On Tue, 20 Jun 2000 12:55:05 +0200, you 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
Depending on the baudrate you need, you may be able to use a really
crude 2-tone system, with encoding and decoding mostly in software.=20