[time-nuts] GPS->audio interface

[Bruce Griffiths]

Brooke

The KIWI-OSD is no longer available.
However some circuit detail is available at:
http://spiff.rit.edu/richmond/ritobs/kiwi/kiwi.html

It really should be reworked to use a more reliable time source such as
a GPS timing receiver.

Bruce

Brooke Clarke wrote:
> 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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