Jan,

OK if you are already set on this direction, but, you might also consider
another alternative.
What you want to do sound similar to TeleText broadcasting, which uses the
first few lines of the video signal in order to encode digital data, some
of the data into each of the frames. In your case it would be synchronized
with the frames that come from the camera.

Chaipi

At 12:55 20/06/00 +0200, Jan Lund wrote:
>Hello List.
>
>I want to record some serial data on a VCR audiotrack. The idea is to record
>video from a surveillance camera and add information on the audiotrack.
>Then, at playback, route the data from the audiotrack through an OSD chip
>(STV5730) and display the data on screen.
>
>I want to keep the original video signal, without any overlay, thats why i
>want ot record the data on the audio track.
>
>I guess a data rate around 1200bps would be sufficient.
>
>Does anyone have any ideas of how to make this ?
>
>(i thought i could use an old modem chip, but i cant find any)
>
>Rgds
>
>Jan