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Re: [Discuss-gnuradio] Fresh NTSC samples needed

From: Prateek Dayal
Subject: Re: [Discuss-gnuradio] Fresh NTSC samples needed
Date: Wed, 30 Mar 2005 00:24:45 -0800


I think that the color bars should help ... specially since we know what
to expect. A capture of a soap or something makes a nice demonstration

When Eric gave me the samples, he took the tuner output at 5.75 Mhz
(center of the 6 Mhz band) and then quadrature sampled it. Therefore in
the final samples, the video carrier was at -2.75 Mhz, Audio carrier at
1.75 Mhz. I think you get the picture.

Please capture may be a sec of video using a test signal generator and a
sec of video showing some program. The color bars that Krzysztof pointed
should help. Otherwise anything you can generate; as long as I know what
they should look like :-)



On Tue, 29 Mar 2005 13:54:42 -0700 (MST), address@hidden
<address@hidden> wrote:
> Would it be helpful to capture NTSC color bars or other test signals?
> I have an USRP and TEK signal generator.
> Where is 0Hz IF when you capture video?
> On Tue, 29 Mar 2005, Prateek Dayal wrote:
> > Hi,
> >
> > I am testing my NTSC color decoding algorithm currently. The problem
> > that I am facing is that the NTSC samples that I have downloaded from
> > comsec.... have only a text message displayed on the screen, so it is
> > very dificult to make out if the colors that I am getting make any
> > sense or not.
> >
> > It would be very very helpful if someone could cut about 2 seconds of
> > video with some humans or something in it so that I can make some
> > sense out of the image or colors.
> >
> > Please help me out ....
> >
> > Regards
> >
> >

Prateek Dayal
B.Tech 4th Year
IIT Guwahati


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