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From: siri@otc.otca.oz (Siri Hewa)
Newsgroups: comp.graphics.visualization,comp.graphics,alt.graphics
Subject: Re: Computer to VCR
Message-ID: <2800@otc.otca.oz>
Date: 2 Jun 91 22:48:02 GMT
References: <1991May30.072153.17869@sbcs.sunysb.edu> <1991May30.084541.1@happy.colorado.edu> <1991May31.100040@viz.anu.edu.au>
Reply-To: siri@otc.research.otca.oz.au (Siri Hewa)
Organization: OTC Development Unit, Australia
Lines: 24

>
>PS anyone, correct me if I'm wrong, I just going through all this
>myself.  Anyone care to explain the difference between a sync signal
>and a BB (blackburst) signal.
>
>// Drew Whitehouse,                E-mail:  drw900@anusf.anu.edu.au 
>// Visualization Group,            Fax   : +61 (0)6 247 3425 
>// Australian National University, Phone : +61 (0)6 249 5985
>// Supercomputer Facility.
>// GPO Box 4, Canberra ACT Australia 2601.

BB signal is as it indicated,Black composite signal with no Luminance, and
Chroma signal.
You need this signal for Genlock if there is no internal SPG (Sync Pulse
Genarater).What it does is take the subcarrier/ Horizonatal Phase relation to
derive the required sync,and phase values. I try to explain this simply as I
could, but it is not easy to explain how Pal signal is constructed with few
lines.
BB signal got subcarrier as well.
But sync signal may not have subcarrier signal.

Siri Hewa.
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