[time-nuts] GPS->audio interface

[Magnus Danielson]

Lux, James P skrev:
> 
> 
> On 5/10/09 12:15 PM, "Brooke Clarke" <brooke at pacific.net> 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
> 
> Yes, but that requires getting access to the video stream, which isn't easy
> in a "camcorder" environment.  Separate video recorders actually cost more
> than camcorders.

What precision of anything do you need?

Expect 50-100 ppm oscillators in there.

Recorded material is compressed. Consider how that affects your readout.
Recorded material is said progressive/interlaced. This may not reflect 
how the CCD is snapshot and readout. You may not have the expected 1125 
or 750 lines per frame, and exactly what frame rate do you have?

Cheers,
Magnus