An array of active null sensors could have some way to process a 'DC'
offset signal separately from the small signal of interest to get a
workable signal to noise.

On Jul 11, 5:49 am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Been thinking about what you said, or the way you said it, and
> observational errors I have made in the past. The phone has to be able
> to resolve the difference between 'tilt' and acceleration. If you make
> it 2-D by mounting it to a grocery cart, as long as there are no
> wheelies, the phone will not have to resolve that difference - it will
> work. If the sensors were located at the ends of the phone, with pure
> acceleration both vectors swing together: magnitude, direction...
> everything. If there is tilting going on there will be a difference
> during the motion that initiates tilt. That feels like one of those
> interpolation things where you want to operate on the difference
> before you digitize the information from each sensor.
> When you look at the cost to implement an accelerometer array and the
> scale of the mobile phone market and the cost (battery and other) of
> GPS and the ability to calibrate out differences in sensor position
> due to manufacturing tolerances (and thermal expansion?), it should be
> have a place. I just don't know if anyone is doing it.
> The steps are Micro Machine expertise with an eye toward making
> elements that provide good linearity over the entire range of interest
> (cascaded sensors?) and difference signal ports so that they can array
> well to resolve the difference between rigid body tilt and
> acceleration. This looks like 3+ years to me, unless someone has all
> the pieces or recognized the market long ago and is already working on
> it.
> On Jul 11, 3:19 am, whitemice <[EMAIL PROTECTED]> wrote:
> > Sounds great, I cant wait to see it in action.
> > Clearly GPS and Cell ID aren't enough for many *ideal* applications,
> > and it will be fascinating to see what's possible when APIs to mix
> > these all together become available.- Hide quoted text -
> - Show quoted text -
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