Andy Pugh wrote: > This sounds like a problem related to the one I am having with my > resolver converter, and one possible solution would be a tracking > filter ( There was a chip made by ST, the L290, a quadrature to voltage converter. It decoded the quadrature into + and - moves, and then had two freq-voltage converters, one for each direction. It then took the difference of the two outputs. Dithering would cause that chip to output a near-zero result.
I think I could come up with a similar scheme for the velocity estimate. The current scheme uses a velocity that is derived from time between pulses, and is therefore signless. But, I think I can use the position delta to assign a count-by-count sign to the velocity from the timestamps. I'll have to work this out on paper first. Jon ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
