54255

神经网络昆斯林的新闻组分类2006

Newsgroups: sci.electronics
Path: cantaloupe.srv.cs.cmu.edu!rochester!udel!wupost!cs.utexas.edu!utnut!torn!uunet.ca!imax!dave
From: [e-mail] (Dave Martindale)
Subject: Re: NTSC horiz & vert drive from black burst?
Message-ID: <[e-mail]>
Keywords: video 
Organization: Imax Corporation, Mississauga Canada
References: <[e-mail]>
Date: Mon, 26 Apr 1993 16:43:19 GMT
Lines: 21

[e-mail] (Jack Powers) writes:
>I would like to hook up some cameras that were recently donated to our
>local community cable TV station which have sync inputs in the form
>of horizontal and vertical drive. Our station sync is a black burst
>which works fine with other boxes with "genlock" style inputs. Can
>anyone point me at a design, article, or whatever showing how to produce
>the horizontal & vertical drive signals?

Check the station's master sync generator.  You'll probably find that
it already has horizontal and vertical drive outputs that just aren't
being used.  A couple of cables and you're in business.

Another possibility is to find a genlockable sync generator with HD and VD
outputs - genlock it to station sync, and then feed HD and VD to the
cameras.

If neither of these is possible, then you'll have to build a sync
separator.  Look at the circuit diagrams of your existing sync generators -
they probably all include circuitry that does what you want.

	Dave