). Set the interpolation rate as N and you don't need to worry about any of the reset (setting the relative_rate or consume_each; the parent class knows what to do with them). Look at the implementation of gr_sync_interpolator to see how it handles setting everything up for you to do the interpolation properly. Tom
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