[time-nuts] GPS->audio interface

[Brooke Clarke]

Hi James:

You might want to get a KIWI-OSD, Video overlay of GPS precision time 
stamp.  It adds HH:MM:SS EEEE OOOO FFFFFF at the bottom of the image and 
so can be seen in every field.  They have also developed a way to 
calibrate the camera shutter in relation to the frame time by using a 
number of LEDs.  The main use if for star occulation timing.
http://www.geocities.com/kiwi_36_nz/kiwi_osd/kiwi_osd.htm

Have Fun,

Brooke Clarke
http://www.prc68.com



Lux, James P wrote:
> I'm looking for a way to take GPS time and generate a signal that can be recorded on the audio track of a video recording to time stamp it. This is so it can be aligned with other data that's collected with GPS based time.  It needs to be portable/small (i.e. Something you could attach to a small camcorder, or such).
>
> Seems that a GPS->IRIG B interface would work, but I was wondering if someone has done this already (e.g. Someone must have made a IRIG encoder in a PIC or similar)..
>
> Another alternate is if something like a iPhone records accurate time with the video stream. (another of the data sources is an iPhone recording something else)
>
> I think the basic requirement is accuracy to some few milliseconds (e.g. Frame rate of the video)..
>
> (It's for a high school science project, where they want to record various things, and line them up.. I think they could deal with looking at the timestamps over many frames to do interpolation)
>
> Anyway, cheap and cheerful consumer gear is what is sought. (so no suggestions of synthesizing SMPTE from the output of my Z3801 and feeding it to a RED camera.. We're talking AIPtek and iPhone here..)
>
> Jim Lux
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