[time-nuts] GPS->audio interface

[Neville Michie]

Hi,
  low tech solution may be to produce second pips of audio with long  
one minute pips,
a bit like WWV, and inject them into the mic plug (in parallel to the  
mic) or use a small speaker.
That together with a clap-board start should enable any frame to be  
timed.
cheers, Neville Michie


On 11/05/2009, at 3:48 AM, 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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