Great find, Jeff! I'm also finding it called "Digital Pulse Interval and Width Modulation" with the same acronym. I think it is clearer with the "and" in there, and that version of the name dates back at least to 1995.
Mike On Thu, Apr 02, 2015 at 04:24:06PM -0400, Jeff Long wrote: > > After way to much searching ... under Anisochronous modulation, there is > something called Digital Pulse Interval Width Modulation (DPIWM). > > http://paradise.caltech.edu/papers/thesis010.pdf > > Seems like as good a name as any. > > - Jeff > > On 04/02/2015 03:28 PM, Michael Ossmann wrote: > > I though NRZI had a constant symbol rate. I would expect 011101001 in > > NRZI to look like: > > > > _-_--___- > > > > Mike > > > > > > On Thu, Apr 02, 2015 at 03:23:57PM -0400, Jeff Long wrote: > >> > >> Hey Mike, > >> > >> I think that NRZI. > >> > >> - Jeff > >> > >> On 04/02/2015 02:36 PM, John Ackermann N8UR wrote: > >>> Why not make the ratio 1:3 and then you could call it Morse PWM. :-) > >>> > >>> On 4/2/2015 2:16 PM, Michael Ossmann wrote: > >>>> A friend recently showed me an OOK modulation that I had never seen > >>>> before, and I'm wondering if anyone knows a name for this scheme. > >>>> > >>>> It is PWM where both the on periods and off periods carry data in their > >>>> durations. > >>>> > >>>> In the example we observed, an on or off period with a duration of two > >>>> units represents a zero. An on or off period with a duration of one > >>>> unit represents a one. Example: > >>>> > >>>> --_-_--_--__- > >>>> > >>>> This sequence of amplitudes represents the binary data 011101001. > >>>> > >>>> Note that this scheme has a variable data rate. (Two packets carrying > >>>> the same number of bits may have different durations.) Overall, > >>>> however, the data rate is higher than in a similar looking scheme in > >>>> which data are encoded only in the on periods. > >>>> > >>>> Does anyone know what to call this? I am tempted to call it Biphase > >>>> PWM. > >>>> > >>>> Thanks, > >>>> > >>>> Mike > >>>> > >>>> _______________________________________________ > >>>> Discuss-gnuradio mailing list > >>>> Discuss-gnuradio@gnu.org > >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >>>> > >>> > >>> _______________________________________________ > >>> Discuss-gnuradio mailing list > >>> Discuss-gnuradio@gnu.org > >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing list > >> Discuss-gnuradio@gnu.org > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
