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From: GiveMeL on 10 Jun 2010 21:59
"By this statement you have no idea of what can or can not be done. "

I don't - that's why I'm asking. Looks like you don't know much about
it either?

From: Glenn Gundlach on 10 Jun 2010 22:33
On Jun 10, 6:59 pm, GiveMeL <pete.bergl...(a)gmail.com> wrote:
> "By this statement you have no idea of what can or can not be done.
"
>
> I don't -  that's why I'm asking. Looks like you don't know much
about
> it either?

He knows enough to know you can't make an apple pie using tomatoes.
What he's trying to tell you is the sample rate is based on sync
pulses, a specific number of samples per line, lines per frame, frames
per second. To just see the video card as a high speed A-D converter
ignores all the other tasks that neeed to be taken care of.

G²
From: hamilton on 11 Jun 2010 01:06
On 6/10/2010 8:33 PM, Glenn Gundlach wrote:
> On Jun 10, 6:59 pm, GiveMeL<pete.bergl...(a)gmail.com> wrote:
> > "By this statement you have no idea of what can or can not be done.
> "
> >
> > I don't - that's why I'm asking. Looks like you don't know much
> about
> > it either?
>
> He knows enough to know you can't make an apple pie using tomatoes.
> What he's trying to tell you is the sample rate is based on sync
> pulses, a specific number of samples per line, lines per frame, frames
> per second. To just see the video card as a high speed A-D converter
> ignores all the other tasks that neeed to be taken care of.
>
> G�


Thanks G2


From: Paul Keinanen on 11 Jun 2010 03:29
On Thu, 10 Jun 2010 14:57:16 -0700 (PDT), GiveMeL
<pete.berglund(a)gmail.com> wrote:

>I was wondering if anybody has tried using a cheap video capture card
>as a (cheap) scope?
>
>Any pointers?

Take an old (20 kHz) stereo audio PCM adapter sampling at 44.05594 kHz
and it will generate a valid looking video signal that can be recorded
on a standard video (cassette) recorder. Each video line contains
three samples from the left channel and three samples from the right
channel.

Instead of the VCR, you can connect the PCM adapter video output to
your video card, which should handle it properly, since there are
proper synch pulses :-).

Of course, the bandwidth is only 20 kHz and you have to dig out the
PCM bit stream from the video stream and then convert the bit stream
to integer values after parity checks.

From: J.A. Legris on 11 Jun 2010 09:10
On Jun 10, 5:57 pm, GiveMeL <pete.bergl...(a)gmail.com> wrote:
> I was wondering if anybody has tried using a cheap video capture card
> as a (cheap) scope?
>
> Any pointers?
>
> TIA!
>
> P.

This brings back memories of trying to record video on an audio
cassette recorder when I was a kid. On playback the T.V. actually
sync'ed up with what was left of the vertical sync, but the
horizontal was a complete mess. The only way to discern the "image"
was to watch the original program and then convince yourself that the
maelstrom on the screen bore some resemblance. Kind of like a
Rorschach test.

Then I learned something about electronics.

--
Joe
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