> > The project is a teletext data encoder which takes an existing video
stream,
> > extracts the sync pulses, calculates when and where to place the data,
and

> Oh, so it isn't 6.9 Mbps continuous.  How many scan lines in the video
> frame need to be encoded?  How much actual data is there per line?

Hi Eric,

I'm using the 625 line version (525 version is slightly different)
There are 45 bytes ( 360 bits ) per line. The data is just clocked out bit
by bit, no start, stop or parity bits.

1 page takes a minimum of 24 lines to send, so the more lines I use the
merrier, but 1 would suffice. There are 18 lines per field available for
teletext, but you could in theory fill the whole image with teletext data.
So as for how many lines I would like to use, the answer is just... as many
as I can.

I'm thinking of sticking all this up on a web site if anyones intersted.

Jon Baker

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