On Wed, Sep 23, 2015 at 4:06 PM, Piotr Krysik <per...@o2.pl> wrote: > Hi all, > > Fractional resampler has additional "rate" signal input for supplying > resampling ratio for each input signal sample. > Changes of the signal on the "ratio" input might result in loss of tags > that are close in time to these changes. > > I observed the problem when I was implementing frequency offset > corrector (attached flowgraph screenshot). > Short description what is going on there: > -when message comes to ppm_in port of the block "Controlled const > source" changes value of constant at the output, > -when Controlled rotator observe this change on its input, it emits > stream tag, > -for changes of about +/-50ppm (and above) on the 'ratio' input of the > Fractional Resampler, tags coming from the Controlled rotator are not > going through. > > Just by looking at the Fractional Resampler implementation > ( > https://github.com/gnuradio/gnuradio/blob/master/gr-filter/lib/fractional_resampler_cc_impl.cc#L104 > ) > I'm not able to locate source of the problem. > > I can implement minimal working example if needed. > > Best Regards, > Piotr Krysik >
Piotr, Looking at the block, I was hoping it was as easy as putting a set_relative_rate call in the set_resamp_rate to adjust how the tags are being propagated. But it's not that simple. See Issue #846 ( http://gnuradio.org/redmine/issues/846) for details on the problem. Tom
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