Xref: utzoo rec.video:21292 sci.electronics:20674
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From: siri@otc.otca.oz (Siri Hewa)
Newsgroups: rec.video,sci.electronics
Subject: Re: RGBS -> Y/C
Message-ID: <2829@otc.otca.oz>
Date: 6 Jun 91 00:11:59 GMT
References: <13965@pasteur.Berkeley.EDU> <1862@vidiot.UUCP>
Reply-To: siri@otc.research.otca.oz.au (Siri Hewa)
Organization: OTC Development Unit, Australia
Lines: 43

>
>|In article <13965@pasteur.Berkeley.EDU> anantha@zabriskie.berkeley.edu (Anantha Chandrakasan) writes:
><
>|<Does anyone know of a chip or chips that will take analog RGB and S (sync)
>|<signals and convert it into Y (with sync encoded) and C signals. I want to
>|<record the RGBS video signal on a S-VHS recorder.
>
>|WARNING: Unless the RGB signal is NTSC compatible with regards to the frame
>|rates, you will not be able to record the output.  All other RBG frame rates
>|MUST be sent through a RGB to NTSC converter.  The only RGB that was even
>|close to NTSC was the IBM CGA standard.  All analog RGB rates that I know of
>|are not NTSC compatible.

Iam sorry to say, this person don't have any theoratical or practical knowledge
of the video signal. You can't say that All analogue RGB rates are not NTSC
compatible, Analogue RGB in video world, ie Broadcast and Domestic is One volt
p-p, NTSC, is 60 Hz, and 525 lines. Pal is 50 Hz, and 625 lines. And no more
crap.
Now you can get into Computer domain, with TTL and Linear RGB (Analogue).These
days computers get there Hi-Res from incresing scan rates.
For your video NTSC is 15.75 KHZ, and Pal is 16.625 KHZ.
But for the computer scan rate can start from 17.75 KHz to 64 KHz and more. And
from that you can derive the screen resolution. So different resolutions come
from different scan rates, and this is not the only way of doing things, and
there are other methods as well.
>
>|The exception is the Amiga series of computers.  Those were designed for video
>|work in mind.  So you can purchase all kinds of various boards and external
>|options for getting NTSC output in composite or S-video.
>
>|But the IBM-PC compatible and Sun Workstation RGB outputs are not NTSC rated.

You are right here. But Don't confuse this with normal video signal.

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Siri Hewa.
Network Research and Development
|||| OTC ||
Australia.