hello, you can use the FIR filter of the mapping lib sending a [1 -0.5 -0.25 -0.25< message on the right inlet to set the coeficient should be ok.
cyrille Oded Ben-Tal a écrit : > DPCM is Differential pulse code modulation, and its possible to get an > estimate of derivative with the right predictor. While the difference > between the last two messages is an approximation of the derivative its is > a really bad one so extrapulating on 4-points is much better. (dsp theory > is really not my area but I'm sure some people will be able to explain > much better about dpcm) > What I'm looking for is a way to: > (1) store the last 3 values in the series. > (2) an estimate of the derivative should be > x0 - 1/2 * x1 - 1/4 * x2 -1/4 * x3 (where x0 is the most recent element) > (3) switch places so the x0->x1 x1->x2 x2->x3 ready to do it again. > > I'll try looking at list-abs (I think I tried poking around those on my > office mac but pd-extended couldn't find them so I left it at that). > > thanks > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
