Re: Recording digital data to analog tape... revisited
From: H. Peter Anvin (hpa_at_terminus.zytor.com)
Date: 10/16/04
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Date: Sat, 16 Oct 2004 00:58:18 +0000 (UTC)
Followup to: <pan.2004.10.15.22.46.14.980141@example.net>
By author: Rich Grise <rich@example.net>
In newsgroup: comp.arch.embedded
>
> On Fri, 15 Oct 2004 13:54:58 -0500, Dave VanHorn wrote:
>
> > IIRC nasa does something like this, with a data stream on a couple of lines
> > of the video. They float it across the screen, so that it never consistently
> > obscures any part of the screen. Looks reasonable to encode, but decoding
> > could be a bear.
>
> Problem is, he doesn't have access to the raw video.
>
> But I been thinkin' - a freaking submarine has got to be a pretty
> high-budget project, wouldn't you think? I think it'd be worth it to hack
> into the stupid camera, and probe it, and figure out where to inject the
> danged telemetry signal on top of the video. It will be only one point,
> after all. You might want to pick up sync, so two. Not counting ground.
> Well, you get the idea. :-)
>
The nice thing with using the audio tracks presumably is that the
telemetry and picture get synchronized. Otherwise I'd say use
solid-state storage... much more reliable.
These days, if I'd do something similar I'd use a (good) webcam and
record everything including video to hard disk.
-hpa
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