On Fri, 29 Apr 2011, Jon Elson wrote:
> Date: Fri, 29 Apr 2011 11:24:50 -0500
> From: Jon Elson <el...@pico-systems.com>
> Reply-To: EMC developers <emc-developers@lists.sourceforge.net>
> To: EMC developers <emc-developers@lists.sourceforge.net>
> Subject: Re: [Emc-developers] Fanuc converter
>
> Peter C. Wallace wrote:
>> Certainly at high speed the interpolation is not of much use, but the
>> interpolator will of course also go bad at 0 speed.
>>
> No, the analog values from the encoder disc should be perfectly accurate
> at 0 speed. It is just analog sin/cos interpolation of the optical
> output from the disc.
>> We've considered using such and interpolator with our embedded motion
>> controller to avoid the (expensive if embedded) divide used for velocity
>> estimation. The interpolator is just a second order DPLL, fairly easy to
>> build
>> into the encoder logic, and has the advantage that the velocity falls out
>> directly from the first accumulator.
>>
> If you are trying to interpolate an already-digital signal, then what
> you say is true. But, analog interpolation works at zero speed, and can
> improve positional resolution as well as velocity.
>
> Jon
Yes, I was thinking digital, The sine/cosine ones typically go bad at higher
speeds.
Peter Wallace
Mesa Electronics
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