On 18 Aug 2000, at 18:28, Jim Ruxton wrote:

> The recorded motion will also play back
> simulaneously. My biggest challenge as I see it is synchronizing the
> video and motion system. I was thinking of using the audio tracks on the
> video to hold the data. I'm not sure how much data I can pack onto the
> audio track. Does anyone know if this is feasible. Any suggestions or
> thoughts would be appreciated. Thanks!
> Jim
>
It is worth experimenting with the bandwidth of the audio channel on
the VCR (camera... whatever). A sony camcorder we had was
spec..ed  at something like 18kHz BUT we found it was good to over
50kHz!!!

If you really wanted a serious challenge you could use "voice coil"
assemblies (warning "arm and a leg" expensive) as the X and Y
energizers and you could record the (stereo) PWM used by the
control loop to track the subject as absolute values. Fast and smooth.


_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

www.psych.auckland.ac.nz

_____________________________

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