Andy: He has a homemade encoder with less than perfect 50/50 duty cycle and less than perfect 90deg phase shift. So he gets velocity jitter. He's trying to make a 4 sample moving average, since the jitter should cancel out over a full quadrature cycle.
In theory that will be faster responding than a lowpass filter. Since the velocity feedback is used in a spindle speed loop, adding delay (the lowpass) makes tuning harder. Gene: If you XOR the two quadrature signals together you'll get one edge (rising or falling) on every transition. The HAL oneshot component can be configured to produce a pulse on both rising and falling edges. On Sun, Aug 2, 2015, at 05:42 PM, andy pugh wrote: > On 2 August 2015 at 16:32, Gene Heskett <[email protected]> wrote: > > I need a net signal to strobe the 4 sample_hold .hold's, how can that be > > obtained? > > I think we would need more information about what it is you are trying > to do, and how you are trying to do it. > What are you trying to do that normal denounce and lowpass won't do? > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich [email protected] ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
