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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